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=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 11962C433E1 for ; Mon, 18 May 2020 09:28:15 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DC9FF207F5 for ; Mon, 18 May 2020 09:28:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DC9FF207F5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 79F0F900003; Mon, 18 May 2020 05:28:14 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 72A4C900002; Mon, 18 May 2020 05:28:14 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 617C5900003; Mon, 18 May 2020 05:28:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0039.hostedemail.com [216.40.44.39]) by kanga.kvack.org (Postfix) with ESMTP id 43FE7900002 for ; Mon, 18 May 2020 05:28:14 -0400 (EDT) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 01B41D229 for ; Mon, 18 May 2020 09:28:13 +0000 (UTC) X-FDA: 76829313708.11.maid07_d9fb5080ea24 X-HE-Tag: maid07_d9fb5080ea24 X-Filterd-Recvd-Size: 2270 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf37.hostedemail.com (Postfix) with ESMTP for ; Mon, 18 May 2020 09:28:13 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id C7D08AFB1; Mon, 18 May 2020 09:28:13 +0000 (UTC) Subject: Re: [PATCH v5 01/10] mmap locking API: initial implementation as rwsem wrappers To: Michel Lespinasse , Andrew Morton , linux-mm Cc: LKML , Peter Zijlstra , Laurent Dufour , Matthew Wilcox , Liam Howlett , Jerome Glisse , Davidlohr Bueso , David Rientjes , Hugh Dickins , Ying Han , Jason Gunthorpe , Daniel Jordan , Davidlohr Bueso References: <20200422001422.232330-1-walken@google.com> <20200422001422.232330-2-walken@google.com> From: Vlastimil Babka Message-ID: Date: Mon, 18 May 2020 11:28:08 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200422001422.232330-2-walken@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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: On 4/22/20 2:14 AM, Michel Lespinasse wrote: > This change wraps the existing mmap_sem related rwsem calls into a new > mmap locking API. There are two justifications for the new API: > > - At first, it provides an easy hooking point to instrument mmap_sem > locking latencies independently of any other rwsems. > > - In the future, it may be a starting point for replacing the rwsem > implementation with a different one, such as range locks. > > Signed-off-by: Michel Lespinasse > Reviewed-by: Daniel Jordan > Reviewed-by: Davidlohr Bueso Reviewed-by: Vlastimil Babka