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From: Richard Henderson <rth@twiddle.net>
To: Peter Zijlstra <peterz@infradead.org>,
	mingo@kernel.org, tglx@linutronix.de, luto@amacapital.net,
	nicolas.pitre@linaro.org, daniel.lezcano@linaro.org,
	umgwanakikbuti@gmail.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 1/8] sched,idle,alpha: Switch from TS_POLLING to TIF_POLLING_NRFLAG
Date: Fri, 11 Apr 2014 07:38:14 -0700	[thread overview]
Message-ID: <5347FE56.5000206@twiddle.net> (raw)
In-Reply-To: <20140411135218.181563050@infradead.org>

On 04/11/2014 06:42 AM, Peter Zijlstra wrote:
> Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that
> both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word.
> This will allow us, using fetch_or(), to both set NEED_RESCHED and
> check for POLLING_NRFLAG in a single operation and avoid pointless
> wakeups.
> 
> Changing from the non-atomic thread_info::status flags to the atomic
> thread_info::flags shouldn't be a big issue since most polling state
> changes were followed/preceded by a full memory barrier anyway.
> 
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Richard Henderson <rth@twiddle.net>
> Signed-off-by: Peter Zijlstra <peterz@infradead.org>
> ---
>  arch/alpha/include/asm/thread_info.h |    4 ++--
>  1 file changed, 2 inser

Acked-by: Richard Henderson <rth@twiddle.net>


r~

  reply	other threads:[~2014-04-11 14:38 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-11 13:42 [RFC][PATCH 0/8] sched,idle: need resched polling rework Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 1/8] sched,idle,alpha: Switch from TS_POLLING to TIF_POLLING_NRFLAG Peter Zijlstra
2014-04-11 14:38   ` Richard Henderson [this message]
2014-04-11 13:42 ` [RFC][PATCH 2/8] sched,idle,tile: " Peter Zijlstra
2014-04-11 15:15   ` Chris Metcalf
2014-04-11 15:30     ` Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 3/8] sched,idle,ia64: " Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 4/8] sched,idle,x86: " Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 5/8] sched,idle: Remove TS_POLLING support Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs Peter Zijlstra
2014-04-13 21:41   ` Nicolas Pitre
2014-05-09 13:37   ` James Hogan
2014-05-09 14:15     ` Peter Zijlstra
2014-05-09 14:40       ` Catalin Marinas
2014-05-09 14:50         ` Peter Zijlstra
2014-05-09 14:57           ` Catalin Marinas
2014-05-09 17:02             ` Peter Zijlstra
2014-05-09 17:06               ` Peter Zijlstra
2014-05-09 17:09                 ` Catalin Marinas
2014-05-09 17:20                   ` Peter Zijlstra
2014-05-19 12:54                 ` [tip:sched/arch] arm64: Remove TIF_POLLING_NRFLAG tip-bot for Peter Zijlstra
2014-05-22 12:26                 ` [tip:sched/core] " tip-bot for Peter Zijlstra
2014-05-09 14:51       ` [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs James Hogan
2014-05-15  9:17         ` James Hogan
2014-05-19 12:54         ` [tip:sched/arch] metag: Remove TIF_POLLING_NRFLAG tip-bot for James Hogan
2014-05-22 12:26         ` [tip:sched/core] " tip-bot for James Hogan
2014-04-11 13:42 ` [RFC][PATCH 7/8] sched,idle: Delay clearing the polling bit Peter Zijlstra
2014-04-13 21:51   ` Nicolas Pitre
2014-04-11 13:42 ` [RFC][PATCH 8/8] sched,idle: Reflow cpuidle_idle_call() Peter Zijlstra
2014-04-13 21:36   ` Nicolas Pitre
2014-04-14  8:59     ` Peter Zijlstra
2014-04-14  9:25       ` Peter Zijlstra
2014-04-14 13:55         ` Nicolas Pitre
2014-04-11 15:00 ` [RFC][PATCH 0/8] sched,idle: need resched polling rework Andy Lutomirski
2014-04-11 15:14   ` Peter Zijlstra
2014-05-22 12:58   ` Peter Zijlstra
2014-05-22 13:09     ` Peter Zijlstra
2014-05-29  0:01       ` Andy Lutomirski
2014-05-29  6:48         ` Peter Zijlstra
2014-06-03  6:40           ` Andy Lutomirski
2014-06-03  6:51             ` Peter Zijlstra
2014-06-03 10:43             ` Peter Zijlstra
2014-06-03 14:02               ` Peter Zijlstra
2014-06-03 16:05                 ` Andy Lutomirski
2014-06-03 16:19                   ` Peter Zijlstra
2014-06-03 16:52                     ` Andy Lutomirski
2014-06-03 17:00                       ` Peter Zijlstra
2014-06-03 18:28                         ` Peter Zijlstra
2014-06-03 18:44                           ` Andy Lutomirski
2014-06-03 20:07                             ` Andy Lutomirski
2014-04-12  8:35 ` Mike Galbraith

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