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From: Laura Abbott <lauraa@codeaurora.org>
To: "Wang, Yalin" <Yalin.Wang@sonymobile.com>,
	"'arnd@arndb.de'" <arnd@arndb.de>,
	"'linux-arch@vger.kernel.org'" <linux-arch@vger.kernel.org>,
	"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
	"'linux@arm.linux.org.uk'" <linux@arm.linux.org.uk>,
	"'linux-arm-kernel@lists.infradead.org'"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC] change non-atomic bitops method
Date: Mon, 02 Feb 2015 10:53:16 -0800	[thread overview]
Message-ID: <54CFC79C.2040005@codeaurora.org> (raw)
In-Reply-To: <35FD53F367049845BC99AC72306C23D1044A02027E0A@CNBJMBX05.corpusers.net>

On 2/1/2015 7:55 PM, Wang, Yalin wrote:
> This patch change non-atomic bitops,
> add a if() condition to test it, before set/clear the bit.
> so that we don't need dirty the cache line, if this bit
> have been set or clear. On SMP system, dirty cache line will
> need invalidate other processors cache line, this will have
> some impact on SMP systems.
>

Any actual numbers to give an idea of the impact?

Thanks,
Laura


-- 
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

WARNING: multiple messages have this Message-ID (diff)
From: lauraa@codeaurora.org (Laura Abbott)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC] change non-atomic bitops method
Date: Mon, 02 Feb 2015 10:53:16 -0800	[thread overview]
Message-ID: <54CFC79C.2040005@codeaurora.org> (raw)
In-Reply-To: <35FD53F367049845BC99AC72306C23D1044A02027E0A@CNBJMBX05.corpusers.net>

On 2/1/2015 7:55 PM, Wang, Yalin wrote:
> This patch change non-atomic bitops,
> add a if() condition to test it, before set/clear the bit.
> so that we don't need dirty the cache line, if this bit
> have been set or clear. On SMP system, dirty cache line will
> need invalidate other processors cache line, this will have
> some impact on SMP systems.
>

Any actual numbers to give an idea of the impact?

Thanks,
Laura


-- 
Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

  reply	other threads:[~2015-02-02 18:53 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-02  3:55 [RFC] change non-atomic bitops method Wang, Yalin
2015-02-02  3:55 ` Wang, Yalin
2015-02-02 18:53 ` Laura Abbott [this message]
2015-02-02 18:53   ` Laura Abbott
2015-02-02 19:31 ` Uwe Kleine-König
2015-02-02 19:31   ` Uwe Kleine-König
2015-02-03 15:14   ` David Howells
2015-02-03 15:14     ` David Howells
2015-02-03 15:14     ` David Howells
2015-02-03 19:10     ` Uwe Kleine-König
2015-02-03 19:10       ` Uwe Kleine-König
2015-02-02 23:29 ` Andrew Morton
2015-02-02 23:29   ` Andrew Morton
2015-02-02 23:31   ` Russell King - ARM Linux
2015-02-02 23:31     ` Russell King - ARM Linux
2015-02-03  1:17   ` Kirill A. Shutemov
2015-02-03  1:17     ` Kirill A. Shutemov
2015-02-03  2:13     ` Wang, Yalin
2015-02-03  2:13       ` Wang, Yalin
2015-02-03  5:42       ` Wang, Yalin
2015-02-03  5:42         ` Wang, Yalin
2015-02-03  6:38         ` Andrew Morton
2015-02-03  6:38           ` Andrew Morton
2015-02-03  7:03           ` Wang, Yalin
2015-02-03  7:03             ` Wang, Yalin
2015-02-03  8:42             ` Wang, Yalin
2015-02-03  8:42               ` Wang, Yalin
2015-02-03 10:59               ` Andrew Morton
2015-02-03 10:59                 ` Andrew Morton
2015-02-09  8:18                 ` Wang, Yalin
2015-02-09  8:18                   ` Wang, Yalin
2015-02-09 20:34                   ` Andrew Morton
2015-02-09 20:34                     ` Andrew Morton
2015-02-10  7:05                     ` Wang, Yalin
2015-02-10  7:05                       ` Wang, Yalin
2015-02-09 21:42                   ` Rasmus Villemoes
2015-02-09 21:42                     ` Rasmus Villemoes
2015-02-09 21:42                     ` Rasmus Villemoes
2015-02-03  8:40           ` David Miller
2015-02-03  8:40             ` David Miller
2015-02-03  8:48             ` Andrew Morton
2015-02-03  8:48               ` Andrew Morton
2015-02-03  9:34           ` Rasmus Villemoes
2015-02-03  9:34             ` Rasmus Villemoes
2015-02-03  9:34             ` Rasmus Villemoes
2015-02-03  9:41             ` Wang, Yalin
2015-02-03  9:41               ` Wang, Yalin
2015-02-03 10:39     ` Kirill A. Shutemov
2015-02-03 10:39       ` Kirill A. Shutemov

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