| commit | da775265021b61d5eb81df155e36cb0810f6df53 | [log] [tgz] |
|---|---|---|
| author | Jens Axboe <jens.axboe@oracle.com> | Wed Dec 20 11:04:12 2006 +0100 |
| committer | Jens Axboe <jens.axboe@oracle.com> | Wed Dec 20 11:04:12 2006 +0100 |
| tree | f7b28991b281a8c581bd3ab0bb470e158ae2206f | |
| parent | 8e5cfc45e7527eb5c8a9a22d56a7b9227e7c0913 [diff] |
[PATCH] cfq-iosched: don't allow sync merges across queues Currently we allow any merge, even if the io originates from different processes. This can cause really bad starvation and unfairness, if those ios happen to be synchronous (reads or direct writes). So add a allow_merge hook to the io scheduler ops, so an io scheduler can help decide whether a bio/process combination may be merged with an existing request. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>