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

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Message-ID: <87tyjcj6rx.fsf@gmail.com>
Date:	Sat, 20 Nov 2010 11:31:46 -0500
From:	Ben Gamari <bgamari@...il.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Cc:	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, 19 Nov 2010 16:09:24 -0800, Suresh Siddha <suresh.b.siddha@...el.com> 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.
> 
Do you have typical before/after values? Is the change on the order of
microseconds, hundreds of milliseconds, or somewhere in between? It
might be good to note this in the changelog.

- Ben
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