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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=no 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 4F6DFCA9EA1 for ; Fri, 18 Oct 2019 10:56:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 04ACA2082C for ; Fri, 18 Oct 2019 10:56:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 04ACA2082C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=techsingularity.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 820108E0006; Fri, 18 Oct 2019 06:56:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7CE0E8E0005; Fri, 18 Oct 2019 06:56:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5FB658E0006; Fri, 18 Oct 2019 06:56:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0237.hostedemail.com [216.40.44.237]) by kanga.kvack.org (Postfix) with ESMTP id 396F98E0003 for ; Fri, 18 Oct 2019 06:56:10 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with SMTP id CEFE562D0 for ; Fri, 18 Oct 2019 10:56:09 +0000 (UTC) X-FDA: 76056600858.25.town31_189ba4dab2303 X-HE-Tag: town31_189ba4dab2303 X-Filterd-Recvd-Size: 2071 Received: from outbound-smtp06.blacknight.com (outbound-smtp06.blacknight.com [81.17.249.39]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Fri, 18 Oct 2019 10:56:08 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp06.blacknight.com (Postfix) with ESMTPS id 5E6039886A for ; Fri, 18 Oct 2019 11:56:07 +0100 (IST) Received: (qmail 30710 invoked from network); 18 Oct 2019 10:56:07 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.19.210]) by 81.17.254.9 with ESMTPA; 18 Oct 2019 10:56:07 -0000 From: Mel Gorman To: Andrew Morton Cc: Michal Hocko , Vlastimil Babka , Thomas Gleixner , Matt Fleming , Borislav Petkov , Linux-MM , Linux Kernel Mailing List , Mel Gorman Subject: [PATCH 0/3] Recalculate per-cpu page allocator batch and high limits after deferred meminit Date: Fri, 18 Oct 2019 11:56:03 +0100 Message-Id: <20191018105606.3249-1-mgorman@techsingularity.net> X-Mailer: git-send-email 2.16.4 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: A private report stated that system CPU usage was excessive on an AMD EPYC 2 machine while building kernels with much longer build times than expected. The issue is partially explained by high zone lock contention due to the per-cpu page allocator batch and high limits being calculated incorrectly. This series addresses a large chunk of the problem. Patch 1 is mostly cosmetic but prepares for patch 2 which is the real fix. Patch 3 is definiely cosmetic but was noticed while implementing the fix. Proper details are in the changelog for patch 2. include/linux/mm.h | 3 --- mm/internal.h | 3 +++ mm/page_alloc.c | 33 ++++++++++++++++++++------------- 3 files changed, 23 insertions(+), 16 deletions(-) -- 2.16.4