2014-11-11 00:23:59

by Joel A Fernandes

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Subject: Confusion about __do_fault and MM_ANONPAGES

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