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| author | Ming Lei <ming.lei@redhat.com> | 2018-01-11 14:01:56 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-26 11:02:07 +0200 |
| commit | 2e102fe86ede237ca875da9336648caa5e2fcac6 (patch) | |
| tree | 3e6d6d87f0e9a6819913dd0ccf117d78bd41d5e3 /block/blk-mq.c | |
| parent | 223ed638e937c53fdb49c6a55aa3c9de2c728b0f (diff) | |
dm mpath: return DM_MAPIO_REQUEUE on blk-mq rq allocation failure
[ Upstream commit 050af08ffb1b62af69196d61c22a0755f9a3cdbd ]
blk-mq will rerun queue via RESTART or dispatch wake after one request
is completed, so not necessary to wait random time for requeuing, we
should trust blk-mq to do it.
More importantly, we need to return BLK_STS_RESOURCE to blk-mq so that
dequeuing from the I/O scheduler can be stopped, this results in
improved I/O merging.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block/blk-mq.c')
0 files changed, 0 insertions, 0 deletions