From patchwork Mon Mar 1 16:11:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mel Gorman X-Patchwork-Id: 12110179 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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT 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 4928DC4360C for ; Mon, 1 Mar 2021 16:15:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1DA1764D90 for ; Mon, 1 Mar 2021 16:15:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237631AbhCAQPA (ORCPT ); Mon, 1 Mar 2021 11:15:00 -0500 Received: from outbound-smtp50.blacknight.com ([46.22.136.234]:33065 "EHLO outbound-smtp50.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237664AbhCAQND (ORCPT ); Mon, 1 Mar 2021 11:13:03 -0500 Received: from mail.blacknight.com (pemlinmail02.blacknight.ie [81.17.254.11]) by outbound-smtp50.blacknight.com (Postfix) with ESMTPS id 69F1DFA8FF for ; Mon, 1 Mar 2021 16:12:01 +0000 (GMT) Received: (qmail 30423 invoked from network); 1 Mar 2021 16:12:01 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.22.4]) by 81.17.254.9 with ESMTPA; 1 Mar 2021 16:12:01 -0000 From: Mel Gorman To: Andrew Morton Cc: Chuck Lever , Jesper Dangaard Brouer , LKML , Linux-Net , Linux-MM , Linux-NFS , Mel Gorman Subject: [PATCH 0/5] Introduce a bulk order-0 page allocator with two in-tree users Date: Mon, 1 Mar 2021 16:11:55 +0000 Message-Id: <20210301161200.18852-1-mgorman@techsingularity.net> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This series introduces a bulk order-0 page allocator with sunrpc and the network page pool being the first users. The implementation is not particularly efficient and the intention is to iron out what the semantics of the API should have for users. Once the semantics are ironed out, it can be made more efficient. Improving the implementation requires fairly deep surgery in numerous places. The lock scope would need to be significantly reduced, particularly as vmstat, per-cpu and the buddy allocator have different locking protocol that overall -- e.g. all partially depend on irqs being disabled at various points. Secondly, the core of the allocator deals with single pages where as both the bulk allocator and per-cpu allocator operate in batches. All of that has to be reconciled with all the existing users and their constraints (memory offline, CMA and cpusets being the trickiest). Light testing passed, I'm relying on Chuck and Jesper to test the target users more aggressively but both report performance improvements with the initial RFC. Patch 1 of this series is a cleanup to sunrpc, it could be merged separately but is included here as a pre-requisite. Patch 2 is the prototype bulk allocator Patch 3 is the sunrpc user. Chuck also has a patch which further caches pages but is not included in this series. It's not directly related to the bulk allocator and as it caches pages, it might have other concerns (e.g. does it need a shrinker?) Patch 4 is a preparation patch only for the network user Patch 5 converts the net page pool to the bulk allocator for order-0 pages. include/linux/gfp.h | 13 +++++ mm/page_alloc.c | 113 +++++++++++++++++++++++++++++++++++++++++- net/core/page_pool.c | 102 +++++++++++++++++++++++--------------- net/sunrpc/svc_xprt.c | 47 ++++++++++++------ 4 files changed, 220 insertions(+), 55 deletions(-)