Content of Kernelnewbies...

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Subject: Kernelnewbies Digest, Vol 48, Issue 13

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Today's Topics:

   1. Confusion about __do_fault and MM_ANONPAGES (Joel Fernandes)


----------------------------------------------------------------------

Message: 1
Date: Mon, 10 Nov 2014 16:23:57 -0800
From: Joel Fernandes <agnel.joel@gmail.com>
Subject: Confusion about __do_fault and MM_ANONPAGES
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"kernelnewbies at kernelnewbies.org" <kernelnewbies@kernelnewbies.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Message-ID:
	<CAD=GYpYqbTrJ-wTZy=UBX1Z5=zMGVoaYU8jSa81rrcC4G0271w@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Hi,

I have some confusion about when is anon=1 when __do_fault is called.

__do_fault seems to be called only when the page fault is of a linear
or a non-linear mapping. My understanding is neither of these can be
anonymous, so I am confused about the below code fragment:

In which case is anon=1 when memory.c::__do_fault is called?
In __do_fault, you'll see something like...
        if (anon) {
            inc_mm_counter_fast(mm, MM_ANONPAGES);
            page_add_new_anon_rmap(page, vma, address);
        } else {


Thanks!
Joel



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