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authorJens Axboe <jens.axboe@oracle.com>2009-06-30 09:34:12 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-07-01 10:56:25 +0200
commit6118b70b3a0b4c583439bb77600194c82f220ce3 (patch)
tree6966f1b059f1bdadc0d679067796d9b4bf9a22c3 /Documentation
parentd5036d770f871bd34c9cfd955e6dee692e1e8e81 (diff)
downloadlinux-6118b70b3a0b4c583439bb77600194c82f220ce3.tar.bz2
cfq-iosched: get rid of the need for __GFP_NOFAIL in cfq_find_alloc_queue()
Setup an emergency fallback cfqq that we allocate at IO scheduler init time. If the slab allocation fails in cfq_find_alloc_queue(), we'll just punt IO to that cfqq instead. This ensures that cfq_find_alloc_queue() never fails without having to ensure free memory. On cfqq lookup, always try to allocate a new cfqq if the given cfq io context has the oom_cfqq assigned. This ensures that we only temporarily punt to this shared queue. Reviewed-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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