Joe Thornber 7a7e97ca58
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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