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dmstats: add --precise switch to enable nanosecond counters.

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This commit is contained in:
Bryn M. Reeves 2015-08-18 12:39:34 +01:00
parent 567189cc76
commit e4145ebc47
3 changed files with 24 additions and 2 deletions
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1
WHATS_NEW_DM
View File

@ -1,5 +1,6 @@
Version 1.02.106 -
===================================
Add --precise switch to 'dmstats create' to request nanosecond counters.
Add precise argument to dm_stats_create_region().
Add support to libdm-stats for precise_timestamps

9
man/dmstats.8.in
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@ -32,6 +32,7 @@ dmstats \(em device-mapper statistics management
.IR nr_areas ]
.RB |[ \-\-areasize
.IR area_size ]]
.RB [ \-\-precise ]
.RB [[ \-\-start
.IR start_sector ]
.RB [ \-\-length
@ -181,6 +182,10 @@ Specify which report fields to display.
Sort output according to the list of fields given. Precede any
sort_field with - for a reverse sort on that column.
.TP
.BR \-\-precise
Attempt to use nanosecond precision counters when creating new
statistics regions.
.TP
.B \-\-programid \fIid
Specify a program ID string. When creating new statistics regions this
string is stored with the region. Subsequent operations may supply a
@ -240,6 +245,7 @@ regions (with the exception of in-flight IO counters).
.IR nr_areas ]
.RB [ \-\-areasize
.IR area_size ]
.RB [ \-\-precise ]
.RB [[ \-\-start
.IR start_sector ]
.RB [ \-\-length
@ -259,6 +265,9 @@ at an arbitrary offset into the device. The \fB\-\-segments\fP option
causes a new region to be created for each target in the corresponding
device-mapper device's table.
If the \fB\-\-precise\fP option is used the command will attempt to
create a region using nanosecond precision counters.
An optional \fBprogram_id\fP or \fBaux_data\fP string may be associated
with the region. A \fBprogram_id\fP may then be used to select regions
for subsequent list, print, and report operations. The \fBaux_data\fP

16
tools/dmsetup.c
View File

@ -190,6 +190,7 @@ enum {
NOUDEVRULES_ARG,
NOUDEVSYNC_ARG,
OPTIONS_ARG,
PRECISE_ARG,
PROGRAM_ID_ARG,
RAW_ARG,
READAHEAD_ARG,
@ -4473,7 +4474,7 @@ static int _do_stats_create_regions(struct dm_stats *dms,
struct dm_info info;
void *next = NULL;
const char *devname = NULL;
int r = 0;
int r = 0, precise = _switches[PRECISE_ARG];
if (!(dmt = dm_task_create(DM_DEVICE_TABLE))) {
dm_stats_destroy(dms);
@ -4520,7 +4521,7 @@ static int _do_stats_create_regions(struct dm_stats *dms,
this_len = (segments) ? segment_len : this_len;
if (!dm_stats_create_region(dms, &region_id,
this_start, this_len, step,
-1,
precise,
program_id, aux_data)) {
log_error("%s: Could not create statistics region.",
devname);
@ -4631,6 +4632,14 @@ static int _stats_create(CMD_ARGS)
if (!_bind_stats_device(dms, name))
goto_out;
if (_switches[PRECISE_ARG]) {
if (!dm_stats_driver_supports_precise()) {
log_error("Using --precise requires driver version "
"4.32.0 or later.");
goto out;
}
}
if (!strlen(program_id))
/* force creation of a region with no id */
dm_stats_set_program_id(dms, 1, NULL);
@ -5497,6 +5506,7 @@ static int _process_switches(int *argcp, char ***argvp, const char *dev_dir)
{"noudevrules", 0, &ind, NOUDEVRULES_ARG},
{"noudevsync", 0, &ind, NOUDEVSYNC_ARG},
{"options", 1, &ind, OPTIONS_ARG},
{"precise", 0, &ind, PRECISE_ARG},
{"programid", 1, &ind, PROGRAM_ID_ARG},
{"raw", 0, &ind, RAW_ARG},
{"readahead", 1, &ind, READAHEAD_ARG},
@ -5648,6 +5658,8 @@ static int _process_switches(int *argcp, char ***argvp, const char *dev_dir)
_switches[PROGRAM_ID_ARG]++;
_string_args[PROGRAM_ID_ARG] = optarg;
}
if (ind == PRECISE_ARG)
_switches[PRECISE_ARG]++;
if (ind == RAW_ARG)
_switches[RAW_ARG]++;
if (ind == REGION_ID_ARG) {