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 <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
liveeasily · Jul 10, 2009 · 32f2e80 · 32f2e80
1 parent ecb554a
commit 32f2e80
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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);
 	}