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

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Date:	Sun, 21 Nov 2010 11:03:28 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Nigel Cunningham <lkml@...elcunningham.com.au>
Cc:	Suresh Siddha <suresh.b.siddha@...el.com>,
	"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 Sun, Nov 21, 2010 at 08:27:41PM +1100, Nigel Cunningham wrote:
> Hi.
> 
> We have a few others things that want to modify their behaviour
> according to whether we're doing the atomic copy/restore. Perhaps it
> would be an idea to just use a single flag, perhaps a value for
> system_state?

I agree, it would be nicer if we don't introduce a special flag
just for that. Other than that, I like all sane code that speeds up
suspend/resume :). I've attached before/after dmesg excerpts on my
system with the patch ontop of v2.6.37-rc2-181-gb86db47. We end up
saving 11601 µsecs according to CONFIG_PRINTK_TIME but hey, the code is
simple enough :).

Tested-by: Borislav Petkov <bp@...en8.de>

Thanks.

-- 
Regards/Gruss,
    Boris.

View attachment "suspend.before" of type "text/plain" (1598 bytes)

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