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=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 F30C3C3A5A1 for ; Wed, 28 Aug 2019 06:06:42 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9F6542189D for ; Wed, 28 Aug 2019 06:06:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9F6542189D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 242C46B0008; Wed, 28 Aug 2019 02:06:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1F3856B000C; Wed, 28 Aug 2019 02:06:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0BB9B6B000D; Wed, 28 Aug 2019 02:06:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0027.hostedemail.com [216.40.44.27]) by kanga.kvack.org (Postfix) with ESMTP id E0B676B0008 for ; Wed, 28 Aug 2019 02:06:41 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 7DAB4180AD805 for ; Wed, 28 Aug 2019 06:06:41 +0000 (UTC) X-FDA: 75870802602.13.gun11_3a55e5ded8930 X-HE-Tag: gun11_3a55e5ded8930 X-Filterd-Recvd-Size: 2030 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by imf48.hostedemail.com (Postfix) with ESMTP for ; Wed, 28 Aug 2019 06:06:40 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 27 Aug 2019 23:06:39 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,440,1559545200"; d="scan'208";a="210034522" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by fmsmga002.fm.intel.com with ESMTP; 27 Aug 2019 23:06:37 -0700 From: Wei Yang To: akpm@linux-foundation.org, vbabka@suse.cz, kirill.shutemov@linux.intel.com, yang.shi@linux.alibaba.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [RESEND [PATCH] 0/2] mm/mmap.c: reduce subtree gap propagation a little Date: Wed, 28 Aug 2019 14:06:12 +0800 Message-Id: <20190828060614.19535-1-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 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: When insert and delete a vma, it will compute and propagate related subtree gap. After some investigation, we can reduce subtree gap propagation a little. [1]: This one reduce the propagation by update *next* gap after itself, since *next* must be a parent in this case. [2]: This one achieve this by unlinking vma from list. After applying these two patches, test shows it reduce 0.3% function call for vma_compute_subtree_gap. BTW, this series is based on some un-merged cleanup patched. --- This version is rebased on current linus tree, whose last commit is commit 9e8312f5e160 ("Merge tag 'nfs-for-5.3-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs"). Wei Yang (2): mm/mmap.c: update *next* gap after itself mm/mmap.c: unlink vma before rb_erase mm/mmap.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) -- 2.17.1