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authorJens Axboe <axboe@suse.de>2006-06-14 09:10:45 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-06-23 17:10:39 +0200
commit35e6077cb16f93517ba5a51ba849b186d2474d60 (patch)
tree215bcf3548d80365b3cd3673feddf6a8f8ba9fbc /block
parentb17fd9bceb99610f6dc7998c9a4ed6b71520be2b (diff)
downloadlinux-linaro-stable-35e6077cb16f93517ba5a51ba849b186d2474d60.tar.gz
[PATCH] cfq-iosched: correctly set ioprio on both targets
Patch originally from Vasily Tarasov <vtaras@sw.ru> If you set io-priority of process 1 using sys_ioprio_set system call by another process 2 (like ionice do), then cfq_init_prio_data() function sets priority of process 2 (current) on queue of process 1 and clears the flag, that designates change of ioprio. So the process 1 will work like with priority of process 2. I propose not to call cfq_init_prio_data() on io-priority change, but only mark queue as queue with changed prority. Every time when new request comes cfq-scheduler checks for this flag and atomaticaly changes priority of queue to new value. Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 4c4e9cc3ae26..84b75f88c279 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1388,10 +1388,9 @@ static inline void changed_ioprio(struct cfq_io_context *cic)
}
}
cfqq = cic->cfqq[SYNC];
- if (cfqq) {
+ if (cfqq)
cfq_mark_cfqq_prio_changed(cfqq);
- cfq_init_prio_data(cfqq);
- }
+
spin_unlock(cfqd->queue->queue_lock);
}
}