linux-kernel - Re: pipe/page fault oddness.

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Message-ID: <542EC880.7040006@oracle.com>
Date:	Fri, 03 Oct 2014 12:02:08 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michel Lespinasse <walken@...gle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: pipe/page fault oddness.

On 10/03/2014 11:58 AM, Dave Jones wrote:
> On Fri, Oct 03, 2014 at 08:43:57AM -0700, Linus Torvalds wrote:
>  > On Thu, Oct 2, 2014 at 10:00 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>  > >
>  > > For the record, I tweaked the environment to put some more pressure on the
>  > > scheduler and found out what broke (which is not related to this thread at
>  > > all).
>  > 
>  > Ok. It's probably still worth testing Mel's patches, since that's what
>  > goes into 3.17. But it would be interesting to eventually go back to
>  > stability-testing the protnone set, since it *looked* like it was
>  > working well aside from this issue. I might decide to just do it
>  > during the 3.18 merge window..

Linus, I'm running with Mel's patches since yesterday, nothing interesting
to report.

> FYI, I've been trying to reproduce that initial bug all week, and
> haven't seen a single reoccurance of it, just other bugs.
> Kind of a pain in the ass for confirming this numa stuff was indeed
> the cause, but that's been true of so many of the more obscure bugs
> trinity has shaken out.

+1, it seems to have "disappeared", quite annoying :/


Thanks,
Sasha
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