From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8FDDC433FF for ; Wed, 31 Jul 2019 13:23:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B0FD120659 for ; Wed, 31 Jul 2019 13:23:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729501AbfGaNXy (ORCPT ); Wed, 31 Jul 2019 09:23:54 -0400 Received: from mx2.suse.de ([195.135.220.15]:33012 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726259AbfGaNXx (ORCPT ); Wed, 31 Jul 2019 09:23:53 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 1D46EAE21; Wed, 31 Jul 2019 13:23:52 +0000 (UTC) Subject: Re: [RFC PATCH 3/3] hugetlbfs: don't retry when pool page allocations start to fail To: Mike Kravetz , Mel Gorman Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hillf Danton , Michal Hocko , Johannes Weiner , Andrew Morton References: <20190724175014.9935-1-mike.kravetz@oracle.com> <20190724175014.9935-4-mike.kravetz@oracle.com> <20190725081350.GD2708@suse.de> <6a7f3705-9550-e22f-efa1-5e3616351df6@oracle.com> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; prefer-encrypt=mutual; keydata= mQINBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 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xVKRSg3I2m+DUTVqBy7Lixo73hnW69kSjtqCeamY/NSu6LNP+b0wAOKhwz9hBEwEHLp05+mj 5ZFJyfGsOiNUcMoO/17FO4EBxSDP3FDLllpuzlFD7SXkfJaMWYmXIlO0jLzdfwfcnDzBbPwO hBM8hvtsyq8lq8vJOxv6XD6xcTtj5Az8t2JjdUX6SF9hxJpwhBU0wrCoGDkWp4Bbv6jnF7zP Nzftr4l8RuJoywDIiJpdaNpSlXKpj/K6KrnyAI/joYc7 Message-ID: Date: Wed, 31 Jul 2019 15:23:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <6a7f3705-9550-e22f-efa1-5e3616351df6@oracle.com> Content-Type: text/plain; charset=iso-8859-15 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/25/19 7:15 PM, Mike Kravetz wrote: > On 7/25/19 1:13 AM, Mel Gorman wrote: >> On Wed, Jul 24, 2019 at 10:50:14AM -0700, Mike Kravetz wrote: >>> When allocating hugetlbfs pool pages via /proc/sys/vm/nr_hugepages, >>> the pages will be interleaved between all nodes of the system. If >>> nodes are not equal, it is quite possible for one node to fill up >>> before the others. When this happens, the code still attempts to >>> allocate pages from the full node. This results in calls to direct >>> reclaim and compaction which slow things down considerably. >>> >>> When allocating pool pages, note the state of the previous allocation >>> for each node. If previous allocation failed, do not use the >>> aggressive retry algorithm on successive attempts. The allocation >>> will still succeed if there is memory available, but it will not try >>> as hard to free up memory. >>> >>> Signed-off-by: Mike Kravetz >> >> set_max_huge_pages can fail the NODEMASK_ALLOC() alloc which you handle >> *but* in the event of an allocation failure this bug can silently recur. >> An informational message might be justified in that case in case the >> stall should recur with no hint as to why. > > Right. > Perhaps a NODEMASK_ALLOC() failure should just result in a quick exit/error. > If we can't allocate a node mask, it is unlikely we will be able to allocate > a/any huge pages. And, the system must be extremely low on memory and there > are likely other bigger issues. Agreed. But I would perhaps drop __GFP_NORETRY from the mask allocation as that can fail for transient conditions. > There have been discussions elsewhere about discontinuing the use of > NODEMASK_ALLOC() and just putting the mask on the stack. That may be > acceptable here as well. > >> Technically passing NULL into >> NODEMASK_FREE is also safe as kfree (if used for that kernel config) can >> handle freeing of a NULL pointer. However, that is cosmetic more than >> anything. Whether you decide to change either or not; > > Yes. > I will clean up with an updated series after more feedback. > >> >> Acked-by: Mel Gorman >> > > Thanks! >