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| author | Mikulas Patocka <mpatocka@redhat.com> | 2021-06-15 20:17:35 +0200 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2021-06-15 21:42:03 +0200 |
| commit | 293128b1ef5ae2cfa7403d54e183fe689ed5d303 (patch) | |
| tree | dd349a4d33751ae24bf01896197e05a72ec2ea49 /drivers/md/dm-writecache.c | |
| parent | dm writecache: use list_move instead of list_del/list_add in writecache_write... (diff) | |
| download | linux-293128b1ef5ae2cfa7403d54e183fe689ed5d303.tar.xz linux-293128b1ef5ae2cfa7403d54e183fe689ed5d303.zip | |
dm writecache: have ssd writeback wait if the kcopyd workqueue is busy
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>
Diffstat (limited to 'drivers/md/dm-writecache.c')
| -rw-r--r-- | drivers/md/dm-writecache.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 56179a21db0e..28bb6890fcf4 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -1812,6 +1812,11 @@ static void writecache_writeback(struct work_struct *work) struct writeback_list wbl; unsigned long n_walked; + if (!WC_MODE_PMEM(wc)) { + /* Wait for any active kcopyd work on behalf of ssd writeback */ + dm_kcopyd_client_flush(wc->dm_kcopyd); + } + wc_lock(wc); restart: if (writecache_has_error(wc)) { |