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authorWu Fengguang <fengguang.wu@intel.com>2009-10-09 12:40:42 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-10-09 12:40:42 +0200
commitd25105e8911bff1dbd68e387f12901c5b1a15fe8 (patch)
treebcb94e898b9f3b0322db74473e4dd319a16308e2
parent8c279598585e4992a41016bb973993ed15888cb3 (diff)
writeback: account IO throttling wait as iowait
It makes sense to do IOWAIT when someone is blocked due to IO throttle, as suggested by Kame and Peter. There is an old comment for not doing IOWAIT on throttle, however it has been mismatching the code for a long time. If we stop accounting IOWAIT for 2.6.32, it could be an undesirable behavior change. So restore the io_schedule. CC: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> CC: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--kernel/sched.c3
-rw-r--r--mm/page-writeback.c3
2 files changed, 2 insertions, 4 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 1535f3884b8..074f753f744 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6720,9 +6720,6 @@ EXPORT_SYMBOL(yield);
/*
* This task is about to go to sleep on IO. Increment rq->nr_iowait so
* that process accounting knows that this is a task in IO wait state.
- *
- * But don't do that if it is a deliberate, throttling IO wait (this task
- * has set its backing_dev_info: the queue against which it should throttle)
*/
void __sched io_schedule(void)
{
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index a3b14090b1f..2c5d79236ea 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -566,7 +566,8 @@ static void balance_dirty_pages(struct address_space *mapping,
if (pages_written >= write_chunk)
break; /* We've done our duty */
- schedule_timeout_interruptible(pause);
+ __set_current_state(TASK_INTERRUPTIBLE);
+ io_schedule_timeout(pause);
/*
* Increase the delay for each loop, up to our previous