| commit | 1e3335de05da3dfbe48b8caa03db1834a2133256 | |
| author | Jens Axboe <jens.axboe@oracle.com> | |
| Wed, 14 Feb 2007 18:59:49 +0000 (14 19:59 +0100) | ||
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | |
| Mon, 30 Apr 2007 07:01:21 +0000 (30 09:01 +0200) | ||
| tree | 3783ea1ef788f564a78754906dc508ac66595b75 | treesnapshot (tar.gz zip) |
| parent | b9099ff63c75216d6ca10bce5a1abcd9293c27e6 | commitdiff |
cfq-iosched: improve preemption for cooperating tasks
When testing the syslet async io approach, I discovered that CFQ
sometimes didn't perform as well as expected. cfq_should_preempt()
needs to better check for cooperating tasks, so fix that by allowing
preemption of an equal priority queue if the recently queued request
is as good a candidate for IO as the one we are currently waiting for.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
When testing the syslet async io approach, I discovered that CFQ
sometimes didn't perform as well as expected. cfq_should_preempt()
needs to better check for cooperating tasks, so fix that by allowing
preemption of an equal priority queue if the recently queued request
is as good a candidate for IO as the one we are currently waiting for.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| block/cfq-iosched.c | diffblobblamehistory |