linux-kernel - Re: [PATCH v2 5/5] sched, timer: Use the atomic task_cputime in thread_group

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Message-ID: <5540EF29.6010105@redhat.com>
Date:	Wed, 29 Apr 2015 10:48:09 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jason Low <jason.low2@...com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
CC:	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Waiman Long <Waiman.Long@...com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>
Subject: Re: [PATCH v2 5/5] sched, timer: Use the atomic task_cputime in thread_group_cputimer

On 04/28/2015 04:00 PM, Jason Low wrote:
> Recent optimizations were made to thread_group_cputimer to improve its
> scalability by keeping track of cputime stats without a lock. However,
> the values were open coded to the structure, causing them to be at
> a different abstraction level from the regular task_cputime structure.
> Furthermore, any subsequent similar optimizations would not be able to
> share the new code, since they are specific to thread_group_cputimer.
>
> This patch adds the new task_cputime_atomic data structure (introduced in
> the previous patch in the series) to thread_group_cputimer for keeping
> track of the cputime atomically, which also helps generalize the code.
>
> Suggested-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Jason Low <jason.low2@...com>

Acked-by: Rik van Riel <riel@...hat.com>

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