From: Vivek Goyal Date: Thu, 9 Jul 2009 20:13:16 +0000 (+0200) Subject: cfq-iosched: reset oom_cfqq in cfq_set_request() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=32f2e807a3938b24d0831211e6094f9e44b2fc83;p=openwrt%2Fstaging%2Fblogic.git cfq-iosched: reset oom_cfqq in cfq_set_request() In case memory is scarce, we now default to oom_cfqq. Once memory is available again, we should allocate a new cfqq and stop using oom_cfqq for a particular io context. Once a new request comes in, check if we are using oom_cfqq, and if yes, try to allocate a new cfqq. Tested the patch by forcing the use of oom_cfqq and upon next request thread realized that it was using oom_cfqq and it allocated a new cfqq. Signed-off-by: Vivek Goyal Signed-off-by: Jens Axboe --- diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 87276eb83f7f..fd7080ed7935 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -2311,7 +2311,7 @@ cfq_set_request(struct request_queue *q, struct request *rq, gfp_t gfp_mask) goto queue_fail; cfqq = cic_to_cfqq(cic, is_sync); - if (!cfqq) { + if (!cfqq || cfqq == &cfqd->oom_cfqq) { cfqq = cfq_get_queue(cfqd, is_sync, cic->ioc, gfp_mask); cic_set_cfqq(cic, cfqq, is_sync); }