]> git.baikalelectronics.ru Git - kernel.git/commit
Revert "dm cache: do not wake_worker() in free_migration()"
authorMike Snitzer <snitzer@redhat.com>
Wed, 29 Jul 2015 18:11:28 +0000 (14:11 -0400)
committerMike Snitzer <snitzer@redhat.com>
Wed, 29 Jul 2015 18:32:08 +0000 (14:32 -0400)
commitb8726f93474feabc0d8ad0417fe09d0929bc383a
tree46cbef379c3f3b9a37cc59ff2c9fe5fb6c7d6694
parent8c0db7f8262948ceeb413e9bd5690d7946a291bd
Revert "dm cache: do not wake_worker() in free_migration()"

This reverts commit a9a8201757ab2a1813b72282f2f643810214749b.

Taking the wake_worker() out of free_migration() will slow writeback
dramatically, and hence adaptability.

Say we have 10k blocks that need writing back, but are only able to
issue 5 concurrently due to the migration bandwidth: it's imperative
that we wake_worker() immediately after migration completion; waiting
for the next 1 second wake up (via do_waker) means it'll take a long
time to write that all back.

Reported-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-cache-target.c