linux-kernel - Re: [patch v2] mm, hugetlb: abort __get_user

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Message-ID: <20150309112429.GA14936@node.dhcp.inet.fi>
Date:	Mon, 9 Mar 2015 13:24:29 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch v2] mm, hugetlb: abort __get_user_pages if current has
 been oom killed

On Mon, Mar 09, 2015 at 12:42:15AM -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
> be overcharged to its memcg since it has access to memory reserves or
> could potentially deplete all system 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: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Cc: "Kirill A. Shutemov" <kirill@...temov.name>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Acked-by: Kirill A. Shutemo <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov
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