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authorJoe Thornber <ejt@redhat.com>2014-09-12 11:34:01 +0100
committerMike Snitzer <snitzer@redhat.com>2014-11-10 15:25:27 -0500
commit7a7e97ca580b944d2c89b59bc74a7b9ddd044705 (patch)
tree93ce0a65769205e6330ccf0691777eeaf51011fa /drivers/md/dm-raid.c
parent36f12aeb714fc04752997d6c07b6afb2fa0ac947 (diff)
dm thin: performance improvement to discard processing
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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