diff options
author | Ming Lei <ming.lei@redhat.com> | 2018-07-02 17:35:59 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 08:38:13 +0200 |
commit | 07a252b478fb1321021931cae559a0573c141ab9 (patch) | |
tree | f4856e07e2fb40f8656a7afe7c0a2c2f7c7e5458 /certs | |
parent | 2f9cd8588241f725fbe0c8cc56c1bd7e092e7b48 (diff) |
blk-mq: only attempt to merge bio if there is rq in sw queue
[ Upstream commit b04f50ab8a74129b3041a2836c33c916be3c6667 ]
Only attempt to merge bio iff the ctx->rq_list isn't empty, because:
1) for high-performance SSD, most of times dispatch may succeed, then
there may be nothing left in ctx->rq_list, so don't try to merge over
sw queue if it is empty, then we can save one acquiring of ctx->lock
2) we can't expect good merge performance on per-cpu sw queue, and missing
one merge on sw queue won't be a big deal since tasks can be scheduled from
one CPU to another.
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Tested-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reported-by: Kashyap Desai <kashyap.desai@broadcom.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'certs')
0 files changed, 0 insertions, 0 deletions