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| author | Jens Axboe <axboe@suse.de> | 2006-06-01 10:09:56 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2006-06-01 10:09:56 +0200 |
| commit | 12e9fddd6eb827937fcaac8ac7712c7303898b1f (patch) | |
| tree | b3fbb502f46319808a50fd2fc7a93668d697f6ec /block | |
| parent | e0de0206a2a37cd3e0ba9954d9f863e11d6d1782 (diff) | |
| download | kernel-crypto-12e9fddd6eb827937fcaac8ac7712c7303898b1f.tar.gz kernel-crypto-12e9fddd6eb827937fcaac8ac7712c7303898b1f.tar.xz kernel-crypto-12e9fddd6eb827937fcaac8ac7712c7303898b1f.zip | |
[PATCH] cfq-iosched: Detect idle process issuing async request
If we are anticipating a sync request from this process and we are
waiting for that and see an async request come in, expire that slice
and move on.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index d582433441c..93ba54605ed 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -1747,14 +1747,24 @@ cfq_crq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq, cfqq->next_crq = cfq_choose_req(cfqd, cfqq->next_crq, crq); + cic = crq->io_context; + /* * we never wait for an async request and we don't allow preemption * of an async request. so just return early */ - if (!cfq_crq_is_sync(crq)) + if (!cfq_crq_is_sync(crq)) { + /* + * sync process issued an async request, if it's waiting + * then expire it and kick rq handling. + */ + if (cic == cfqd->active_cic && + del_timer(&cfqd->idle_slice_timer)) { + cfq_slice_expired(cfqd, 0); + cfq_start_queueing(cfqd, cfqq); + } return; - - cic = crq->io_context; + } cfq_update_io_thinktime(cfqd, cic); cfq_update_io_seektime(cfqd, cic, crq); |