block: use standard blktrace API to output cgroup info for debug notes

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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>

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This commit is contained in:

Shaohua Li 2017-07-12 11:49:56 -07:00 • committed by Jens Axboe

parent 69fd5c3917

commit 35fe6d7632

5 changed files with 35 additions and 24 deletions

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13

block/bfq-iosched.h

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6

block/blk-throttle.c

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15

block/cfq-iosched.c

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13

include/linux/blktrace_api.h

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12

kernel/trace/blktrace.c

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