* Content of Kernelnewbies...
[not found] <mailman.1.1415725202.24821.kernelnewbies@kernelnewbies.org>
@ 2014-11-12 5:29 ` pushpendra.singh at smartplayin.com
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From: pushpendra.singh at smartplayin.com @ 2014-11-12 5:29 UTC (permalink / raw)
To: kernelnewbies
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Sent: Tuesday, 11 November, 2014 10:30pm
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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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