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authorShaohua Li <shli@fb.com>2017-07-12 11:49:56 -0700
committerJens Axboe <axboe@kernel.dk>2017-07-29 09:00:03 -0600
commit35fe6d763229e8fc0eb5f9b93a401673cfcb5e1e (patch)
treeea38b526a62121671ef7bfff76f7d23e29804b42 /block/blk-throttle.c
parent69fd5c391763bd94a40dd152bc72a7f230137150 (diff)
downloadlinux-0-day-35fe6d763229e8fc0eb5f9b93a401673cfcb5e1e.tar.gz
block: use standard blktrace API to output cgroup info for debug notes
Currently cfq/bfq/blk-throttle output cgroup info in trace in their own way. Now we have standard blktrace API for this, so convert them to use it. Note, this changes the behavior a little bit. cgroup info isn't output by default, we only do this with 'blk_cgroup' option enabled. cgroup info isn't output as a string by default too, we only do this with 'blk_cgname' option enabled. Also cgroup info is output in different position of the note string. I think these behavior changes aren't a big issue (actually we make trace data shorter which is good), since the blktrace note is solely for debugging. Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-throttle.c')
-rw-r--r--block/blk-throttle.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a6ebd2b..6a4c4c4 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -373,10 +373,8 @@ static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
if (likely(!blk_trace_note_message_enabled(__td->queue))) \
break; \
if ((__tg)) { \
- char __pbuf[128]; \
- \
- blkg_path(tg_to_blkg(__tg), __pbuf, sizeof(__pbuf)); \
- blk_add_trace_msg(__td->queue, "throtl %s " fmt, __pbuf, ##args); \
+ blk_add_cgroup_trace_msg(__td->queue, \
+ tg_to_blkg(__tg)->blkcg, "throtl " fmt, ##args);\
} else { \
blk_add_trace_msg(__td->queue, "throtl " fmt, ##args); \
} \