[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1285633798-26886-4-git-send-email-ncrao@google.com>
Date: Mon, 27 Sep 2010 17:29:58 -0700
From: Nikhil Rao <ncrao@...gle.com>
To: Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
Mike Galbraith <efault@....de>
Cc: Venkatesh Pallipadi <venki@...gle.com>,
linux-kernel@...r.kernel.org, Nikhil Rao <ncrao@...gle.com>
Subject: [PATCH 3/3] sched: do not consider SCHED_IDLE tasks to be cache hot
This patch adds a check in task_hot to return if the task has SCHED_IDLE
policy. SCHED_IDLE tasks have very low weight, and when run with regular
weight tasks, are typically scheduled many milliseconds apart. There is no
benefit from considering SCHED_IDLE tasks cache hot for load balancing.
Signed-off-by: Nikhil Rao <ncrao@...gle.com>
---
kernel/sched.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index ed09d4f..874efde 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2003,6 +2003,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
if (p->sched_class != &fair_sched_class)
return 0;
+ if (p->policy == SCHED_IDLE)
+ return 0;
+
/*
* Buddy candidates are cache hot:
*/
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists