linux-kernel - Re: [PATCH] Repost sched-rt: Reduce rq lock contention by eliminating locking of non-feasible target

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Date:	Thu, 15 Jan 2015 09:13:06 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	Shawn Bohrer <sbohrer@...advisors.com>,
	Suruchi Kadu <suruchi.a.kadu@...el.com>,
	Doug Nelson <doug.nelson@...el.com>,
	linux-kernel@...r.kernel.org, Juri Lelli <juri.lelli@...il.com>
Subject: Re: [PATCH] Repost sched-rt: Reduce rq lock contention by
 eliminating locking of non-feasible target

On Tue, 2015-01-06 at 20:30 +0100, Peter Zijlstra wrote:
> On Tue, Jan 06, 2015 at 11:01:51AM -0800, Tim Chen wrote:
> > Didn't get any response for this patch probably due to the holidays.
> > Reposting it as we will like to get it merged to help our database
> > workload.
> > 
> > This patch added checks that prevent futile attempts to move rt tasks
> > to 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%.
> 
> Don't immediately see anything wrong with this, Steve?

Steve, do you have any objections to this patch?  Thanks.

Tim


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