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author | Jens Axboe <axboe@suse.de> | 2005-06-27 10:56:24 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-27 14:33:30 -0700 |
commit | 3b18152c327707ae6a2eeba4cfb66457143753bc (patch) | |
tree | 5cdf299af4119762c036cc98a09e23458e0b37fa /drivers/block/cciss.c | |
parent | 3d25f3566bb606720a67caef77b16190df10dd98 (diff) | |
download | op-kernel-dev-3b18152c327707ae6a2eeba4cfb66457143753bc.zip op-kernel-dev-3b18152c327707ae6a2eeba4cfb66457143753bc.tar.gz |
[PATCH] CFQ io scheduler updates
- Adjust slice values
- Instead of one async queue, one is defined per priority level. This
prevents kernel threads (such as reiserfs/x and others) that run at
higher io priority from conflicting with others. Previously, it was a
coin toss what io prio the async queue got, it was defined by who
first set up the queue.
- Let a time slice only begin, when the previous slice is completely
done. Previously we could be somewhat unfair to a new sync slice, if
the previous slice was async and had several ios queued. This might
need a little tweaking if throughput suffers a little due to this,
allowing perhaps an overlap of a single request or so.
- Optimize the calling of kblockd_schedule_work() by doing it only when
it is strictly necessary (no requests in driver and work left to do).
- Correct sync vs async logic. A 'normal' process can be purely async as
well, and a flusher can be purely sync as well. Sync or async is now a
property of the class defined and requests pending. Previously writers
could be considered sync, when they were really async.
- Get rid of the bit fields in cfqq and crq, use flags instead.
- Various other cleanups and fixes
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/block/cciss.c')
0 files changed, 0 insertions, 0 deletions