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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT 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 5F729C43A1D for ; Thu, 12 Jul 2018 08:04:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1DC4F20C0C for ; Thu, 12 Jul 2018 08:04:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1DC4F20C0C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732462AbeGLIMq (ORCPT ); Thu, 12 Jul 2018 04:12:46 -0400 Received: from mx2.suse.de ([195.135.220.15]:58944 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726486AbeGLIMq (ORCPT ); Thu, 12 Jul 2018 04:12:46 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id DB46AAE6E; Thu, 12 Jul 2018 08:04:19 +0000 (UTC) Date: Thu, 12 Jul 2018 10:04:18 +0200 From: Michal Hocko To: Yang Shi Cc: "Kirill A. Shutemov" , willy@infradead.org, ldufour@linux.vnet.ibm.com, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC v4 0/3] mm: zap pages with read mmap_sem in munmap for large mapping Message-ID: <20180712080418.GC32648@dhcp22.suse.cz> References: <1531265649-93433-1-git-send-email-yang.shi@linux.alibaba.com> <20180711111052.hbyukcwetmjjpij2@kshutemo-mobl1> <3d4c69c9-dd2b-30d2-5bf2-d5b108a76758@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3d4c69c9-dd2b-30d2-5bf2-d5b108a76758@linux.alibaba.com> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 11-07-18 10:04:48, Yang Shi wrote: [...] > One approach is to save all the vmas on a separate list, then zap_page_range > does unmap with this list. Just detached unmapped vma chain from mm. You can keep the existing vm_next chain and reuse it. -- Michal Hocko SUSE Labs