mirror of
git://sourceware.org/git/lvm2.git
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fcbef05aae
Hmm rpmlint suggest fsf is using a different address these days, so lets keep it up-to-date
2368 lines
56 KiB
C
2368 lines
56 KiB
C
/*
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* Copyright (C) 2015 Red Hat, Inc. All rights reserved.
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*
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* This file is part of the device-mapper userspace tools.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "dmlib.h"
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#include "math.h" /* log10() */
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#define DM_STATS_REGION_NOT_PRESENT UINT64_MAX
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#define NSEC_PER_USEC 1000L
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#define NSEC_PER_MSEC 1000000L
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#define NSEC_PER_SEC 1000000000L
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#define PRECISE_ARG "precise_timestamps"
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#define HISTOGRAM_ARG "histogram:"
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/* Histogram bin */
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struct dm_histogram_bin {
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uint64_t upper; /* Upper bound on this bin. */
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uint64_t count; /* Count value for this bin. */
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};
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struct dm_histogram {
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/* The stats handle this histogram belongs to. */
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const struct dm_stats *dms;
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/* The region this histogram belongs to. */
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const struct dm_stats_region *region;
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uint64_t sum; /* Sum of histogram bin counts. */
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int nr_bins; /* Number of histogram bins assigned. */
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struct dm_histogram_bin bins[0];
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};
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/*
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* See Documentation/device-mapper/statistics.txt for full descriptions
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* of the device-mapper statistics counter fields.
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*/
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struct dm_stats_counters {
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uint64_t reads; /* Num reads completed */
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uint64_t reads_merged; /* Num reads merged */
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uint64_t read_sectors; /* Num sectors read */
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uint64_t read_nsecs; /* Num milliseconds spent reading */
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uint64_t writes; /* Num writes completed */
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uint64_t writes_merged; /* Num writes merged */
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uint64_t write_sectors; /* Num sectors written */
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uint64_t write_nsecs; /* Num milliseconds spent writing */
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uint64_t io_in_progress; /* Num I/Os currently in progress */
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uint64_t io_nsecs; /* Num milliseconds spent doing I/Os */
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uint64_t weighted_io_nsecs; /* Weighted num milliseconds doing I/Os */
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uint64_t total_read_nsecs; /* Total time spent reading in milliseconds */
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uint64_t total_write_nsecs; /* Total time spent writing in milliseconds */
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struct dm_histogram *histogram; /* Histogram. */
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};
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struct dm_stats_region {
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uint64_t region_id; /* as returned by @stats_list */
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uint64_t start;
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uint64_t len;
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uint64_t step;
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char *program_id;
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char *aux_data;
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uint64_t timescale; /* precise_timestamps is per-region */
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struct dm_histogram *bounds; /* histogram configuration */
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struct dm_stats_counters *counters;
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};
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struct dm_stats {
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/* device binding */
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int major; /* device major that this dm_stats object is bound to */
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int minor; /* device minor that this dm_stats object is bound to */
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char *name; /* device-mapper device name */
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char *uuid; /* device-mapper UUID */
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char *program_id; /* default program_id for this handle */
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struct dm_pool *mem; /* memory pool for region and counter tables */
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struct dm_pool *hist_mem; /* separate pool for histogram tables */
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uint64_t nr_regions; /* total number of present regions */
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uint64_t max_region; /* size of the regions table */
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uint64_t interval_ns; /* sampling interval in nanoseconds */
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uint64_t timescale; /* default sample value multiplier */
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int precise; /* use precise_timestamps when creating regions */
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struct dm_stats_region *regions;
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/* statistics cursor */
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uint64_t cur_region;
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uint64_t cur_area;
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};
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#define PROC_SELF_COMM "/proc/self/comm"
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static char *_program_id_from_proc(void)
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{
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FILE *comm = NULL;
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char buf[256];
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if (!(comm = fopen(PROC_SELF_COMM, "r")))
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return_NULL;
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if (!fgets(buf, sizeof(buf), comm)) {
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log_error("Could not read from %s", PROC_SELF_COMM);
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if (fclose(comm))
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stack;
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return NULL;
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}
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if (fclose(comm))
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stack;
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return dm_strdup(buf);
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}
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static uint64_t _nr_areas(uint64_t len, uint64_t step)
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{
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/* Default is one area. */
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if (!len || !step)
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return 1;
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/*
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* drivers/md/dm-stats.c::message_stats_create()
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* A region may be sub-divided into areas with their own counters.
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* Any partial area at the end of the region is treated as an
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* additional complete area.
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*/
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return (len + step - 1) / step;
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}
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static uint64_t _nr_areas_region(struct dm_stats_region *region)
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{
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return _nr_areas(region->len, region->step);
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}
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struct dm_stats *dm_stats_create(const char *program_id)
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{
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size_t hist_hint = sizeof(struct dm_histogram_bin);
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struct dm_stats *dms = NULL;
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if (!(dms = dm_zalloc(sizeof(*dms))))
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return_NULL;
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/* FIXME: better hint. */
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if (!(dms->mem = dm_pool_create("stats_pool", 4096))) {
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dm_free(dms);
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return_NULL;
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}
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if (!(dms->hist_mem = dm_pool_create("histogram_pool", hist_hint)))
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goto_bad;
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if (!program_id || !strlen(program_id))
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dms->program_id = _program_id_from_proc();
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else
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dms->program_id = dm_strdup(program_id);
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if (!dms->program_id) {
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dm_pool_destroy(dms->hist_mem);
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goto_bad;
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}
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dms->major = -1;
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dms->minor = -1;
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dms->name = NULL;
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dms->uuid = NULL;
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/* by default all regions use msec precision */
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dms->timescale = NSEC_PER_MSEC;
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dms->precise = 0;
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dms->nr_regions = DM_STATS_REGION_NOT_PRESENT;
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dms->max_region = DM_STATS_REGION_NOT_PRESENT;
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dms->regions = NULL;
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return dms;
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bad:
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dm_pool_destroy(dms->mem);
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dm_free(dms);
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return NULL;
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}
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/**
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* Test whether the stats region pointed to by region is present.
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*/
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static int _stats_region_present(const struct dm_stats_region *region)
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{
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return !(region->region_id == DM_STATS_REGION_NOT_PRESENT);
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}
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static void _stats_histograms_destroy(struct dm_pool *mem,
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struct dm_stats_region *region)
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{
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/* Unpopulated handle. */
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if (!region->counters)
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return;
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/*
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* Free everything in the pool back to the first histogram.
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*/
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if (region->counters[0].histogram)
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dm_pool_free(mem, region->counters[0].histogram);
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}
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static void _stats_region_destroy(struct dm_stats_region *region)
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{
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if (!_stats_region_present(region))
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return;
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/**
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* Don't free counters here explicitly; it will be dropped
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* from the pool along with the corresponding regions table.
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*
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* The following objects are all allocated with dm_malloc.
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*/
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if (region->program_id)
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dm_free(region->program_id);
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if (region->aux_data)
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dm_free(region->aux_data);
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}
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static void _stats_regions_destroy(struct dm_stats *dms)
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{
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struct dm_pool *mem = dms->mem;
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uint64_t i;
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if (!dms->regions)
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return;
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/* walk backwards to obey pool order */
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for (i = dms->max_region; (i != DM_STATS_REGION_NOT_PRESENT); i--) {
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_stats_histograms_destroy(dms->hist_mem, &dms->regions[i]);
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_stats_region_destroy(&dms->regions[i]);
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}
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dm_pool_free(mem, dms->regions);
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}
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static int _set_stats_device(struct dm_stats *dms, struct dm_task *dmt)
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{
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if (dms->name)
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return dm_task_set_name(dmt, dms->name);
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if (dms->uuid)
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return dm_task_set_uuid(dmt, dms->uuid);
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if (dms->major > 0)
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return dm_task_set_major(dmt, dms->major)
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&& dm_task_set_minor(dmt, dms->minor);
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return_0;
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}
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static int _stats_bound(struct dm_stats *dms)
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{
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if (dms->major > 0 || dms->name || dms->uuid)
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return 1;
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/* %p format specifier expects a void pointer. */
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log_debug("Stats handle at %p is not bound.", (void *) dms);
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return 0;
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}
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static void _stats_clear_binding(struct dm_stats *dms)
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{
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if (dms->name)
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dm_pool_free(dms->mem, dms->name);
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if (dms->uuid)
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dm_pool_free(dms->mem, dms->uuid);
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dms->name = dms->uuid = NULL;
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dms->major = dms->minor = -1;
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}
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int dm_stats_bind_devno(struct dm_stats *dms, int major, int minor)
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{
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_stats_clear_binding(dms);
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_stats_regions_destroy(dms);
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dms->major = major;
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dms->minor = minor;
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return 1;
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}
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int dm_stats_bind_name(struct dm_stats *dms, const char *name)
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{
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_stats_clear_binding(dms);
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_stats_regions_destroy(dms);
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if (!(dms->name = dm_pool_strdup(dms->mem, name)))
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return_0;
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return 1;
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}
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int dm_stats_bind_uuid(struct dm_stats *dms, const char *uuid)
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{
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_stats_clear_binding(dms);
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_stats_regions_destroy(dms);
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if (!(dms->uuid = dm_pool_strdup(dms->mem, uuid)))
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return_0;
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return 1;
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}
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static int _stats_check_precise_timestamps(const struct dm_stats *dms)
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{
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/* Already checked? */
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if (dms && dms->precise)
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return 1;
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return dm_message_supports_precise_timestamps();
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}
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int dm_stats_driver_supports_precise(void)
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{
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return _stats_check_precise_timestamps(NULL);
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}
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int dm_stats_driver_supports_histogram(void)
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{
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return _stats_check_precise_timestamps(NULL);
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}
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static int _fill_hist_arg(char *hist_arg, size_t hist_len, uint64_t scale,
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struct dm_histogram *bounds)
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{
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int i, l, len = 0, nr_bins;
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char *arg = hist_arg;
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uint64_t value;
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nr_bins = bounds->nr_bins;
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for (i = 0; i < nr_bins; i++) {
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value = bounds->bins[i].upper / scale;
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if ((l = dm_snprintf(arg, hist_len - len, FMTu64"%s", value,
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(i == (nr_bins - 1)) ? "" : ",")) < 0)
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return_0;
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len += l;
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arg += l;
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}
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return 1;
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}
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static void *_get_hist_arg(struct dm_histogram *bounds, uint64_t scale,
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size_t *len)
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{
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struct dm_histogram_bin *entry, *bins;
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size_t hist_len = 1; /* terminating '\0' */
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double value;
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entry = bins = bounds->bins;
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entry += bounds->nr_bins - 1;
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while(entry >= bins) {
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value = (double) (entry--)->upper;
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/* Use lround to avoid size_t -> double cast warning. */
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hist_len += 1 + (size_t) lround(log10(value / scale));
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if (entry != bins)
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hist_len++; /* ',' */
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}
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*len = hist_len;
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return dm_zalloc(hist_len);
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}
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static char *_build_histogram_arg(struct dm_histogram *bounds, int *precise)
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{
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struct dm_histogram_bin *entry, *bins;
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size_t hist_len;
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char *hist_arg;
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uint64_t scale;
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entry = bins = bounds->bins;
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/* Empty histogram is invalid. */
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if (!bounds->nr_bins) {
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log_error("Cannot format empty histogram description.");
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return NULL;
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}
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/* Validate entries and set *precise if precision < 1ms. */
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entry += bounds->nr_bins - 1;
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while (entry >= bins) {
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if (entry != bins) {
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if (entry->upper < (entry - 1)->upper) {
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log_error("Histogram boundaries must be in "
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"order of increasing magnitude.");
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return 0;
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}
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}
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/*
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* Only enable precise_timestamps automatically if any
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* value in the histogram bounds uses precision < 1ms.
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*/
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if (((entry--)->upper % NSEC_PER_MSEC) && !*precise)
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*precise = 1;
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}
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scale = (*precise) ? 1 : NSEC_PER_MSEC;
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|
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/* Calculate hist_len and allocate a character buffer. */
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if (!(hist_arg = _get_hist_arg(bounds, scale, &hist_len))) {
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log_error("Could not allocate memory for histogram argument.");
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return 0;
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}
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|
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/* Fill hist_arg with boundary strings. */
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if (!_fill_hist_arg(hist_arg, hist_len, scale, bounds))
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goto_bad;
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return hist_arg;
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|
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bad:
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log_error("Could not build histogram arguments.");
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dm_free(hist_arg);
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|
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return NULL;
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}
|
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|
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static struct dm_task *_stats_send_message(struct dm_stats *dms, char *msg)
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{
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struct dm_task *dmt;
|
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|
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if (!(dmt = dm_task_create(DM_DEVICE_TARGET_MSG)))
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return_0;
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|
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if (!_set_stats_device(dms, dmt))
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goto_bad;
|
|
|
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if (!dm_task_set_message(dmt, msg))
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goto_bad;
|
|
|
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if (!dm_task_run(dmt))
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goto_bad;
|
|
|
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return dmt;
|
|
|
|
bad:
|
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dm_task_destroy(dmt);
|
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return NULL;
|
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}
|
|
|
|
/*
|
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* Parse a histogram specification returned by the kernel in a
|
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* @stats_list response.
|
|
*/
|
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static int _stats_parse_histogram_spec(struct dm_stats *dms,
|
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struct dm_stats_region *region,
|
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const char *histogram)
|
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{
|
|
static const char *_valid_chars = "0123456789,";
|
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uint64_t scale = region->timescale, this_val = 0;
|
|
struct dm_pool *mem = dms->hist_mem;
|
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struct dm_histogram_bin cur;
|
|
struct dm_histogram hist;
|
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int nr_bins = 1;
|
|
const char *c, *v, *val_start;
|
|
char *p, *endptr = NULL;
|
|
|
|
/* Advance past "histogram:". */
|
|
histogram = strchr(histogram, ':');
|
|
if (!histogram) {
|
|
log_error("Could not parse histogram description.");
|
|
return 0;
|
|
}
|
|
histogram++;
|
|
|
|
/* @stats_list rows are newline terminated. */
|
|
if ((p = strchr(histogram, '\n')))
|
|
*p = '\0';
|
|
|
|
if (!dm_pool_begin_object(mem, sizeof(cur)))
|
|
return_0;
|
|
|
|
memset(&hist, 0, sizeof(hist));
|
|
|
|
hist.nr_bins = 0; /* fix later */
|
|
hist.region = region;
|
|
hist.dms = dms;
|
|
|
|
if (!dm_pool_grow_object(mem, &hist, sizeof(hist)))
|
|
goto_bad;
|
|
|
|
c = histogram;
|
|
do {
|
|
for (v = _valid_chars; *v; v++)
|
|
if (*c == *v)
|
|
break;
|
|
if (!*v) {
|
|
stack;
|
|
goto badchar;
|
|
}
|
|
|
|
if (*c == ',') {
|
|
log_error("Invalid histogram description: %s",
|
|
histogram);
|
|
goto bad;
|
|
} else {
|
|
val_start = c;
|
|
endptr = NULL;
|
|
|
|
this_val = strtoull(val_start, &endptr, 10);
|
|
if (!endptr) {
|
|
log_error("Could not parse histogram boundary.");
|
|
goto bad;
|
|
}
|
|
|
|
c = endptr; /* Advance to units, comma, or end. */
|
|
|
|
if (*c == ',')
|
|
c++;
|
|
else if (*c || (*c == ' ')) { /* Expected ',' or NULL. */
|
|
stack;
|
|
goto badchar;
|
|
}
|
|
|
|
if (*c == ',')
|
|
c++;
|
|
|
|
cur.upper = scale * this_val;
|
|
cur.count = 0;
|
|
|
|
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
|
|
goto_bad;
|
|
|
|
nr_bins++;
|
|
}
|
|
} while (*c && (*c != ' '));
|
|
|
|
/* final upper bound. */
|
|
cur.upper = UINT64_MAX;
|
|
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
|
|
goto_bad;
|
|
|
|
region->bounds = dm_pool_end_object(mem);
|
|
|
|
if (!region->bounds)
|
|
return_0;
|
|
|
|
region->bounds->nr_bins = nr_bins;
|
|
|
|
log_debug("Added region histogram spec with %d entries.", nr_bins);
|
|
return 1;
|
|
|
|
badchar:
|
|
log_error("Invalid character in histogram: '%c' (0x%x)", *c, *c);
|
|
bad:
|
|
dm_pool_abandon_object(mem);
|
|
return 0;
|
|
}
|
|
|
|
static int _stats_parse_list_region(struct dm_stats *dms,
|
|
struct dm_stats_region *region, char *line)
|
|
{
|
|
char *p = NULL, string_data[4096]; /* FIXME: add dm_sscanf with %ms? */
|
|
const char *program_id, *aux_data, *stats_args;
|
|
const char *empty_string = "";
|
|
int r;
|
|
|
|
memset(string_data, 0, sizeof(string_data));
|
|
|
|
/*
|
|
* Parse fixed fields, line format:
|
|
*
|
|
* <region_id>: <start_sector>+<length> <step> <string data>
|
|
*
|
|
* Maximum string data size is 4096 - 1 bytes.
|
|
*/
|
|
r = sscanf(line, FMTu64 ": " FMTu64 "+" FMTu64 " " FMTu64 " %4095c",
|
|
®ion->region_id, ®ion->start, ®ion->len,
|
|
®ion->step, string_data);
|
|
|
|
if (r != 5)
|
|
return_0;
|
|
|
|
/* program_id is guaranteed to be first. */
|
|
program_id = string_data;
|
|
|
|
/*
|
|
* FIXME: support embedded '\ ' in string data:
|
|
* s/strchr/_find_unescaped_space()/
|
|
*/
|
|
if ((p = strchr(string_data, ' '))) {
|
|
/* terminate program_id string. */
|
|
*p = '\0';
|
|
if (!strcmp(program_id, "-"))
|
|
program_id = empty_string;
|
|
aux_data = p + 1;
|
|
if ((p = strchr(aux_data, ' '))) {
|
|
/* terminate aux_data string. */
|
|
*p = '\0';
|
|
if (!strcmp(aux_data, "-"))
|
|
aux_data = empty_string;
|
|
stats_args = p + 1;
|
|
} else
|
|
stats_args = empty_string;
|
|
} else
|
|
aux_data = stats_args = empty_string;
|
|
|
|
if (strstr(stats_args, PRECISE_ARG))
|
|
region->timescale = 1;
|
|
else
|
|
region->timescale = NSEC_PER_MSEC;
|
|
|
|
if ((p = strstr(stats_args, HISTOGRAM_ARG))) {
|
|
if (!_stats_parse_histogram_spec(dms, region, p))
|
|
return_0;
|
|
} else
|
|
region->bounds = NULL;
|
|
|
|
if (!(region->program_id = dm_strdup(program_id)))
|
|
return_0;
|
|
if (!(region->aux_data = dm_strdup(aux_data))) {
|
|
dm_free(region->program_id);
|
|
return_0;
|
|
}
|
|
|
|
region->counters = NULL;
|
|
return 1;
|
|
}
|
|
|
|
static int _stats_parse_list(struct dm_stats *dms, const char *resp)
|
|
{
|
|
uint64_t max_region = 0, nr_regions = 0;
|
|
struct dm_stats_region cur, fill;
|
|
struct dm_pool *mem = dms->mem;
|
|
FILE *list_rows;
|
|
/* FIXME: use correct maximum line length for kernel format */
|
|
char line[256];
|
|
|
|
if (!resp) {
|
|
log_error("Could not parse NULL @stats_list response.");
|
|
return 0;
|
|
}
|
|
|
|
if (dms->regions)
|
|
_stats_regions_destroy(dms);
|
|
|
|
/* no regions */
|
|
if (!strlen(resp)) {
|
|
dms->nr_regions = dms->max_region = 0;
|
|
dms->regions = NULL;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* dm_task_get_message_response() returns a 'const char *' but
|
|
* since fmemopen also permits "w" it expects a 'char *'.
|
|
*/
|
|
if (!(list_rows = fmemopen((char *)resp, strlen(resp), "r")))
|
|
return_0;
|
|
|
|
if (!dm_pool_begin_object(mem, 1024))
|
|
goto_bad;
|
|
|
|
while(fgets(line, sizeof(line), list_rows)) {
|
|
|
|
if (!_stats_parse_list_region(dms, &cur, line))
|
|
goto_bad;
|
|
|
|
/* handle holes in the list of region_ids */
|
|
if (cur.region_id > max_region) {
|
|
memset(&fill, 0, sizeof(fill));
|
|
fill.region_id = DM_STATS_REGION_NOT_PRESENT;
|
|
do {
|
|
if (!dm_pool_grow_object(mem, &fill, sizeof(fill)))
|
|
goto_bad;
|
|
} while (max_region++ < (cur.region_id - 1));
|
|
}
|
|
|
|
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
|
|
goto_bad;
|
|
|
|
max_region++;
|
|
nr_regions++;
|
|
}
|
|
|
|
dms->nr_regions = nr_regions;
|
|
dms->max_region = max_region - 1;
|
|
dms->regions = dm_pool_end_object(mem);
|
|
|
|
if (fclose(list_rows))
|
|
stack;
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
if (fclose(list_rows))
|
|
stack;
|
|
dm_pool_abandon_object(mem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_stats_list(struct dm_stats *dms, const char *program_id)
|
|
{
|
|
struct dm_task *dmt;
|
|
char msg[256];
|
|
int r;
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
/* allow zero-length program_id for list */
|
|
if (!program_id)
|
|
program_id = dms->program_id;
|
|
|
|
r = dm_snprintf(msg, sizeof(msg), "@stats_list %s", program_id);
|
|
|
|
if (r < 0) {
|
|
log_error("Failed to prepare stats message.");
|
|
return 0;
|
|
}
|
|
|
|
if (!(dmt = _stats_send_message(dms, msg)))
|
|
return_0;
|
|
|
|
if (!_stats_parse_list(dms, dm_task_get_message_response(dmt))) {
|
|
log_error("Could not parse @stats_list response.");
|
|
goto bad;
|
|
}
|
|
|
|
dm_task_destroy(dmt);
|
|
return 1;
|
|
|
|
bad:
|
|
dm_task_destroy(dmt);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Parse histogram data returned from a @stats_print operation.
|
|
*/
|
|
static int _stats_parse_histogram(struct dm_pool *mem, char *hist_str,
|
|
struct dm_histogram **histogram,
|
|
struct dm_stats_region *region)
|
|
{
|
|
struct dm_histogram hist, *bounds = region->bounds;
|
|
static const char *_valid_chars = "0123456789:";
|
|
int nr_bins = region->bounds->nr_bins;
|
|
const char *c, *v, *val_start;
|
|
struct dm_histogram_bin cur;
|
|
uint64_t sum = 0, this_val;
|
|
char *endptr = NULL;
|
|
int bin = 0;
|
|
|
|
c = hist_str;
|
|
|
|
if (!dm_pool_begin_object(mem, sizeof(cur)))
|
|
return_0;
|
|
|
|
hist.nr_bins = nr_bins;
|
|
|
|
if (!dm_pool_grow_object(mem, &hist, sizeof(hist)))
|
|
goto_bad;
|
|
|
|
do {
|
|
memset(&cur, 0, sizeof(cur));
|
|
for (v = _valid_chars; *v; v++)
|
|
if (*c == *v)
|
|
break;
|
|
if (!*v)
|
|
goto badchar;
|
|
|
|
if (*c == ',')
|
|
goto badchar;
|
|
else {
|
|
val_start = c;
|
|
endptr = NULL;
|
|
|
|
this_val = strtoull(val_start, &endptr, 10);
|
|
if (!endptr) {
|
|
log_error("Could not parse histogram value.");
|
|
goto bad;
|
|
}
|
|
c = endptr; /* Advance to colon, or end. */
|
|
|
|
if (*c == ':')
|
|
c++;
|
|
else if (*c & (*c != '\n'))
|
|
/* Expected ':', '\n', or NULL. */
|
|
goto badchar;
|
|
|
|
if (*c == ':')
|
|
c++;
|
|
|
|
cur.upper = bounds->bins[bin].upper;
|
|
cur.count = this_val;
|
|
sum += this_val;
|
|
|
|
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
|
|
goto_bad;
|
|
|
|
bin++;
|
|
}
|
|
} while (*c && (*c != '\n'));
|
|
|
|
log_debug("Added region histogram data with %d entries.", nr_bins);
|
|
|
|
*histogram = dm_pool_end_object(mem);
|
|
(*histogram)->sum = sum;
|
|
|
|
return 1;
|
|
|
|
badchar:
|
|
log_error("Invalid character in histogram data: '%c' (0x%x)", *c, *c);
|
|
bad:
|
|
dm_pool_abandon_object(mem);
|
|
return 0;
|
|
}
|
|
|
|
static int _stats_parse_region(struct dm_stats *dms, const char *resp,
|
|
struct dm_stats_region *region,
|
|
uint64_t timescale)
|
|
{
|
|
struct dm_histogram *hist = NULL;
|
|
struct dm_pool *mem = dms->mem;
|
|
struct dm_stats_counters cur;
|
|
FILE *stats_rows = NULL;
|
|
uint64_t start = 0, len = 0;
|
|
char row[256];
|
|
int r;
|
|
|
|
if (!resp) {
|
|
log_error("Could not parse empty @stats_print response.");
|
|
return 0;
|
|
}
|
|
|
|
region->start = UINT64_MAX;
|
|
|
|
if (!dm_pool_begin_object(mem, 512))
|
|
goto_bad;
|
|
|
|
/*
|
|
* dm_task_get_message_response() returns a 'const char *' but
|
|
* since fmemopen also permits "w" it expects a 'char *'.
|
|
*/
|
|
stats_rows = fmemopen((char *)resp, strlen(resp), "r");
|
|
if (!stats_rows)
|
|
goto_bad;
|
|
|
|
/*
|
|
* Output format for each step-sized area of a region:
|
|
*
|
|
* <start_sector>+<length> counters
|
|
*
|
|
* The first 11 counters have the same meaning as
|
|
* /sys/block/ * /stat or /proc/diskstats.
|
|
*
|
|
* Please refer to Documentation/iostats.txt for details.
|
|
*
|
|
* 1. the number of reads completed
|
|
* 2. the number of reads merged
|
|
* 3. the number of sectors read
|
|
* 4. the number of milliseconds spent reading
|
|
* 5. the number of writes completed
|
|
* 6. the number of writes merged
|
|
* 7. the number of sectors written
|
|
* 8. the number of milliseconds spent writing
|
|
* 9. the number of I/Os currently in progress
|
|
* 10. the number of milliseconds spent doing I/Os
|
|
* 11. the weighted number of milliseconds spent doing I/Os
|
|
*
|
|
* Additional counters:
|
|
* 12. the total time spent reading in milliseconds
|
|
* 13. the total time spent writing in milliseconds
|
|
*
|
|
*/
|
|
while (fgets(row, sizeof(row), stats_rows)) {
|
|
r = sscanf(row, FMTu64 "+" FMTu64 /* start+len */
|
|
/* reads */
|
|
FMTu64 " " FMTu64 " " FMTu64 " " FMTu64 " "
|
|
/* writes */
|
|
FMTu64 " " FMTu64 " " FMTu64 " " FMTu64 " "
|
|
/* in flight & io nsecs */
|
|
FMTu64 " " FMTu64 " " FMTu64 " "
|
|
/* tot read/write nsecs */
|
|
FMTu64 " " FMTu64, &start, &len,
|
|
&cur.reads, &cur.reads_merged, &cur.read_sectors,
|
|
&cur.read_nsecs,
|
|
&cur.writes, &cur.writes_merged, &cur.write_sectors,
|
|
&cur.write_nsecs,
|
|
&cur.io_in_progress,
|
|
&cur.io_nsecs, &cur.weighted_io_nsecs,
|
|
&cur.total_read_nsecs, &cur.total_write_nsecs);
|
|
if (r != 15) {
|
|
log_error("Could not parse @stats_print row.");
|
|
goto bad;
|
|
}
|
|
|
|
/* scale time values up if needed */
|
|
if (timescale != 1) {
|
|
cur.read_nsecs *= timescale;
|
|
cur.write_nsecs *= timescale;
|
|
cur.io_nsecs *= timescale;
|
|
cur.weighted_io_nsecs *= timescale;
|
|
cur.total_read_nsecs *= timescale;
|
|
cur.total_write_nsecs *= timescale;
|
|
}
|
|
|
|
if (region->bounds) {
|
|
/* Find first histogram separator. */
|
|
char *hist_str = strchr(row, ':');
|
|
if (!hist_str) {
|
|
log_error("Could not parse histogram value.");
|
|
goto bad;
|
|
}
|
|
/* Find space preceding histogram. */
|
|
while (hist_str && *(hist_str - 1) != ' ')
|
|
hist_str--;
|
|
|
|
/* Use a separate pool for histogram objects since we
|
|
* are growing the area table and each area's histogram
|
|
* table simultaneously.
|
|
*/
|
|
if (!_stats_parse_histogram(dms->hist_mem, hist_str,
|
|
&hist, region))
|
|
goto_bad;
|
|
hist->dms = dms;
|
|
hist->region = region;
|
|
}
|
|
|
|
cur.histogram = hist;
|
|
|
|
if (!dm_pool_grow_object(mem, &cur, sizeof(cur)))
|
|
goto_bad;
|
|
|
|
if (region->start == UINT64_MAX) {
|
|
region->start = start;
|
|
region->step = len; /* area size is always uniform. */
|
|
}
|
|
}
|
|
|
|
region->len = (start + len) - region->start;
|
|
region->timescale = timescale;
|
|
region->counters = dm_pool_end_object(mem);
|
|
|
|
if (fclose(stats_rows))
|
|
stack;
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
if (stats_rows)
|
|
if (fclose(stats_rows))
|
|
stack;
|
|
dm_pool_abandon_object(mem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void _stats_walk_next(const struct dm_stats *dms, int region,
|
|
uint64_t *cur_r, uint64_t *cur_a)
|
|
{
|
|
struct dm_stats_region *cur = NULL;
|
|
int present;
|
|
|
|
if (!dms || !dms->regions)
|
|
return;
|
|
|
|
cur = &dms->regions[*cur_r];
|
|
present = _stats_region_present(cur);
|
|
|
|
if (region && present)
|
|
*cur_a = _nr_areas_region(cur);
|
|
|
|
if (region || !present || ++(*cur_a) == _nr_areas_region(cur)) {
|
|
*cur_a = 0;
|
|
while(!dm_stats_region_present(dms, ++(*cur_r))
|
|
&& *cur_r < dms->max_region)
|
|
; /* keep walking until a present region is found
|
|
* or the end of the table is reached. */
|
|
}
|
|
|
|
}
|
|
|
|
static void _stats_walk_start(const struct dm_stats *dms,
|
|
uint64_t *cur_r, uint64_t *cur_a)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return;
|
|
|
|
*cur_r = 0;
|
|
*cur_a = 0;
|
|
|
|
/* advance to the first present region */
|
|
if (!dm_stats_region_present(dms, dms->cur_region))
|
|
_stats_walk_next(dms, 0, cur_r, cur_a);
|
|
}
|
|
|
|
void dm_stats_walk_start(struct dm_stats *dms)
|
|
{
|
|
_stats_walk_start(dms, &dms->cur_region, &dms->cur_area);
|
|
}
|
|
|
|
void dm_stats_walk_next(struct dm_stats *dms)
|
|
{
|
|
_stats_walk_next(dms, 0, &dms->cur_region, &dms->cur_area);
|
|
}
|
|
|
|
void dm_stats_walk_next_region(struct dm_stats *dms)
|
|
{
|
|
_stats_walk_next(dms, 1, &dms->cur_region, &dms->cur_area);
|
|
}
|
|
|
|
static int _stats_walk_end(const struct dm_stats *dms,
|
|
uint64_t *cur_r, uint64_t *cur_a)
|
|
{
|
|
struct dm_stats_region *region = NULL;
|
|
int end = 0;
|
|
|
|
if (!dms || !dms->regions)
|
|
return 1;
|
|
|
|
region = &dms->regions[*cur_r];
|
|
end = (*cur_r > dms->max_region
|
|
|| (*cur_r == dms->max_region
|
|
&& *cur_a >= _nr_areas_region(region)));
|
|
|
|
return end;
|
|
}
|
|
|
|
int dm_stats_walk_end(struct dm_stats *dms)
|
|
{
|
|
return _stats_walk_end(dms, &dms->cur_region, &dms->cur_area);
|
|
}
|
|
|
|
uint64_t dm_stats_get_region_nr_areas(const struct dm_stats *dms,
|
|
uint64_t region_id)
|
|
{
|
|
struct dm_stats_region *region = &dms->regions[region_id];
|
|
return _nr_areas_region(region);
|
|
}
|
|
|
|
uint64_t dm_stats_get_current_nr_areas(const struct dm_stats *dms)
|
|
{
|
|
return dm_stats_get_region_nr_areas(dms, dms->cur_region);
|
|
}
|
|
|
|
uint64_t dm_stats_get_nr_areas(const struct dm_stats *dms)
|
|
{
|
|
uint64_t nr_areas = 0;
|
|
/* use a separate cursor */
|
|
uint64_t cur_region, cur_area;
|
|
|
|
_stats_walk_start(dms, &cur_region, &cur_area);
|
|
do {
|
|
nr_areas += dm_stats_get_current_nr_areas(dms);
|
|
_stats_walk_next(dms, 1, &cur_region, &cur_area);
|
|
} while (!_stats_walk_end(dms, &cur_region, &cur_area));
|
|
return nr_areas;
|
|
}
|
|
|
|
int dm_stats_get_region_nr_histogram_bins(const struct dm_stats *dms,
|
|
uint64_t region_id)
|
|
{
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
|
|
if (!dms->regions[region_id].bounds)
|
|
return_0;
|
|
|
|
return dms->regions[region_id].bounds->nr_bins;
|
|
}
|
|
|
|
static int _stats_create_region(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
int precise, const char *hist_arg,
|
|
const char *program_id, const char *aux_data)
|
|
{
|
|
const char *err_fmt = "Could not prepare @stats_create %s.";
|
|
const char *precise_str = PRECISE_ARG;
|
|
const char *resp, *opt_args = NULL;
|
|
char msg[1024], range[64], *endptr = NULL;
|
|
struct dm_task *dmt = NULL;
|
|
int r = 0, nr_opt = 0;
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
if (!program_id || !strlen(program_id))
|
|
program_id = dms->program_id;
|
|
|
|
if (start || len) {
|
|
if (!dm_snprintf(range, sizeof(range), FMTu64 "+" FMTu64,
|
|
start, len)) {
|
|
log_error(err_fmt, "range");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (precise < 0)
|
|
precise = dms->precise;
|
|
|
|
if (precise)
|
|
nr_opt++;
|
|
else
|
|
precise_str = "";
|
|
|
|
if (hist_arg)
|
|
nr_opt++;
|
|
else
|
|
hist_arg = "";
|
|
|
|
if (nr_opt) {
|
|
if ((dm_asprintf((char **)&opt_args, "%d %s %s%s", nr_opt,
|
|
precise_str,
|
|
(strlen(hist_arg)) ? HISTOGRAM_ARG : "",
|
|
hist_arg)) < 0) {
|
|
log_error(err_fmt, PRECISE_ARG " option.");
|
|
return 0;
|
|
}
|
|
} else
|
|
opt_args = dm_strdup("");
|
|
|
|
if (!dm_snprintf(msg, sizeof(msg), "@stats_create %s %s" FMTu64
|
|
" %s %s %s", (start || len) ? range : "-",
|
|
(step < 0) ? "/" : "",
|
|
(uint64_t)llabs(step),
|
|
opt_args, program_id, aux_data)) {
|
|
log_error(err_fmt, "message");
|
|
dm_free((void *) opt_args);
|
|
return 0;
|
|
}
|
|
|
|
if (!(dmt = _stats_send_message(dms, msg)))
|
|
goto_out;
|
|
|
|
resp = dm_task_get_message_response(dmt);
|
|
if (!resp) {
|
|
log_error("Could not parse empty @stats_create response.");
|
|
goto out;
|
|
}
|
|
|
|
if (region_id) {
|
|
*region_id = strtoull(resp, &endptr, 10);
|
|
if (resp == endptr)
|
|
goto_out;
|
|
}
|
|
|
|
r = 1;
|
|
|
|
out:
|
|
if (dmt)
|
|
dm_task_destroy(dmt);
|
|
dm_free((void *) opt_args);
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_stats_create_region(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
int precise, struct dm_histogram *bounds,
|
|
const char *program_id, const char *aux_data)
|
|
{
|
|
char *hist_arg = NULL;
|
|
int r = 0;
|
|
|
|
/* Nanosecond counters and histograms both need precise_timestamps. */
|
|
if ((precise || bounds) && !_stats_check_precise_timestamps(dms))
|
|
return_0;
|
|
|
|
if (bounds) {
|
|
/* _build_histogram_arg enables precise if vals < 1ms. */
|
|
if (!(hist_arg = _build_histogram_arg(bounds, &precise)))
|
|
goto_out;
|
|
}
|
|
|
|
r = _stats_create_region(dms, region_id, start, len, step,
|
|
precise, hist_arg, program_id, aux_data);
|
|
dm_free(hist_arg);
|
|
|
|
out:
|
|
return r;
|
|
}
|
|
|
|
int dm_stats_delete_region(struct dm_stats *dms, uint64_t region_id)
|
|
{
|
|
struct dm_task *dmt;
|
|
char msg[1024];
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
if (!dm_snprintf(msg, sizeof(msg), "@stats_delete " FMTu64, region_id)) {
|
|
log_error("Could not prepare @stats_delete message.");
|
|
return 0;
|
|
}
|
|
|
|
dmt = _stats_send_message(dms, msg);
|
|
if (!dmt)
|
|
return_0;
|
|
dm_task_destroy(dmt);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_clear_region(struct dm_stats *dms, uint64_t region_id)
|
|
{
|
|
struct dm_task *dmt;
|
|
char msg[1024];
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
if (!dm_snprintf(msg, sizeof(msg), "@stats_clear " FMTu64, region_id)) {
|
|
log_error("Could not prepare @stats_clear message.");
|
|
return 0;
|
|
}
|
|
|
|
dmt = _stats_send_message(dms, msg);
|
|
|
|
if (!dmt)
|
|
return_0;
|
|
|
|
dm_task_destroy(dmt);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct dm_task *_stats_print_region(struct dm_stats *dms,
|
|
uint64_t region_id, unsigned start_line,
|
|
unsigned num_lines, unsigned clear)
|
|
{
|
|
/* @stats_print[_clear] <region_id> [<start_line> <num_lines>] */
|
|
const char *err_fmt = "Could not prepare @stats_print %s.";
|
|
struct dm_task *dmt = NULL;
|
|
char msg[1024], lines[64];
|
|
|
|
if (start_line || num_lines)
|
|
if (!dm_snprintf(lines, sizeof(lines),
|
|
"%u %u", start_line, num_lines)) {
|
|
log_error(err_fmt, "row specification");
|
|
return NULL;
|
|
}
|
|
|
|
if (!dm_snprintf(msg, sizeof(msg), "@stats_print%s " FMTu64 " %s",
|
|
(clear) ? "_clear" : "",
|
|
region_id, (start_line || num_lines) ? lines : "")) {
|
|
log_error(err_fmt, "message");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(dmt = _stats_send_message(dms, msg)))
|
|
return_NULL;
|
|
|
|
return dmt;
|
|
}
|
|
|
|
char *dm_stats_print_region(struct dm_stats *dms, uint64_t region_id,
|
|
unsigned start_line, unsigned num_lines,
|
|
unsigned clear)
|
|
{
|
|
char *resp = NULL;
|
|
struct dm_task *dmt = NULL;
|
|
const char *response;
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
dmt = _stats_print_region(dms, region_id,
|
|
start_line, num_lines, clear);
|
|
|
|
if (!dmt)
|
|
return_0;
|
|
|
|
if (!(response = dm_task_get_message_response(dmt)))
|
|
goto_out;
|
|
|
|
if (!(resp = dm_pool_strdup(dms->mem, response)))
|
|
log_error("Could not allocate memory for response buffer.");
|
|
out:
|
|
dm_task_destroy(dmt);
|
|
|
|
return resp;
|
|
}
|
|
|
|
void dm_stats_buffer_destroy(struct dm_stats *dms, char *buffer)
|
|
{
|
|
dm_pool_free(dms->mem, buffer);
|
|
}
|
|
|
|
uint64_t dm_stats_get_nr_regions(const struct dm_stats *dms)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
return dms->nr_regions;
|
|
}
|
|
|
|
/**
|
|
* Test whether region_id is present in this set of stats data
|
|
*/
|
|
int dm_stats_region_present(const struct dm_stats *dms, uint64_t region_id)
|
|
{
|
|
if (!dms->regions)
|
|
return_0;
|
|
|
|
if (region_id > dms->max_region)
|
|
return_0;
|
|
|
|
return _stats_region_present(&dms->regions[region_id]);
|
|
}
|
|
|
|
static int _dm_stats_populate_region(struct dm_stats *dms, uint64_t region_id,
|
|
const char *resp)
|
|
{
|
|
struct dm_stats_region *region = &dms->regions[region_id];
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
if (!_stats_parse_region(dms, resp, region, region->timescale)) {
|
|
log_error("Could not parse @stats_print message response.");
|
|
return 0;
|
|
}
|
|
region->region_id = region_id;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_populate(struct dm_stats *dms, const char *program_id,
|
|
uint64_t region_id)
|
|
{
|
|
int all_regions = (region_id == DM_STATS_REGIONS_ALL);
|
|
struct dm_task *dmt = NULL; /* @stats_print task */
|
|
const char *resp;
|
|
|
|
if (!_stats_bound(dms))
|
|
return_0;
|
|
|
|
/* allow zero-length program_id for populate */
|
|
if (!program_id)
|
|
program_id = dms->program_id;
|
|
|
|
if (all_regions && !dm_stats_list(dms, program_id)) {
|
|
log_error("Could not parse @stats_list response.");
|
|
goto bad;
|
|
}
|
|
|
|
/* successful list but no regions registered */
|
|
if (!dms->nr_regions)
|
|
return_0;
|
|
|
|
dm_stats_walk_start(dms);
|
|
do {
|
|
region_id = (all_regions)
|
|
? dm_stats_get_current_region(dms) : region_id;
|
|
|
|
/* obtain all lines and clear counter values */
|
|
if (!(dmt = _stats_print_region(dms, region_id, 0, 0, 1)))
|
|
goto_bad;
|
|
|
|
resp = dm_task_get_message_response(dmt);
|
|
if (!_dm_stats_populate_region(dms, region_id, resp)) {
|
|
dm_task_destroy(dmt);
|
|
goto_bad;
|
|
}
|
|
|
|
dm_task_destroy(dmt);
|
|
dm_stats_walk_next_region(dms);
|
|
|
|
} while (all_regions && !dm_stats_walk_end(dms));
|
|
|
|
return 1;
|
|
|
|
bad:
|
|
_stats_regions_destroy(dms);
|
|
dms->regions = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* destroy a dm_stats object and all associated regions and counter sets.
|
|
*/
|
|
void dm_stats_destroy(struct dm_stats *dms)
|
|
{
|
|
_stats_regions_destroy(dms);
|
|
_stats_clear_binding(dms);
|
|
dm_pool_destroy(dms->mem);
|
|
dm_pool_destroy(dms->hist_mem);
|
|
dm_free(dms->program_id);
|
|
dm_free(dms);
|
|
}
|
|
|
|
/**
|
|
* Methods for accessing counter fields. All methods share the
|
|
* following naming scheme and prototype:
|
|
*
|
|
* uint64_t dm_stats_get_COUNTER(struct dm_stats *, uint64_t, uint64_t)
|
|
*
|
|
* Where the two integer arguments are the region_id and area_id
|
|
* respectively.
|
|
*/
|
|
#define MK_STATS_GET_COUNTER_FN(counter) \
|
|
uint64_t dm_stats_get_ ## counter(const struct dm_stats *dms, \
|
|
uint64_t region_id, uint64_t area_id) \
|
|
{ \
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT) \
|
|
? dms->cur_region : region_id ; \
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT) \
|
|
? dms->cur_area : area_id ; \
|
|
return dms->regions[region_id].counters[area_id].counter; \
|
|
}
|
|
|
|
MK_STATS_GET_COUNTER_FN(reads)
|
|
MK_STATS_GET_COUNTER_FN(reads_merged)
|
|
MK_STATS_GET_COUNTER_FN(read_sectors)
|
|
MK_STATS_GET_COUNTER_FN(read_nsecs)
|
|
MK_STATS_GET_COUNTER_FN(writes)
|
|
MK_STATS_GET_COUNTER_FN(writes_merged)
|
|
MK_STATS_GET_COUNTER_FN(write_sectors)
|
|
MK_STATS_GET_COUNTER_FN(write_nsecs)
|
|
MK_STATS_GET_COUNTER_FN(io_in_progress)
|
|
MK_STATS_GET_COUNTER_FN(io_nsecs)
|
|
MK_STATS_GET_COUNTER_FN(weighted_io_nsecs)
|
|
MK_STATS_GET_COUNTER_FN(total_read_nsecs)
|
|
MK_STATS_GET_COUNTER_FN(total_write_nsecs)
|
|
#undef MK_STATS_GET_COUNTER_FN
|
|
|
|
int dm_stats_get_rd_merges_per_sec(const struct dm_stats *dms, double *rrqm,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*rrqm = ((double) c->reads_merged) / (double) dms->interval_ns;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_wr_merges_per_sec(const struct dm_stats *dms, double *wrqm,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*wrqm = ((double) c->writes_merged) / (double) dms->interval_ns;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_reads_per_sec(const struct dm_stats *dms, double *rd_s,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*rd_s = ((double) c->reads * NSEC_PER_SEC) / (double) dms->interval_ns;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_writes_per_sec(const struct dm_stats *dms, double *wr_s,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*wr_s = ((double) c->writes * (double) NSEC_PER_SEC)
|
|
/ (double) dms->interval_ns;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_read_sectors_per_sec(const struct dm_stats *dms, double *rsec_s,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*rsec_s = ((double) c->read_sectors * (double) NSEC_PER_SEC)
|
|
/ (double) dms->interval_ns;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_write_sectors_per_sec(const struct dm_stats *dms, double *wsec_s,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
*wsec_s = ((double) c->write_sectors * (double) NSEC_PER_SEC)
|
|
/ (double) dms->interval_ns;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_average_request_size(const struct dm_stats *dms, double *arqsz,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t nr_ios, nr_sectors;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
*arqsz = 0.0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
nr_ios = c->reads + c->writes;
|
|
nr_sectors = c->read_sectors + c->write_sectors;
|
|
if (nr_ios)
|
|
*arqsz = (double) nr_sectors / (double) nr_ios;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_average_queue_size(const struct dm_stats *dms, double *qusz,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t io_ticks;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
*qusz = 0.0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
io_ticks = c->weighted_io_nsecs;
|
|
if (io_ticks)
|
|
*qusz = (double) io_ticks / (double) dms->interval_ns;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_average_wait_time(const struct dm_stats *dms, double *await,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t io_ticks, nr_ios;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
*await = 0.0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
io_ticks = c->read_nsecs + c->write_nsecs;
|
|
nr_ios = c->reads + c->writes;
|
|
if (nr_ios)
|
|
*await = (double) io_ticks / (double) nr_ios;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_average_rd_wait_time(const struct dm_stats *dms,
|
|
double *await, uint64_t region_id,
|
|
uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t rd_io_ticks, nr_rd_ios;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
*await = 0.0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
rd_io_ticks = c->read_nsecs;
|
|
nr_rd_ios = c->reads;
|
|
if (rd_io_ticks)
|
|
*await = (double) rd_io_ticks / (double) nr_rd_ios;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_average_wr_wait_time(const struct dm_stats *dms,
|
|
double *await, uint64_t region_id,
|
|
uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t wr_io_ticks, nr_wr_ios;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
*await = 0.0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
wr_io_ticks = c->write_nsecs;
|
|
nr_wr_ios = c->writes;
|
|
if (wr_io_ticks && nr_wr_ios)
|
|
*await = (double) wr_io_ticks / (double) nr_wr_ios;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_service_time(const struct dm_stats *dms, double *svctm,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
dm_percent_t util;
|
|
double tput;
|
|
|
|
if (!dm_stats_get_throughput(dms, &tput, region_id, area_id))
|
|
return_0;
|
|
|
|
if (!dm_stats_get_utilization(dms, &util, region_id, area_id))
|
|
return_0;
|
|
|
|
/* avoid NAN with zero counter values */
|
|
if ( (uint64_t) tput == 0 || (uint64_t) util == 0) {
|
|
*svctm = 0.0;
|
|
return 1;
|
|
}
|
|
*svctm = ((double) NSEC_PER_SEC * dm_percent_to_float(util))
|
|
/ (100.0 * tput);
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_throughput(const struct dm_stats *dms, double *tput,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
|
|
*tput = (( NSEC_PER_SEC * ((double) c->reads + (double) c->writes))
|
|
/ (double) (dms->interval_ns));
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_utilization(const struct dm_stats *dms, dm_percent_t *util,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_counters *c;
|
|
uint64_t io_nsecs;
|
|
|
|
if (!dms->interval_ns)
|
|
return_0;
|
|
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
c = &(dms->regions[region_id].counters[area_id]);
|
|
|
|
/**
|
|
* If io_nsec > interval_ns there is something wrong with the clock
|
|
* for the last interval; do not allow a value > 100% utilization
|
|
* to be passed to a dm_make_percent() call. We expect to see these
|
|
* at startup if counters have not been cleared before the first read.
|
|
*/
|
|
io_nsecs = (c->io_nsecs <= dms->interval_ns) ? c->io_nsecs : dms->interval_ns;
|
|
*util = dm_make_percent(io_nsecs, dms->interval_ns);
|
|
|
|
return 1;
|
|
}
|
|
|
|
void dm_stats_set_sampling_interval_ms(struct dm_stats *dms, uint64_t interval_ms)
|
|
{
|
|
/* All times use nsecs internally. */
|
|
dms->interval_ns = interval_ms * NSEC_PER_MSEC;
|
|
}
|
|
|
|
void dm_stats_set_sampling_interval_ns(struct dm_stats *dms, uint64_t interval_ns)
|
|
{
|
|
dms->interval_ns = interval_ns;
|
|
}
|
|
|
|
uint64_t dm_stats_get_sampling_interval_ms(const struct dm_stats *dms)
|
|
{
|
|
/* All times use nsecs internally. */
|
|
return (dms->interval_ns / NSEC_PER_MSEC);
|
|
}
|
|
|
|
uint64_t dm_stats_get_sampling_interval_ns(const struct dm_stats *dms)
|
|
{
|
|
/* All times use nsecs internally. */
|
|
return (dms->interval_ns);
|
|
}
|
|
|
|
int dm_stats_set_program_id(struct dm_stats *dms, int allow_empty,
|
|
const char *program_id)
|
|
{
|
|
if (!allow_empty && (!program_id || !strlen(program_id))) {
|
|
log_error("Empty program_id not permitted without "
|
|
"allow_empty=1");
|
|
return 0;
|
|
}
|
|
|
|
if (!program_id)
|
|
program_id = "";
|
|
|
|
if (dms->program_id)
|
|
dm_free(dms->program_id);
|
|
|
|
if (!(dms->program_id = dm_strdup(program_id)))
|
|
return_0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
uint64_t dm_stats_get_current_region(const struct dm_stats *dms)
|
|
{
|
|
return dms->cur_region;
|
|
}
|
|
|
|
uint64_t dm_stats_get_current_area(const struct dm_stats *dms)
|
|
{
|
|
return dms->cur_area;
|
|
}
|
|
|
|
int dm_stats_get_region_start(const struct dm_stats *dms, uint64_t *start,
|
|
uint64_t region_id)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
*start = dms->regions[region_id].start;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_region_len(const struct dm_stats *dms, uint64_t *len,
|
|
uint64_t region_id)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
*len = dms->regions[region_id].len;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_region_area_len(const struct dm_stats *dms, uint64_t *len,
|
|
uint64_t region_id)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
*len = dms->regions[region_id].step;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_current_region_start(const struct dm_stats *dms,
|
|
uint64_t *start)
|
|
{
|
|
return dm_stats_get_region_start(dms, start, dms->cur_region);
|
|
}
|
|
|
|
int dm_stats_get_current_region_len(const struct dm_stats *dms,
|
|
uint64_t *len)
|
|
{
|
|
return dm_stats_get_region_len(dms, len, dms->cur_region);
|
|
}
|
|
|
|
int dm_stats_get_current_region_area_len(const struct dm_stats *dms,
|
|
uint64_t *step)
|
|
{
|
|
return dm_stats_get_region_area_len(dms, step, dms->cur_region);
|
|
}
|
|
|
|
int dm_stats_get_area_start(const struct dm_stats *dms, uint64_t *start,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
struct dm_stats_region *region;
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
region = &dms->regions[region_id];
|
|
*start = region->start + region->step * area_id;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_area_offset(const struct dm_stats *dms, uint64_t *offset,
|
|
uint64_t region_id, uint64_t area_id)
|
|
{
|
|
if (!dms || !dms->regions)
|
|
return_0;
|
|
*offset = dms->regions[region_id].step * area_id;
|
|
return 1;
|
|
}
|
|
|
|
int dm_stats_get_current_area_start(const struct dm_stats *dms,
|
|
uint64_t *start)
|
|
{
|
|
return dm_stats_get_area_start(dms, start,
|
|
dms->cur_region, dms->cur_area);
|
|
}
|
|
|
|
int dm_stats_get_current_area_offset(const struct dm_stats *dms,
|
|
uint64_t *offset)
|
|
{
|
|
return dm_stats_get_area_offset(dms, offset,
|
|
dms->cur_region, dms->cur_area);
|
|
}
|
|
|
|
int dm_stats_get_current_area_len(const struct dm_stats *dms,
|
|
uint64_t *len)
|
|
{
|
|
return dm_stats_get_region_area_len(dms, len, dms->cur_region);
|
|
}
|
|
|
|
const char *dm_stats_get_region_program_id(const struct dm_stats *dms,
|
|
uint64_t region_id)
|
|
{
|
|
const char *program_id = dms->regions[region_id].program_id;
|
|
return (program_id) ? program_id : "";
|
|
}
|
|
|
|
const char *dm_stats_get_region_aux_data(const struct dm_stats *dms,
|
|
uint64_t region_id)
|
|
{
|
|
const char *aux_data = dms->regions[region_id].aux_data;
|
|
return (aux_data) ? aux_data : "" ;
|
|
}
|
|
|
|
const char *dm_stats_get_current_region_program_id(const struct dm_stats *dms)
|
|
{
|
|
return dm_stats_get_region_program_id(dms, dms->cur_region);
|
|
}
|
|
|
|
const char *dm_stats_get_current_region_aux_data(const struct dm_stats *dms)
|
|
{
|
|
return dm_stats_get_region_aux_data(dms, dms->cur_region);
|
|
}
|
|
|
|
int dm_stats_get_region_precise_timestamps(const struct dm_stats *dms,
|
|
uint64_t region_id)
|
|
{
|
|
struct dm_stats_region *region = &dms->regions[region_id];
|
|
return region->timescale == 1;
|
|
}
|
|
|
|
int dm_stats_get_current_region_precise_timestamps(const struct dm_stats *dms)
|
|
{
|
|
return dm_stats_get_region_precise_timestamps(dms, dms->cur_region);
|
|
}
|
|
|
|
/*
|
|
* Histogram access methods.
|
|
*/
|
|
|
|
struct dm_histogram *dm_stats_get_histogram(const struct dm_stats *dms,
|
|
uint64_t region_id,
|
|
uint64_t area_id)
|
|
{
|
|
region_id = (region_id == DM_STATS_REGION_CURRENT)
|
|
? dms->cur_region : region_id ;
|
|
area_id = (area_id == DM_STATS_AREA_CURRENT)
|
|
? dms->cur_area : area_id ;
|
|
|
|
if (!dms->regions[region_id].counters)
|
|
return dms->regions[region_id].bounds;
|
|
|
|
return dms->regions[region_id].counters[area_id].histogram;
|
|
}
|
|
|
|
int dm_histogram_get_nr_bins(const struct dm_histogram *dmh)
|
|
{
|
|
return dmh->nr_bins;
|
|
}
|
|
|
|
uint64_t dm_histogram_get_bin_lower(const struct dm_histogram *dmh, int bin)
|
|
{
|
|
return (!bin) ? 0 : dmh->bins[bin - 1].upper;
|
|
}
|
|
|
|
uint64_t dm_histogram_get_bin_upper(const struct dm_histogram *dmh, int bin)
|
|
{
|
|
return dmh->bins[bin].upper;
|
|
}
|
|
|
|
uint64_t dm_histogram_get_bin_width(const struct dm_histogram *dmh, int bin)
|
|
{
|
|
uint64_t upper, lower;
|
|
upper = dm_histogram_get_bin_upper(dmh, bin);
|
|
lower = dm_histogram_get_bin_lower(dmh, bin);
|
|
return (upper - lower);
|
|
}
|
|
|
|
uint64_t dm_histogram_get_bin_count(const struct dm_histogram *dmh, int bin)
|
|
{
|
|
return dmh->bins[bin].count;
|
|
}
|
|
|
|
uint64_t dm_histogram_get_sum(const struct dm_histogram *dmh)
|
|
{
|
|
return dmh->sum;
|
|
}
|
|
|
|
dm_percent_t dm_histogram_get_bin_percent(const struct dm_histogram *dmh,
|
|
int bin)
|
|
{
|
|
uint64_t value = dm_histogram_get_bin_count(dmh, bin);
|
|
uint64_t width = dm_histogram_get_bin_width(dmh, bin);
|
|
uint64_t total = dm_histogram_get_sum(dmh);
|
|
|
|
double val = (double) value;
|
|
|
|
if (!total || !value || !width)
|
|
return DM_PERCENT_0;
|
|
|
|
return dm_make_percent((uint64_t) val, total);
|
|
}
|
|
|
|
/*
|
|
* Histogram string helper functions: used to construct histogram and
|
|
* bin boundary strings from numeric data.
|
|
*/
|
|
|
|
/*
|
|
* Allocate an unbound histogram object with nr_bins bins. Only used
|
|
* for histograms used to hold bounds values as arguments for calls to
|
|
* dm_stats_create_region().
|
|
*/
|
|
static struct dm_histogram *_alloc_dm_histogram(int nr_bins)
|
|
{
|
|
/* Allocate space for dm_histogram + nr_entries. */
|
|
size_t size = sizeof(struct dm_histogram) +
|
|
(unsigned) nr_bins * sizeof(struct dm_histogram_bin);
|
|
return dm_zalloc(size);
|
|
}
|
|
|
|
/*
|
|
* Parse a histogram bounds string supplied by the user. The string
|
|
* consists of a list of numbers, "n1,n2,n3,..." with optional 'ns',
|
|
* 'us', 'ms', or 's' unit suffixes.
|
|
*
|
|
* The scale parameter indicates the timescale used for this region: one
|
|
* for nanoscale resolution and NSEC_PER_MSEC for miliseconds.
|
|
*
|
|
* On return bounds contains a pointer to an array of uint64_t
|
|
* histogram bounds values expressed in units of nanoseconds.
|
|
*/
|
|
struct dm_histogram *dm_histogram_bounds_from_string(const char *bounds_str)
|
|
{
|
|
static const char *_valid_chars = "0123456789,muns";
|
|
uint64_t this_val = 0, mult = 1;
|
|
const char *c, *v, *val_start;
|
|
struct dm_histogram_bin *cur;
|
|
struct dm_histogram *dmh;
|
|
int nr_entries = 1;
|
|
char *endptr;
|
|
|
|
c = bounds_str;
|
|
|
|
/* Count number of bounds entries. */
|
|
while(*c)
|
|
if (*(c++) == ',')
|
|
nr_entries++;
|
|
|
|
c = bounds_str;
|
|
|
|
if (!(dmh = _alloc_dm_histogram(nr_entries)))
|
|
return_0;
|
|
|
|
dmh->nr_bins = nr_entries;
|
|
|
|
cur = dmh->bins;
|
|
|
|
do {
|
|
for (v = _valid_chars; *v; v++)
|
|
if (*c == *v)
|
|
break;
|
|
|
|
if (!*v) {
|
|
stack;
|
|
goto badchar;
|
|
}
|
|
|
|
if (*c == ',') {
|
|
log_error("Empty histogram bin not allowed: %s",
|
|
bounds_str);
|
|
goto bad;
|
|
} else {
|
|
val_start = c;
|
|
endptr = NULL;
|
|
|
|
this_val = strtoull(val_start, &endptr, 10);
|
|
if (!endptr) {
|
|
log_error("Could not parse histogram bound.");
|
|
goto bad;
|
|
}
|
|
c = endptr; /* Advance to units, comma, or end. */
|
|
|
|
if (*c == 's') {
|
|
mult = NSEC_PER_SEC;
|
|
c++; /* Advance over 's'. */
|
|
} else if (*(c + 1) == 's') {
|
|
if (*c == 'm')
|
|
mult = NSEC_PER_MSEC;
|
|
else if (*c == 'u')
|
|
mult = NSEC_PER_USEC;
|
|
else if (*c == 'n')
|
|
mult = 1;
|
|
else {
|
|
stack;
|
|
goto badchar;
|
|
}
|
|
c += 2; /* Advance over 'ms', 'us', or 'ns'. */
|
|
} else if (*c == ',')
|
|
c++;
|
|
else if (*c) { /* Expected ',' or NULL. */
|
|
stack;
|
|
goto badchar;
|
|
}
|
|
|
|
if (*c == ',')
|
|
c++;
|
|
this_val *= mult;
|
|
(cur++)->upper = this_val;
|
|
}
|
|
} while (*c);
|
|
|
|
/* Bounds histograms have no owner. */
|
|
dmh->dms = NULL;
|
|
dmh->region = NULL;
|
|
|
|
return dmh;
|
|
|
|
badchar:
|
|
log_error("Invalid character in histogram: %c", *c);
|
|
bad:
|
|
dm_free(dmh);
|
|
return NULL;
|
|
}
|
|
|
|
struct dm_histogram *dm_histogram_bounds_from_uint64(const uint64_t *bounds)
|
|
{
|
|
const uint64_t *entry = bounds;
|
|
struct dm_histogram_bin *cur;
|
|
struct dm_histogram *dmh;
|
|
int nr_entries = 1;
|
|
|
|
if (!bounds || !bounds[0]) {
|
|
log_error("Could not parse empty histogram bounds array");
|
|
return 0;
|
|
}
|
|
|
|
/* Count number of bounds entries. */
|
|
while(*entry)
|
|
if (*(++entry))
|
|
nr_entries++;
|
|
|
|
entry = bounds;
|
|
|
|
if (!(dmh = _alloc_dm_histogram(nr_entries)))
|
|
return_0;
|
|
|
|
dmh->nr_bins = nr_entries;
|
|
|
|
cur = dmh->bins;
|
|
|
|
while (*entry)
|
|
(cur++)->upper = *(entry++);
|
|
|
|
/* Bounds histograms have no owner. */
|
|
dmh->dms = NULL;
|
|
dmh->region = NULL;
|
|
|
|
return dmh;
|
|
}
|
|
|
|
void dm_histogram_bounds_destroy(struct dm_histogram *bounds)
|
|
{
|
|
if (!bounds)
|
|
return;
|
|
|
|
/* Bounds histograms are not bound to any handle or region. */
|
|
if (bounds->dms || bounds->region) {
|
|
log_error("Freeing invalid histogram bounds pointer %p.",
|
|
(void *) bounds);
|
|
stack;
|
|
}
|
|
/* dm_free() expects a (void *). */
|
|
dm_free((void *) bounds);
|
|
}
|
|
|
|
/*
|
|
* Scale a bounds value down from nanoseconds to the largest possible
|
|
* whole unit suffix.
|
|
*/
|
|
static void _scale_bound_value_to_suffix(uint64_t *bound, const char **suffix)
|
|
{
|
|
*suffix = "ns";
|
|
if (!(*bound % NSEC_PER_SEC)) {
|
|
*bound /= NSEC_PER_SEC;
|
|
*suffix = "s";
|
|
} else if (!(*bound % NSEC_PER_MSEC)) {
|
|
*bound /= NSEC_PER_MSEC;
|
|
*suffix = "ms";
|
|
} else if (!(*bound % NSEC_PER_USEC)) {
|
|
*bound /= NSEC_PER_USEC;
|
|
*suffix = "us";
|
|
}
|
|
}
|
|
|
|
#define DM_HISTOGRAM_BOUNDS_MASK 0x30
|
|
|
|
static int _make_bounds_string(char *buf, size_t size, uint64_t lower,
|
|
uint64_t upper, int flags, int width)
|
|
{
|
|
const char *l_suff = NULL;
|
|
const char *u_suff = NULL;
|
|
const char *sep = "";
|
|
char bound_buf[32];
|
|
int bounds = flags & DM_HISTOGRAM_BOUNDS_MASK;
|
|
|
|
if (!bounds)
|
|
return_0;
|
|
|
|
*buf = '\0';
|
|
|
|
if (flags & DM_HISTOGRAM_SUFFIX) {
|
|
_scale_bound_value_to_suffix(&lower, &l_suff);
|
|
_scale_bound_value_to_suffix(&upper, &u_suff);
|
|
} else
|
|
l_suff = u_suff = "";
|
|
|
|
if (flags & DM_HISTOGRAM_VALUES)
|
|
sep = ":";
|
|
|
|
if (bounds > DM_HISTOGRAM_BOUNDS_LOWER) {
|
|
/* Handle infinite uppermost bound. */
|
|
if (upper == UINT64_MAX) {
|
|
if (dm_snprintf(bound_buf, sizeof(bound_buf),
|
|
">" FMTu64 "%s", lower, l_suff) < 0)
|
|
goto_out;
|
|
/* Only display an 'upper' string for final bin. */
|
|
bounds = DM_HISTOGRAM_BOUNDS_UPPER;
|
|
} else {
|
|
if (dm_snprintf(bound_buf, sizeof(bound_buf),
|
|
FMTu64 "%s", upper, u_suff) < 0)
|
|
goto_out;
|
|
}
|
|
} else if (bounds == DM_HISTOGRAM_BOUNDS_LOWER) {
|
|
if ((dm_snprintf(bound_buf, sizeof(bound_buf), FMTu64 "%s",
|
|
lower, l_suff)) < 0)
|
|
goto_out;
|
|
}
|
|
|
|
switch (bounds) {
|
|
case DM_HISTOGRAM_BOUNDS_LOWER:
|
|
case DM_HISTOGRAM_BOUNDS_UPPER:
|
|
return dm_snprintf(buf, size, "%*s%s", width, bound_buf, sep);
|
|
case DM_HISTOGRAM_BOUNDS_RANGE:
|
|
return dm_snprintf(buf, size, FMTu64 "%s-%s%s",
|
|
lower, l_suff, bound_buf, sep);
|
|
}
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
#define BOUND_WIDTH_NOSUFFIX 10 /* 999999999 nsecs */
|
|
#define BOUND_WIDTH 6 /* bounds string up to 9999xs */
|
|
#define COUNT_WIDTH 6 /* count string: up to 9999 */
|
|
#define PERCENT_WIDTH 6 /* percent string : 0.00-100.00% */
|
|
#define DM_HISTOGRAM_VALUES_MASK 0x06
|
|
|
|
const char *dm_histogram_to_string(const struct dm_histogram *dmh, int bin,
|
|
int width, int flags)
|
|
{
|
|
int minwidth, bounds, values, start, last;
|
|
uint64_t lower, upper, val_u64; /* bounds of the current bin. */
|
|
/* Use the histogram pool for string building. */
|
|
struct dm_pool *mem = dmh->dms->hist_mem;
|
|
char buf[64], bounds_buf[64];
|
|
const char *sep = "";
|
|
int bounds_width;
|
|
ssize_t len = 0;
|
|
float val_flt;
|
|
|
|
bounds = flags & DM_HISTOGRAM_BOUNDS_MASK;
|
|
values = flags & DM_HISTOGRAM_VALUES;
|
|
|
|
if (bin < 0) {
|
|
start = 0;
|
|
last = dmh->nr_bins - 1;
|
|
} else
|
|
start = last = bin;
|
|
|
|
minwidth = width;
|
|
|
|
if (width < 0 || !values)
|
|
width = minwidth = 0; /* no padding */
|
|
else if (flags & DM_HISTOGRAM_PERCENT)
|
|
width = minwidth = (width) ? : PERCENT_WIDTH;
|
|
else if (flags & DM_HISTOGRAM_VALUES)
|
|
width = minwidth = (width) ? : COUNT_WIDTH;
|
|
|
|
if (values && !width)
|
|
sep = ":";
|
|
|
|
/* Set bounds string to the empty string. */
|
|
bounds_buf[0] = '\0';
|
|
|
|
if (!dm_pool_begin_object(mem, 64))
|
|
return_0;
|
|
|
|
for (bin = start; bin <= last; bin++) {
|
|
if (bounds) {
|
|
/* Default bounds width depends on time suffixes. */
|
|
bounds_width = (!(flags & DM_HISTOGRAM_SUFFIX))
|
|
? BOUND_WIDTH_NOSUFFIX
|
|
: BOUND_WIDTH ;
|
|
|
|
bounds_width = (!width) ? width : bounds_width;
|
|
|
|
lower = dm_histogram_get_bin_lower(dmh, bin);
|
|
upper = dm_histogram_get_bin_upper(dmh, bin);
|
|
|
|
len = sizeof(bounds_buf);
|
|
len = _make_bounds_string(bounds_buf, len,
|
|
lower, upper, flags,
|
|
bounds_width);
|
|
/*
|
|
* Comma separates "bounds: value" pairs unless
|
|
* --noheadings is used.
|
|
*/
|
|
sep = (width || !values) ? "," : ":";
|
|
|
|
/* Adjust width by real bounds length if set. */
|
|
width -= (width) ? (len - (bounds_width + 1)) : 0;
|
|
|
|
/* -ve width indicates specified width was overrun. */
|
|
width = (width > 0) ? width : 0;
|
|
}
|
|
|
|
if (bin == last)
|
|
sep = "";
|
|
|
|
if (flags & DM_HISTOGRAM_PERCENT) {
|
|
dm_percent_t pr;
|
|
pr = dm_histogram_get_bin_percent(dmh, bin);
|
|
val_flt = dm_percent_to_float(pr);
|
|
len = dm_snprintf(buf, sizeof(buf), "%s%*.2f%%%s",
|
|
bounds_buf, width, val_flt, sep);
|
|
} else if (values) {
|
|
val_u64 = dmh->bins[bin].count;
|
|
len = dm_snprintf(buf, sizeof(buf), "%s%*"PRIu64"%s",
|
|
bounds_buf, width, val_u64, sep);
|
|
} else if (bounds)
|
|
len = dm_snprintf(buf, sizeof(buf), "%s%s", bounds_buf,
|
|
sep);
|
|
else {
|
|
*buf = '\0';
|
|
len = 0;
|
|
}
|
|
|
|
if (len < 0)
|
|
goto_bad;
|
|
|
|
width = minwidth; /* re-set histogram column width. */
|
|
if (!dm_pool_grow_object(mem, buf, (size_t) len))
|
|
goto_bad;
|
|
}
|
|
|
|
if (!dm_pool_grow_object(mem, "\0", 1))
|
|
goto_bad;
|
|
|
|
return (const char *) dm_pool_end_object(mem);
|
|
|
|
bad:
|
|
dm_pool_abandon_object(mem);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Backward compatible dm_stats_create_region() implementations.
|
|
*
|
|
* Keep these at the end of the file to avoid adding clutter around the
|
|
* current dm_stats_create_region() version.
|
|
*/
|
|
|
|
#if defined(__GNUC__)
|
|
int dm_stats_create_region_v1_02_106(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
int precise, const char *program_id,
|
|
const char *aux_data);
|
|
int dm_stats_create_region_v1_02_106(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
int precise, const char *program_id,
|
|
const char *aux_data)
|
|
{
|
|
/* 1.02.106 lacks histogram argument. */
|
|
return _stats_create_region(dms, region_id, start, len, step, precise,
|
|
NULL, program_id, aux_data);
|
|
}
|
|
DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_106);
|
|
|
|
int dm_stats_create_region_v1_02_104(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
const char *program_id, const char *aux_data);
|
|
int dm_stats_create_region_v1_02_104(struct dm_stats *dms, uint64_t *region_id,
|
|
uint64_t start, uint64_t len, int64_t step,
|
|
const char *program_id, const char *aux_data)
|
|
{
|
|
/* 1.02.104 lacks histogram and precise arguments. */
|
|
return _stats_create_region(dms, region_id, start, len, step, 0, NULL,
|
|
program_id, aux_data);
|
|
}
|
|
DM_EXPORT_SYMBOL(dm_stats_create_region, 1_02_104);
|
|
#endif
|