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Subject[PATCH 13/15] cfq-iosched: never allow an async queue idling
Date
We don't enable it by default, don't let it get enabled during
runtime.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
block/cfq-iosched.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8f76aed..f920527 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1597,7 +1597,12 @@ static void
cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
struct cfq_io_context *cic)
{
- int enable_idle = cfq_cfqq_idle_window(cfqq);
+ int enable_idle;
+
+ if (!cfq_cfqq_sync(cfqq))
+ return;
+
+ enable_idle = cfq_cfqq_idle_window(cfqq);

if (!cic->ioc->task || !cfqd->cfq_slice_idle ||
(cfqd->hw_tag && CIC_SEEKY(cic)))
--
1.5.1.1.190.g74474
-
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