dm thin: performance improvement to discard processing

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When processing a discard bio, if the block is already quiesced do the
discard immediately rather than adding the mapping to a list for the
next iteration of the worker thread.

Discarding a fully provisioned 100G thin volume with 64k block size goes
from 860s to 95s with this change.

Clearly there's something wrong with the worker architecture, more
investigation needed.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Joe Thornber 2014-09-12 11:34:01 +01:00 • committed by Mike Snitzer

parent 36f12aeb71

commit 7a7e97ca58

1 changed files with 3 additions and 7 deletions

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drivers/md/dm-thin.c

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