From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-vk0-f71.google.com (mail-vk0-f71.google.com [209.85.213.71]) by kanga.kvack.org (Postfix) with ESMTP id C23216B0069 for ; Thu, 20 Oct 2016 15:26:49 -0400 (EDT) Received: by mail-vk0-f71.google.com with SMTP id h85so52938617vkc.6 for ; Thu, 20 Oct 2016 12:26:49 -0700 (PDT) Received: from mail-qk0-f169.google.com (mail-qk0-f169.google.com. [209.85.220.169]) by mx.google.com with ESMTPS id j74si23117957vki.115.2016.10.20.12.26.48 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 20 Oct 2016 12:26:48 -0700 (PDT) Received: by mail-qk0-f169.google.com with SMTP id z190so113481976qkc.2 for ; Thu, 20 Oct 2016 12:26:48 -0700 (PDT) Date: Thu, 20 Oct 2016 21:26:47 +0200 From: Michal Hocko Subject: Re: [PATCH 00/10] mm: adjust get_user_pages* functions to explicitly pass FOLL_* flags Message-ID: <20161020192646.GC27342@dhcp22.suse.cz> References: <20161013002020.3062-1-lstoakes@gmail.com> <20161018153050.GC13117@dhcp22.suse.cz> <20161019085815.GA22239@lucifer> <20161019090727.GE7517@dhcp22.suse.cz> <5807A427.7010200@linux.intel.com> <20161019170127.GN24393@dhcp22.suse.cz> <5807AC2B.4090208@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5807AC2B.4090208@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: Lorenzo Stoakes , linux-mm@kvack.org, Linus Torvalds , Jan Kara , Hugh Dickins , Rik van Riel , Mel Gorman , Andrew Morton , adi-buildroot-devel@lists.sourceforge.net, ceph-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, kvm@vger.kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cris-kernel@axis.com, linux-fbdev@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-mips@linux-mips.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-scsi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-sh@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org On Wed 19-10-16 10:23:55, Dave Hansen wrote: > On 10/19/2016 10:01 AM, Michal Hocko wrote: > > The question I had earlier was whether this has to be an explicit FOLL > > flag used by g-u-p users or we can just use it internally when mm != > > current->mm > > The reason I chose not to do that was that deferred work gets run under > a basically random 'current'. If we just use 'mm != current->mm', then > the deferred work will sometimes have pkeys enforced and sometimes not, > basically randomly. OK, I see (async_pf_execute and ksm ). It makes more sense to me. Thanks for the clarification. -- Michal Hocko SUSE Labs -- 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