From mboxrd@z Thu Jan 1 00:00:00 1970 From: akpm@linux-foundation.org Subject: [merged] mm-clarify-compaction-kconfig-text.patch removed from -mm tree Date: Mon, 29 Aug 2016 12:51:27 -0700 Message-ID: <57c4923f.hhMvzBkcNFnVblMc%akpm@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from mail.linuxfoundation.org ([140.211.169.12]:34914 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754185AbcH2Tv2 (ORCPT ); Mon, 29 Aug 2016 15:51:28 -0400 Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: mhocko@suse.com, js1304@gmail.com, markus@trippelsdorf.de, mgorman@suse.de, vbabka@suse.cz, mm-commits@vger.kernel.org The patch titled Subject: mm: clarify COMPACTION Kconfig text has been removed from the -mm tree. Its filename was mm-clarify-compaction-kconfig-text.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Michal Hocko Subject: mm: clarify COMPACTION Kconfig text The current wording of the COMPACTION Kconfig help text doesn't emphasise that disabling COMPACTION might cripple the page allocator which relies on the compaction quite heavily for high order requests and an unexpected OOM can happen with the lack of compaction. Make sure we are vocal about that. Link: http://lkml.kernel.org/r/20160823091726.GK23577@dhcp22.suse.cz Signed-off-by: Michal Hocko Cc: Markus Trippelsdorf Cc: Mel Gorman Cc: Joonsoo Kim Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/Kconfig | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff -puN mm/Kconfig~mm-clarify-compaction-kconfig-text mm/Kconfig --- a/mm/Kconfig~mm-clarify-compaction-kconfig-text +++ a/mm/Kconfig @@ -262,7 +262,14 @@ config COMPACTION select MIGRATION depends on MMU help - Allows the compaction of memory for the allocation of huge pages. + Compaction is the only memory management component to form + high order (larger physically contiguous) memory blocks + reliably. The page allocator relies on compaction heavily and + the lack of the feature can lead to unexpected OOM killer + invocations for high order memory requests. You shouldn't + disable this option unless there really is a strong reason for + it and then we would be really interested to hear about that at + linux-mm@kvack.org. # # support for page migration _ Patches currently in -mm which might be from mhocko@suse.com are mm-oom-prevent-pre-mature-oom-killer-invocation-for-high-order-request.patch mm-vmscan-get-rid-of-throttle_vm_writeout.patch oom-keep-mm-of-the-killed-task-available.patch kernel-oom-fix-potential-pgd_lock-deadlock-from-__mmdrop.patch mm-oom-get-rid-of-signal_struct-oom_victims.patch oom-suspend-fix-oom_killer_disable-vs-pm-suspend-properly.patch mm-make-sure-that-kthreads-will-not-refault-oom-reaped-memory.patch oom-oom_reaper-allow-to-reap-mm-shared-by-the-kthreads.patch