linux-kernel - Re: [PATCH] mm: fix up a spurious page fault whenever it happens

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Message-ID: <CA+55aFwzedGVew7CCSqZ-Z=2ELt+A4L--mEQGjtALbMSB3LFoQ@mail.gmail.com>
Date:	Thu, 23 May 2013 07:45:09 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Stanislav Meduna <stano@...una.org>
Cc:	Rik van Riel <riel@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Hai Huang <hhuang@...hat.com>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens

On Thu, May 23, 2013 at 1:07 AM, Stanislav Meduna <stano@...una.org> wrote:
>
> It did not crash overnight, but it also does not show any
> minor fault counted for the threads

Page faults that don't cause us to map a page (ie a spurious one, or
one that just updates dirty/accessed bits) don't show up as even minor
faults. Thing of the major/minor as "mapping activity" not a page
fault count.

So if this is due to some stuck TLB entry, that wouldn't show up anyway.

                    Linus
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