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authorJens Axboe <jens.axboe@oracle.com>2006-12-20 11:04:12 +0100
committerJens Axboe <jens.axboe@oracle.com>2006-12-20 11:04:12 +0100
commitda775265021b61d5eb81df155e36cb0810f6df53 (patch)
treef7b28991b281a8c581bd3ab0bb470e158ae2206f /include/scsi/sg.h
parent8e5cfc45e7527eb5c8a9a22d56a7b9227e7c0913 (diff)
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[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>
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