From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f170.google.com (mail-wi0-f170.google.com [209.85.212.170]) by kanga.kvack.org (Postfix) with ESMTP id 54E526B0038 for ; Fri, 24 Jul 2015 16:28:46 -0400 (EDT) Received: by wicmv11 with SMTP id mv11so77647172wic.0 for ; Fri, 24 Jul 2015 13:28:46 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id ic1si6166755wid.77.2015.07.24.13.28.44 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Fri, 24 Jul 2015 13:28:44 -0700 (PDT) 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 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" Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: 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 On Fri, 2015-07-24 at 10:12 -0700, JA?rn 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, 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