md: add blktrace event for writes to superblock

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superblock write is an expensive operation. With raid5-cache, it can be called
regularly. Tracing to help performance debug.

Signed-off-by: Shaohua Li <shli@fb.com>
Cc: NeilBrown <neilb@suse.com>

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Shaohua Li 2016-11-18 09:44:08 -08:00

parent 578b54ade8

commit 504634f60f

1 changed files with 3 additions and 0 deletions

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drivers/md/md.c

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