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| author | Jens Axboe <axboe@suse.de> | 2006-06-14 09:10:45 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-06-23 17:10:39 +0200 |
| commit | 35e6077cb16f93517ba5a51ba849b186d2474d60 (patch) | |
| tree | 215bcf3548d80365b3cd3673feddf6a8f8ba9fbc /block/cfq-iosched.c | |
| parent | b17fd9bceb99610f6dc7998c9a4ed6b71520be2b (diff) | |
| download | lwn-35e6077cb16f93517ba5a51ba849b186d2474d60.tar.gz lwn-35e6077cb16f93517ba5a51ba849b186d2474d60.zip | |
[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/cfq-iosched.c')
| -rw-r--r-- | block/cfq-iosched.c | 5 |
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); } } |