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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-11-07 09:46:13 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-11-07 09:46:13 +0100 |
| commit | b70c864d3ce706571d2f3cac1d35d4fba01d6072 (patch) | |
| tree | fbdab2c4ddf484e5344b8cc00e4bc24b6e443191 /scripts/patch-kernel | |
| parent | cfq: fix IOPRIO_CLASS_IDLE accounting (diff) | |
| download | linux-b70c864d3ce706571d2f3cac1d35d4fba01d6072.tar.gz linux-b70c864d3ce706571d2f3cac1d35d4fba01d6072.zip | |
cfq: fix IOPRIO_CLASS_IDLE delays
After the fresh boot:
ionice -c3 -p $$
echo cfq >> /sys/block/XXX/queue/scheduler
dd if=/dev/XXX of=/dev/null bs=512 count=1
Now dd hangs in D state and the queue is completely stalled for approximately
INITIAL_JIFFIES + CFQ_IDLE_GRACE jiffies. This is because cfq_init_queue()
forgets to initialize cfq_data->last_end_request.
(I guess this patch is not complete, overflow is still possible)
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'scripts/patch-kernel')
0 files changed, 0 insertions, 0 deletions