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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)
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Message: 1
Date: Mon, 10 Nov 2014 16:23:57 -0800
From: Joel Fernandes <[email protected]>
Subject: Confusion about __do_fault and MM_ANONPAGES
To: Linux Kernel Mailing List <[email protected]>,
"[email protected]" <[email protected]>
Cc: Andrew Morton <[email protected]>
Message-ID:
<CAD=GYpYqbTrJ-wTZy=UBX1Z5=zmgvoayu8jsa81rrcc4g02...@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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