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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 93E79C433F5 for ; Tue, 15 Feb 2022 14:52:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239514AbiBOOwu (ORCPT ); Tue, 15 Feb 2022 09:52:50 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:34020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238708AbiBOOv6 (ORCPT ); Tue, 15 Feb 2022 09:51:58 -0500 Received: from outbound-smtp21.blacknight.com (outbound-smtp21.blacknight.com [81.17.249.41]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 26E91120 for ; Tue, 15 Feb 2022 06:51:23 -0800 (PST) Received: from mail.blacknight.com (pemlinmail04.blacknight.ie [81.17.254.17]) by outbound-smtp21.blacknight.com (Postfix) with ESMTPS id AADE0CCB67 for ; Tue, 15 Feb 2022 14:51:22 +0000 (GMT) Received: (qmail 13583 invoked from network); 15 Feb 2022 14:51:22 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.17.223]) by 81.17.254.9 with ESMTPA; 15 Feb 2022 14:51:22 -0000 From: Mel Gorman To: Andrew Morton Cc: Aaron Lu , Dave Hansen , Vlastimil Babka , Michal Hocko , Jesper Dangaard Brouer , LKML , Linux-MM , Mel Gorman Subject: [PATCH 0/5] Follow-up on high-order PCP caching Date: Tue, 15 Feb 2022 14:51:06 +0000 Message-Id: <20220215145111.27082-1-mgorman@techsingularity.net> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit 44042b449872 ("mm/page_alloc: allow high-order pages to be stored on the per-cpu lists") was primarily aimed at reducing the cost of SLUB cache refills of high-order pages in two ways. Firstly, zone lock acquisitions was reduced and secondly, there were fewer buddy list modifications. This is a follow-up series fixing some issues that became apparant after merging. Patch 1 is a functional fix. It's harmless but inefficient. Patches 2-4 reduce the overhead of bulk freeing of PCP pages. While the overhead is small, it's cumulative and noticable when truncating large files. The changelog for patch 4 includes results of a microbench that deletes large sparse files with data in page cache. Sparse files were used to eliminate filesystem overhead. Patch 5 addresses issues with high-order PCP pages being stored on PCP lists for too long. Pages freed on a CPU potentially may not be quickly reused and in some cases this can increase cache miss rates. Details are included in the changelog. mm/page_alloc.c | 128 ++++++++++++++++++++++++------------------------ 1 file changed, 64 insertions(+), 64 deletions(-) -- 2.31.1