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perf evlist: Add API to pause/resume

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perf_evlist__toggle_{pause,resume}() are introduced to pause/resume
events in an evlist. Utilize PERF_EVENT_IOC_PAUSE_OUTPUT ioctl.

Following commits use them to ensure overwrite ring buffer is paused
before reading.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1463987628-163563-2-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
[ Return -1, like all other ioctl() usage in evlist.c, rename 'pause'
  arg to avoid breaking the build on ubuntu 12.04 and other old systems ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-05-23 07:13:38 +00:00 committed by Arnaldo Carvalho de Melo
parent 12f3ca4fc8
commit 65aea23387
2 changed files with 29 additions and 0 deletions
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27
tools/perf/util/evlist.c
View File

@ -679,6 +679,33 @@ static struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
return NULL;
}
static int perf_evlist__set_paused(struct perf_evlist *evlist, bool value)
{
int i;
for (i = 0; i < evlist->nr_mmaps; i++) {
int fd = evlist->mmap[i].fd;
int err;
if (fd < 0)
continue;
err = ioctl(fd, PERF_EVENT_IOC_PAUSE_OUTPUT, value ? 1 : 0);
if (err)
return err;
}
return 0;
}
int perf_evlist__pause(struct perf_evlist *evlist)
{
return perf_evlist__set_paused(evlist, true);
}
int perf_evlist__resume(struct perf_evlist *evlist)
{
return perf_evlist__set_paused(evlist, false);
}
/* When check_messup is true, 'end' must points to a good entry */
static union perf_event *
perf_mmap__read(struct perf_mmap *md, bool check_messup, u64 start,

2
tools/perf/util/evlist.h
View File

@ -136,6 +136,8 @@ void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx);
void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx);
int perf_evlist__pause(struct perf_evlist *evlist);
int perf_evlist__resume(struct perf_evlist *evlist);
int perf_evlist__open(struct perf_evlist *evlist);
void perf_evlist__close(struct perf_evlist *evlist);