8e50d384cc
The tail position of the event buffer should only be modified after actually use that event. If not the event buffer could be invalid before use, and segment fault occurs when invoking perf top -G. Signed-off-by: Zhouyi Zhou <yizhouzhou@ict.ac.cn> Cc: David Ahern <dsahern@gmail.com> Cc: Zhouyi Zhou <yizhouzhou@ict.ac.cn> Link: http://lkml.kernel.org/r/1382600613-32177-1-git-send-email-zhouzhouyi@gmail.com [ Simplified the logic using exit gotos and renamed write_tail method to mmap_consume ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
122 lines
2.6 KiB
C
122 lines
2.6 KiB
C
#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <sys/mman.h>
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#include "tests.h"
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#include "util/evsel.h"
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#include "util/evlist.h"
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#include "util/cpumap.h"
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#include "util/thread_map.h"
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#define NR_LOOPS 1000000
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/*
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* This test will open software clock events (cpu-clock, task-clock)
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* then check their frequency -> period conversion has no artifact of
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* setting period to 1 forcefully.
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*/
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static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
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{
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int i, err = -1;
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volatile int tmp = 0;
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u64 total_periods = 0;
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int nr_samples = 0;
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union perf_event *event;
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struct perf_evsel *evsel;
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struct perf_evlist *evlist;
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struct perf_event_attr attr = {
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.type = PERF_TYPE_SOFTWARE,
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.config = clock_id,
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.sample_type = PERF_SAMPLE_PERIOD,
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.exclude_kernel = 1,
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.disabled = 1,
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.freq = 1,
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};
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attr.sample_freq = 10000;
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evlist = perf_evlist__new();
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if (evlist == NULL) {
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pr_debug("perf_evlist__new\n");
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return -1;
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}
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evsel = perf_evsel__new(&attr, 0);
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if (evsel == NULL) {
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pr_debug("perf_evsel__new\n");
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goto out_free_evlist;
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}
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perf_evlist__add(evlist, evsel);
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evlist->cpus = cpu_map__dummy_new();
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evlist->threads = thread_map__new_by_tid(getpid());
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if (!evlist->cpus || !evlist->threads) {
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err = -ENOMEM;
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pr_debug("Not enough memory to create thread/cpu maps\n");
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goto out_delete_maps;
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}
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perf_evlist__open(evlist);
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err = perf_evlist__mmap(evlist, 128, true);
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if (err < 0) {
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pr_debug("failed to mmap event: %d (%s)\n", errno,
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strerror(errno));
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goto out_close_evlist;
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}
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perf_evlist__enable(evlist);
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/* collect samples */
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for (i = 0; i < NR_LOOPS; i++)
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tmp++;
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perf_evlist__disable(evlist);
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while ((event = perf_evlist__mmap_read(evlist, 0)) != NULL) {
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struct perf_sample sample;
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if (event->header.type != PERF_RECORD_SAMPLE)
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goto next_event;
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err = perf_evlist__parse_sample(evlist, event, &sample);
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if (err < 0) {
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pr_debug("Error during parse sample\n");
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goto out_unmap_evlist;
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}
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total_periods += sample.period;
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nr_samples++;
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next_event:
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perf_evlist__mmap_consume(evlist, 0);
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}
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if ((u64) nr_samples == total_periods) {
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pr_debug("All (%d) samples have period value of 1!\n",
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nr_samples);
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err = -1;
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}
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out_unmap_evlist:
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perf_evlist__munmap(evlist);
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out_close_evlist:
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perf_evlist__close(evlist);
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out_delete_maps:
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perf_evlist__delete_maps(evlist);
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out_free_evlist:
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perf_evlist__delete(evlist);
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return err;
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}
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int test__sw_clock_freq(void)
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{
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int ret;
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ret = __test__sw_clock_freq(PERF_COUNT_SW_CPU_CLOCK);
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if (!ret)
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ret = __test__sw_clock_freq(PERF_COUNT_SW_TASK_CLOCK);
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return ret;
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}
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