linux-kernel - Re: [RFC PATCH] sched, timer: Use atomics for thread_group

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Message-ID: <20150126171200.GB23038@twins.programming.kicks-ass.net>
Date:	Mon, 26 Jan 2015 18:12:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Low <jason.low2@...com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] sched, timer: Use atomics for thread_group_cputimer
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On Fri, Jan 23, 2015 at 03:45:55PM -0800, Jason Low wrote:
> On a side note, if we just move the cputimer->running = 1 to after the
> call to update_gt_cputime in thread_group_cputimer(), then we don't have
> to worry about concurrent adds occuring in this function?

Yeah, maybe.. There are a few races there, but I figure that because we
already test cputimer->running outside of cputimer->lock they're already
possible.

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