linux-kernel - Re: [patch] x86: avoid unnecessary smp alternatives switch during suspend/resume

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Message-ID: <20101121060251.GD9099@hack>
Date:	Sun, 21 Nov 2010 14:02:51 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [patch] x86: avoid unnecessary smp alternatives switch during
	suspend/resume

On Fri, Nov 19, 2010 at 04:09:24PM -0800, Suresh Siddha wrote:
>During suspend, we disable all the non boot cpus. And during resume we bring
>them all back again. So no need to do alternatives_smp_switch() in between.
>
>This speeds up both suspend and resume paths.
>
>Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>

This is a cool idea!

The patch looks good for me, just note that kexec
also calls disable_nonboot_cpus(), so the name 'pm_sleep_smp'
is a bit confused. ;)

Reviewed-by: WANG Cong <xiyou.wangcong@...il.com>

Thanks!

-- 
Live like a child, think like the god.
 
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