From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f178.google.com (mail-ig0-f178.google.com [209.85.213.178]) by kanga.kvack.org (Postfix) with ESMTP id DBB79900018 for ; Mon, 9 Mar 2015 20:47:13 -0400 (EDT) Received: by igbhl2 with SMTP id hl2so24382009igb.0 for ; Mon, 09 Mar 2015 17:47:13 -0700 (PDT) Received: from mail-ig0-x231.google.com (mail-ig0-x231.google.com. [2607:f8b0:4001:c05::231]) by mx.google.com with ESMTPS id b12si924780igv.25.2015.03.09.17.47.13 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Mar 2015 17:47:13 -0700 (PDT) Received: by igkb16 with SMTP id b16so26486974igk.1 for ; Mon, 09 Mar 2015 17:47:13 -0700 (PDT) References: <20150309043051.GA13380@node.dhcp.inet.fi> From: Greg Thelen Subject: Re: [patch v3] mm, hugetlb: abort __get_user_pages if current has been oom killed In-reply-to: Date: Mon, 09 Mar 2015 17:47:08 -0700 Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: Andrew Morton , Naoya Horiguchi , Davidlohr Bueso , "Kirill A. Shutemov" , linux-kernel@vger.kernel.org, linux-mm@kvack.org On Mon, Mar 09 2015, 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 > Cc: Naoya Horiguchi > Cc: Davidlohr Bueso > Acked-by: "Kirill A. Shutemov" > Signed-off-by: David Rientjes Looks good. Acked-by: "Greg Thelen" -- 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