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authorCorrado Zoccolo <czoccolo@gmail.com>2010-09-20 15:24:50 +0200
committerJens Axboe <jaxboe@fusionio.com>2010-09-20 15:24:50 +0200
commit749ef9f8423054e326f3a246327ed2db4b6d395f (patch)
tree388df763e4e731f5d9b4d8dcaedca641521571e3 /block/blk-exec.c
parent6d0aed7a38d06284db2a0e46c0a072b0c1c3299b (diff)
cfq: improve fsync performance for small files
Fsync performance for small files achieved by cfq on high-end disks is lower than what deadline can achieve, due to idling introduced between the sync write happening in process context and the journal commit. Moreover, when competing with a sequential reader, a process writing small files and fsync-ing them is starved. This patch fixes the two problems by: - marking journal commits as WRITE_SYNC, so that they get the REQ_NOIDLE flag set, - force all queues that have REQ_NOIDLE requests to be put in the noidle tree. Having the queue associated to the fsync-ing process and the one associated to journal commits in the noidle tree allows: - switching between them without idling, - fairness vs. competing idling queues, since they will be serviced only after the noidle tree expires its slice. Acked-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Tested-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block/blk-exec.c')
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