From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f47.google.com (mail-wg0-f47.google.com [74.125.82.47]) by kanga.kvack.org (Postfix) with ESMTP id 6C08C6B0032 for ; Mon, 9 Mar 2015 07:24:39 -0400 (EDT) Received: by wggz12 with SMTP id z12so7936872wgg.0 for ; Mon, 09 Mar 2015 04:24:38 -0700 (PDT) Received: from jenni2.inet.fi (mta-out1.inet.fi. [62.71.2.227]) by mx.google.com with ESMTP id n10si34862674wjb.126.2015.03.09.04.24.37 for ; Mon, 09 Mar 2015 04:24:37 -0700 (PDT) Date: Mon, 9 Mar 2015 13:24:29 +0200 From: "Kirill A. Shutemov" Subject: Re: [patch v2] mm, hugetlb: abort __get_user_pages if current has been oom killed Message-ID: <20150309112429.GA14936@node.dhcp.inet.fi> References: <20150309043051.GA13380@node.dhcp.inet.fi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: Andrew Morton , Naoya Horiguchi , Davidlohr Bueso , linux-kernel@vger.kernel.org, linux-mm@kvack.org 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 > Cc: Davidlohr Bueso > Cc: "Kirill A. Shutemov" > Signed-off-by: David Rientjes Acked-by: Kirill A. Shutemo -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org