linux-kernel - Re: [RFC 2/2] x86_64, mm: Reinsert the absent memory

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Message-ID: <51CB06BD.8090202@sgi.com>
Date:	Wed, 26 Jun 2013 10:20:29 -0500
From:	Nathan Zimmer <nzimmer@....com>
To:	Dave Hansen <dave.hansen@...el.com>
CC:	Ingo Molnar <mingo@...nel.org>, <holt@....com>, <travis@....com>,
	<rob@...dley.net>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>, <yinghai@...nel.org>, <akpm@...ux-foundation.org>,
	<gregkh@...uxfoundation.org>, <x86@...nel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC 2/2] x86_64, mm: Reinsert the absent memory

On 06/26/2013 10:12 AM, Dave Hansen wrote:
> On 06/26/2013 07:49 AM, Nathan Zimmer wrote:
>> My guess it is the NMIs overwhelming the system but I have not found a good way
>> to profile perf gone wild so it is only a guess.
> I've got an 80-core system and the symptoms sound similar to perf issues
> I'm seeing.  Dropping the sample rate helped for me, and there's a patch
> in -tip at the moment to do it automatically:
>
>> http://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=14c63f17b1fde5a575a28e96547a22b451c71fb5
> Looks like you've also found that debugging NMIs is fun. :)
More fun then one person can handle.
I'll have to take this patch for a spin.

Thanks,
     Nate
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