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| author | Bart Van Assche <bart.vanassche@sandisk.com> | 2017-04-07 16:50:44 -0700 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2017-04-24 15:06:19 -0400 |
| commit | 06eb061f48594aa369f6e852b352410298b317a8 (patch) | |
| tree | 02c868ed14c9682c49a4f469edad71d730413fd8 /drivers/md/md.c | |
| parent | 117aceb030307dcd431fdcff87ce988d3016c34a (diff) | |
dm mpath: requeue after a small delay if blk_get_request() fails
If blk_get_request() returns ENODEV then multipath_clone_and_map()
causes a request to be requeued immediately. This can cause a kworker
thread to spend 100% of the CPU time of a single core in
__blk_mq_run_hw_queue() and also can cause device removal to never
finish.
Avoid this by only requeuing after a delay if blk_get_request() fails.
Additionally, reduce the requeue delay.
Cc: stable@vger.kernel.org # 4.9+
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/md.c')
0 files changed, 0 insertions, 0 deletions