dm writecache: have ssd writeback wait if the kcopyd workqueue is busy

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Make dm-writecache wait if the kcopyd workqueue is busy (as will
happen if waiting for page allocation or inside submit_bio).

This change improves performance of "mkfs.ext2" by approximately 20%
on one testbed.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Mikulas Patocka 2021-06-15 14:17:35 -04:00 • committed by Mike Snitzer

parent 8c77f1cb84

commit 293128b1ef

3 changed files with 12 additions and 0 deletions

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include/linux/dm-kcopyd.h

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