diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2015-08-18 22:26:16 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2015-08-18 23:20:03 +0200 |
| commit | bd49784fd1e8f42c7600fbfa206361324857f373 (patch) | |
| tree | 238d475c49cc50ba1543e6692553a6a0f3b384e8 /drivers/md | |
| parent | dm thin: optimize async discard submission (diff) | |
| download | linux-bd49784fd1e8f42c7600fbfa206361324857f373.tar.xz linux-bd49784fd1e8f42c7600fbfa206361324857f373.zip | |
dm stats: report precise_timestamps and histogram in @stats_list output
If the user selected the precise_timestamps or histogram options, report
it in the @stats_list message output.
If the user didn't select these options, no extra tokens are reported,
thus it is backward compatible with old software that doesn't know about
precise timestamps and histogram.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.2
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-stats.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c index 8a8b48fa901a..8289804ccd99 100644 --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -457,12 +457,24 @@ static int dm_stats_list(struct dm_stats *stats, const char *program, list_for_each_entry(s, &stats->list, list_entry) { if (!program || !strcmp(program, s->program_id)) { len = s->end - s->start; - DMEMIT("%d: %llu+%llu %llu %s %s\n", s->id, + DMEMIT("%d: %llu+%llu %llu %s %s", s->id, (unsigned long long)s->start, (unsigned long long)len, (unsigned long long)s->step, s->program_id, s->aux_data); + if (s->stat_flags & STAT_PRECISE_TIMESTAMPS) + DMEMIT(" precise_timestamps"); + if (s->n_histogram_entries) { + unsigned i; + DMEMIT(" histogram:"); + for (i = 0; i < s->n_histogram_entries; i++) { + if (i) + DMEMIT(","); + DMEMIT("%llu", s->histogram_boundaries[i]); + } + } + DMEMIT("\n"); } } mutex_unlock(&stats->mutex); |