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Commit 504634f6 authored by Shaohua Li's avatar Shaohua Li
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md: add blktrace event for writes to superblock



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

Signed-off-by: default avatarShaohua Li <shli@fb.com>
Cc: NeilBrown <neilb@suse.com>
parent 578b54ad
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