From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752561AbcEPILa (ORCPT ); Mon, 16 May 2016 04:11:30 -0400 Received: from mail-wm0-f43.google.com ([74.125.82.43]:35327 "EHLO mail-wm0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751895AbcEPIL2 (ORCPT ); Mon, 16 May 2016 04:11:28 -0400 Date: Mon, 16 May 2016 10:11:26 +0200 From: Michal Hocko To: Vlastimil Babka Cc: linux-mm@kvack.org, Andrew Morton , Joonsoo Kim , Rik van Riel , David Rientjes , Mel Gorman , Johannes Weiner , Tetsuo Handa , linux-kernel@vger.kernel.org, Linus Torvalds Subject: Re: [RFC 11/13] mm, compaction: add the ultimate direct compaction priority Message-ID: <20160516081125.GC23146@dhcp22.suse.cz> References: <1462865763-22084-1-git-send-email-vbabka@suse.cz> <1462865763-22084-12-git-send-email-vbabka@suse.cz> <20160513133851.GP20141@dhcp22.suse.cz> <573973F7.7070202@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <573973F7.7070202@suse.cz> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 16-05-16 09:17:11, Vlastimil Babka wrote: > On 05/13/2016 03:38 PM, Michal Hocko wrote: > > On Tue 10-05-16 09:36:01, Vlastimil Babka wrote: [...] > > > such as hugetlbfs allocations, and reduce some corner-case OOM's for non-costly > > > allocations. > > > > My testing has shown that even with the current implementation with > > deferring, skip hints and cached positions had (close to) 100% success > > rate even with close to OOM conditions. > > Hmm, I thought you at one point said that ignoring skip hints was a large > improvement, because the current resetting of them is just too fuzzy. Not in the hugetlb test. But you are right that skip hints resulted in really fuzzy behavior. -- Michal Hocko SUSE Labs