Re: [PATCH for 3.2.34] memcg: do not trigger OOM fromadd_to_page_cache_locked

[Michal Hocko]

On Fri 30-11-12 16:03:47, Michal Hocko wrote:
[...]
> Anyway, the more interesting thing is gfp_mask is GFP_NOWAIT allocation
> from the page fault? Huh this shouldn't happen - ever.

OK, it starts making sense now. The message came from
pagefault_out_of_memory which doesn't have gfp nor the required node
information any longer. This suggests that VM_FAULT_OOM has been
returned by the fault handler. So this hasn't been triggered by the page
fault allocator.
I am wondering whether this could be caused by the patch but the effect
of that one should be limitted to the write (unlike the later version
for -mm tree which hooks into the shmem as well).

Will have to think about it some more.
-- 
Michal Hocko
SUSE Labs
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