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: 12110167 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=ham 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 0E328C433DB for ; Mon, 1 Mar 2021 16:12:09 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5B46A64DE5 for ; Mon, 1 Mar 2021 16:12:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5B46A64DE5 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 C9D118D0080; Mon, 1 Mar 2021 11:12:07 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C4C8D8D0063; Mon, 1 Mar 2021 11:12:07 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B61ED8D0080; Mon, 1 Mar 2021 11:12:07 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0092.hostedemail.com [216.40.44.92]) by kanga.kvack.org (Postfix) with ESMTP id A07518D0063 for ; Mon, 1 Mar 2021 11:12:07 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 072106100 for ; Mon, 1 Mar 2021 16:12:07 +0000 (UTC) X-FDA: 77871797094.12.E6EDA6C Received: from outbound-smtp47.blacknight.com (outbound-smtp47.blacknight.com [46.22.136.64]) by imf19.hostedemail.com (Postfix) with ESMTP id 2D3AE90009F5 for ; Mon, 1 Mar 2021 16:11:58 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail02.blacknight.ie [81.17.254.11]) by outbound-smtp47.blacknight.com (Postfix) with ESMTPS id 6A45FFA919 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 X-Stat-Signature: qoz8ekweqrks37ircfeddtwb51cxqnc1 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2D3AE90009F5 Received-SPF: none (techsingularity.net>: No applicable sender policy available) receiver=imf19; identity=mailfrom; envelope-from=""; helo=outbound-smtp47.blacknight.com; client-ip=46.22.136.64 X-HE-DKIM-Result: none/none X-HE-Tag: 1614615118-441408 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: 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(-)