Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754393AbbGXU2q (ORCPT ); Fri, 24 Jul 2015 16:28:46 -0400 Received: from mx2.suse.de ([195.135.220.15]:43010 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752539AbbGXU2p (ORCPT ); Fri, 24 Jul 2015 16:28:45 -0400 Message-ID: <1437769711.3298.55.camel@stgolabs.net> Subject: Re: [PATCH] hugetlb: cond_resched for set_max_huge_pages and follow_hugetlb_page From: Davidlohr Bueso To: =?ISO-8859-1?Q?J=F6rn?= Engel Cc: Michal Hocko , Spencer Baugh , Andrew Morton , Naoya Horiguchi , David Rientjes , Mike Kravetz , Luiz Capitulino , "open list:MEMORY MANAGEMENT" , open list , Spencer Baugh , Joern Engel Date: Fri, 24 Jul 2015 13:28:31 -0700 In-Reply-To: <20150724171237.GC3458@Sligo.logfs.org> References: <1437688476-3399-1-git-send-email-sbaugh@catern.com> <20150724065959.GB4622@dhcp22.suse.cz> <20150724171237.GC3458@Sligo.logfs.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1260 Lines: 29 On Fri, 2015-07-24 at 10:12 -0700, Jörn Engel wrote: > On Fri, Jul 24, 2015 at 08:59:59AM +0200, Michal Hocko wrote: > > On Thu 23-07-15 14:54:31, Spencer Baugh wrote: > > > From: Joern Engel > > > > > > ~150ms scheduler latency for both observed in the wild. > > > > This is way to vague. Could you describe your problem somehow more, > > please? > > There are schduling points in the page allocator (when it triggers the > > reclaim), why are those not sufficient? Or do you manage to allocate > > many hugetlb pages without performing the reclaim and that leads to > > soft lockups? > > We don't use transparent hugepages - they cause too much latency. > Instead we reserve somewhere around 3/4 or so of physical memory for > hugepages. "sysctl -w vm.nr_hugepages=100000" or something similar in a > startup script. > > Since it is early in boot we don't go through page reclaim. Still, please be more verbose about what you _are_ encountering. Iow, please have decent changelog in v2. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/