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From: Vivek Goyal on 11 Aug 2010 18:50
o do not idle either on cfq queue or service tree if slice_idle=0. User does
not want any queue or service tree idling. Currently even if slice_idle=0,
we were waiting for request to finish before expiring the queue and that
can lead to lower queue depths.

Signed-off-by: Vivek Goyal <vgoyal(a)redhat.com>
---
block/cfq-iosched.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index eb4086f..8830569 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1839,6 +1839,9 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
BUG_ON(!service_tree);
BUG_ON(!service_tree->count);

+ if (!cfqd->cfq_slice_idle)
+ return false;
+
/* We never do for idle class queues. */
if (prio == IDLE_WORKLOAD)
return false;
@@ -1879,7 +1882,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
/*
* idle is disabled, either manually or by past process history
*/
- if (!cfqd->cfq_slice_idle || !cfq_should_idle(cfqd, cfqq))
+ if (!cfq_should_idle(cfqd, cfqq))
return;

/*
--
1.7.1.1

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Prev: [PATCH -v2] perf, x86: try to handle unknown nmis with running perfctrs
Next: [PATCH 5/5] cfq-iosched: Documentation help for new tunables