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authorTejun Heo <tj@kernel.org>2019-07-16 07:58:31 -0700
committerJens Axboe <axboe@kernel.dk>2019-07-16 10:06:39 -0600
commit07b0fdecb2477396bcb69609019aade2b22124a1 (patch)
treeb554d081cf839d5d04679b62db42decb4e0cc517 /block
parentf7b76ac9d17e16e44feebb6d2749fec92bfd6dd4 (diff)
downloadlinux-07b0fdecb2477396bcb69609019aade2b22124a1.tar.bz2
blkcg: allow blkcg_policy->pd_stat() to print non-debug info too
Currently, ->pd_stat() is called only when moduleparam blkcg_debug_stats is set which prevents it from printing non-debug policy-specific statistics. Let's move debug testing down so that ->pd_stat() can print non-debug stat too. This patch doesn't cause any visible behavior change. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Josef Bacik <josef@toxicpanda.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-cgroup.c9
-rw-r--r--block/blk-iolatency.c3
2 files changed, 6 insertions, 6 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 24ed26957367..55a7dc227dfb 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -54,7 +54,7 @@ static struct blkcg_policy *blkcg_policy[BLKCG_MAX_POLS];
static LIST_HEAD(all_blkcgs); /* protected by blkcg_pol_mutex */
-static bool blkcg_debug_stats = false;
+bool blkcg_debug_stats = false;
static struct workqueue_struct *blkcg_punt_bio_wq;
static bool blkcg_policy_enabled(struct request_queue *q,
@@ -944,10 +944,7 @@ static int blkcg_print_stat(struct seq_file *sf, void *v)
dbytes, dios);
}
- if (!blkcg_debug_stats)
- goto next;
-
- if (atomic_read(&blkg->use_delay)) {
+ if (blkcg_debug_stats && atomic_read(&blkg->use_delay)) {
has_stats = true;
off += scnprintf(buf+off, size-off,
" use_delay=%d delay_nsec=%llu",
@@ -967,7 +964,7 @@ static int blkcg_print_stat(struct seq_file *sf, void *v)
has_stats = true;
off += written;
}
-next:
+
if (has_stats) {
if (off < size - 1) {
off += scnprintf(buf+off, size-off, "\n");
diff --git a/block/blk-iolatency.c b/block/blk-iolatency.c
index d973c38ee4fd..0fff7b56df0e 100644
--- a/block/blk-iolatency.c
+++ b/block/blk-iolatency.c
@@ -917,6 +917,9 @@ static size_t iolatency_pd_stat(struct blkg_policy_data *pd, char *buf,
unsigned long long avg_lat;
unsigned long long cur_win;
+ if (!blkcg_debug_stats)
+ return 0;
+
if (iolat->ssd)
return iolatency_ssd_stat(iolat, buf, size);