Re: [patch v3] mm, hugetlb: abort __get_user_pages if current has been oom killed

From: Davidlohr Bueso
Date: Tue Mar 10 2015 - 15:26:19 EST

On Mon, 2015-03-09 at 13:07 -0700, David Rientjes wrote:
> If __get_user_pages() is faulting a significant number of hugetlb pages,
> usually as the result of mmap(MAP_LOCKED), it can potentially allocate a
> very large amount of memory.
> If the process has been oom killed, this will cause a lot of memory to
> potentially deplete memory reserves.
> In the same way that commit 4779280d1ea4 ("mm: make get_user_pages()
> interruptible") aborted for pending SIGKILLs when faulting non-hugetlb
> memory, based on the premise of commit 462e00cc7151 ("oom: stop
> allocating user memory if TIF_MEMDIE is set"), hugetlb page faults now
> terminate when the process has been oom killed.
> Cc: Greg Thelen <gthelen@xxxxxxxxxx>
> Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
> Acked-by: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
> Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>

Makes sense.

Acked-by: Davidlohr Bueso <dave@xxxxxxxxxxxx>

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