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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	Davidlohr Bueso <dave@stgolabs.net>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch v2] mm, hugetlb: abort __get_user_pages if current has been oom killed
Date: Mon, 9 Mar 2015 13:24:29 +0200	[thread overview]
Message-ID: <20150309112429.GA14936@node.dhcp.inet.fi> (raw)
In-Reply-To: <alpine.DEB.2.10.1503090041120.21058@chino.kir.corp.google.com>

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@ah.jp.nec.com>
> Cc: Davidlohr Bueso <dave@stgolabs.net>
> Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
> Signed-off-by: David Rientjes <rientjes@google.com>

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

-- 
 Kirill A. Shutemov

  reply	other threads:[~2015-03-09 11:24 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-08 23:12 [patch] " David Rientjes
2015-03-09  4:30 ` Kirill A. Shutemov
2015-03-09  7:42   ` [patch v2] " David Rientjes
2015-03-09 11:24     ` Kirill A. Shutemov [this message]
2015-03-09 12:04     ` Greg Thelen
2015-03-09 20:07       ` [patch v3] " David Rientjes
2015-03-09 20:53         ` Rik van Riel
2015-03-10  0:47         ` Greg Thelen
2015-03-10 19:26         ` Davidlohr Bueso

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