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(parent: 76dc891) | patch
block: prevent merging of requests with different priorities
authorDamien Le Moal <damien.lemoal@wdc.com>
Tue, 20 Nov 2018 01:52:37 +0000 (10:52 +0900)
committerJens Axboe <axboe@kernel.dk>
Tue, 20 Nov 2018 02:03:49 +0000 (19:03 -0700)
commit668ffc03418bc779f699797c72ecf968cd6525a9
tree1392526ca5bb0cbe189e7d5ff5d469c51d2ef231tree | snapshot
parent76dc891395dc61e92e2ff31b6161815ce5eb715bcommit | diff
block: prevent merging of requests with different priorities

Growing in size a high priority request by merging it with a lower
priority BIO or request will increase the request execution time. This
is the opposite result of the desired effect of high I/O priorities,
namely getting low I/O latencies. Prevent merging of requests and BIOs
that have different I/O priorities to fix this.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/blk-core.c diff | blob | history
block/blk-merge.c diff | blob | history
Domain: System / Kernel;