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authorVasily Tarasov <vtaras@openvz.org>2007-07-20 10:06:38 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-07-20 10:06:38 +0200
commitc2dea2d1fdbce86942dba0a968c523d8b7858bb5 (patch)
treec876b93785ee3b25c341be0dd5080a5176f27736 /include/linux/ioprio.h
parent9a79b2274186fade17134929d4f85b70d59a3840 (diff)
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cfq: async queue allocation per priority
If we have two processes with different ioprio_class, but the same ioprio_data, their async requests will fall into the same queue. I guess such behavior is not expected, because it's not right to put real-time requests and best-effort requests in the same queue. The attached patch fixes the problem by introducing additional *cfqq fields on cfqd, pointing to per-(class,priority) async queues. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/ioprio.h')
-rw-r--r--include/linux/ioprio.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 2eaa142..baf2938 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -53,6 +53,14 @@ static inline int task_ioprio(struct task_struct *task)
return IOPRIO_NORM;
}
+static inline int task_ioprio_class(struct task_struct *task)
+{
+ if (ioprio_valid(task->ioprio))
+ return IOPRIO_PRIO_CLASS(task->ioprio);
+
+ return IOPRIO_CLASS_BE;
+}
+
static inline int task_nice_ioprio(struct task_struct *task)
{
return (task_nice(task) + 20) / 5;