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authorMikulas Patocka2015-08-18 16:26:16 -0400
committerMike Snitzer2015-08-18 17:20:03 -0400
commitbd49784fd1e8f42c7600fbfa206361324857f373 (patch)
tree238d475c49cc50ba1543e6692553a6a0f3b384e8
parent84f8bd86cc8977c344df572169f7ec10b8188cfa (diff)
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
-rw-r--r--Documentation/device-mapper/statistics.txt4
-rw-r--r--drivers/md/dm-stats.c14
-rw-r--r--include/uapi/linux/dm-ioctl.h4
3 files changed, 19 insertions, 3 deletions
diff --git a/Documentation/device-mapper/statistics.txt b/Documentation/device-mapper/statistics.txt
index 4919b2dfd1b3..6f5ef944ca4c 100644
--- a/Documentation/device-mapper/statistics.txt
+++ b/Documentation/device-mapper/statistics.txt
@@ -121,6 +121,10 @@ Messages
Output format:
<region_id>: <start_sector>+<length> <step> <program_id> <aux_data>
+ precise_timestamps histogram:n1,n2,n3,...
+
+ The strings "precise_timestamps" and "histogram" are printed only
+ if they were specified when creating the region.
@stats_print <region_id> [<starting_line> <number_of_lines>]
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);
diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 061aca3a962d..d34611e35a30 100644
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -267,9 +267,9 @@ enum {
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 32
+#define DM_VERSION_MINOR 33
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2015-6-26)"
+#define DM_VERSION_EXTRA "-ioctl (2015-8-18)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */