From: Zefan Li <lizefan@huawei.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: tip-bot for Tim Chen <tipbot@zytor.com>,
<suruchi.a.kadu@intel.com>, <linux-kernel@vger.kernel.org>,
<sbohrer@rgmadvisors.com>, <peterz@infradead.org>,
<mingo@kernel.org>, <tglx@linutronix.de>, <doug.nelson@intel.com>,
<torvalds@linux-foundation.org>, <tim.c.chen@linux.intel.com>,
<hpa@zytor.com>, <stable@vger.kernel.org>,
Clark Williams <williams@redhat.com>
Subject: Re: [tip:sched/core] sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target
Date: Thu, 9 Apr 2015 09:17:55 +0800 [thread overview]
Message-ID: <5525D343.3080408@huawei.com> (raw)
In-Reply-To: <20150224111247.2ca122c3@gandalf.local.home>
>> Commit-ID: 80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Gitweb: http://git.kernel.org/tip/80e3d87b2c5582db0ab5e39610ce3707d97ba409
>> Author: Tim Chen <tim.c.chen@linux.intel.com>
>> AuthorDate: Fri, 12 Dec 2014 15:38:12 -0800
>> Committer: Ingo Molnar <mingo@kernel.org>
>> CommitDate: Fri, 30 Jan 2015 19:38:49 +0100
>>
>> sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target
>>
>> This patch adds checks that prevens futile attempts to move rt tasks
>> to a CPU with active tasks of equal or higher priority.
>>
>> This reduces run queue lock contention and improves the performance of
>> a well known OLTP benchmark by 0.7%.
>>
>> Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
>> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
>> Cc: Shawn Bohrer <sbohrer@rgmadvisors.com>
>> Cc: Suruchi Kadu <suruchi.a.kadu@intel.com>
>> Cc: Doug Nelson<doug.nelson@intel.com>
>> Cc: Steven Rostedt <rostedt@goodmis.org>
>> Cc: Linus Torvalds <torvalds@linux-foundation.org>
>> Link: http://lkml.kernel.org/r/1421430374.2399.27.camel@schen9-desk2.jf.intel.com
>> Signed-off-by: Ingo Molnar <mingo@kernel.org>
>
> I see this has been added to mainline already. I think this should go
> to stable as well. As far back as it applies. I'll even add this to the
> stable-rt if need be. But I rather pull it into stable-rt via the
> stable branches.
>
Queued up for 3.4. Thanks!
prev parent reply other threads:[~2015-04-09 1:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1421430374.2399.27.camel@schen9-desk2.jf.intel.com>
[not found] ` <tip-80e3d87b2c5582db0ab5e39610ce3707d97ba409@git.kernel.org>
2015-02-24 16:12 ` [tip:sched/core] sched/rt: Reduce rq lock contention by eliminating locking of non-feasible target Steven Rostedt
2015-03-03 21:12 ` Ben Hutchings
2015-04-09 1:17 ` Zefan Li [this message]
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