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Date: Thu, 23 May 2013 07:50:09 -0700
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Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens
From: Linus Torvalds <torvalds@linux-foundation.org>
To: Stanislav Meduna <stano@meduna.org>
Cc: Rik van Riel <riel@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        "linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Hai Huang <hhuang@redhat.com>
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On Thu, May 23, 2013 at 7:45 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> 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.

Actually, I take that back. We always update eithe rmin_flt or maj_flt. My bad.

Another question: I'm assuming this is all 32-bit, is it with PAE
enabled? That changes some of the TLB flushing, and we had one bug
related to that, maybe there are others..

            Linus