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 A0BFCC3A59E for ; Mon, 26 Aug 2019 07:31:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8007220874 for ; Mon, 26 Aug 2019 07:31:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730072AbfHZHbm (ORCPT ); Mon, 26 Aug 2019 03:31:42 -0400 Received: from mga06.intel.com ([134.134.136.31]:50867 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726896AbfHZHbl (ORCPT ); Mon, 26 Aug 2019 03:31:41 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Aug 2019 00:31:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,431,1559545200"; d="scan'208";a="191648428" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga002.jf.intel.com with ESMTP; 26 Aug 2019 00:31:39 -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: [PATCH 0/2] mm/mmap.c: reduce subtree gap propagation a little Date: Mon, 26 Aug 2019 15:31:04 +0800 Message-Id: <20190826073106.29971-1-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 0.4% function all for vma_compute_subtree_gap. 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