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author | Mikulas Patocka <mpatocka@redhat.com> | 2014-10-01 13:29:48 -0400 |
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committer | Mike Snitzer <snitzer@redhat.com> | 2014-10-05 20:03:37 -0400 |
commit | 0e825862f3c04cee40e25f55680333728a4ffa9b (patch) | |
tree | a036fac4e4bee64b32f71924b31acaf000184787 /drivers/md/dm-log-userspace-transfer.c | |
parent | eb76faf53b1ff7a77ce3f78cc98ad392ac70c2a0 (diff) | |
download | op-kernel-dev-0e825862f3c04cee40e25f55680333728a4ffa9b.zip op-kernel-dev-0e825862f3c04cee40e25f55680333728a4ffa9b.tar.gz |
dm bufio: when done scanning return from __scan immediately
When __scan frees the required number of buffer entries that the
shrinker requested (nr_to_scan becomes zero) it must return. Before
this fix the __scan code exited only the inner loop and continued in the
outer loop -- which could result in reduced performance due to extra
buffers being freed (e.g. unnecessarily evicted thinp metadata needing
to be synchronously re-read into bufio's cache).
Also, move dm_bufio_cond_resched to __scan's inner loop, so that
iterating the bufio client's lru lists doesn't result in scheduling
latency.
Reported-by: Joe Thornber <thornber@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 3.2+
Diffstat (limited to 'drivers/md/dm-log-userspace-transfer.c')
0 files changed, 0 insertions, 0 deletions