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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 BF3FCC2BBCA for ; Tue, 15 Dec 2020 13:36:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B4F55224D2 for ; Tue, 15 Dec 2020 13:36:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B4F55224D2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id EE1446B005D; Tue, 15 Dec 2020 08:36:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E90AA6B006C; Tue, 15 Dec 2020 08:36:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DA7446B006E; Tue, 15 Dec 2020 08:36:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0020.hostedemail.com [216.40.44.20]) by kanga.kvack.org (Postfix) with ESMTP id C2E926B005D for ; Tue, 15 Dec 2020 08:36:47 -0500 (EST) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 764CD180AD837 for ; Tue, 15 Dec 2020 13:36:47 +0000 (UTC) X-FDA: 77595616854.22.place19_1513aaa27423 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin22.hostedemail.com (Postfix) with ESMTP id 5430D18038E68 for ; Tue, 15 Dec 2020 13:36:47 +0000 (UTC) X-HE-Tag: place19_1513aaa27423 X-Filterd-Recvd-Size: 2394 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Tue, 15 Dec 2020 13:36:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ADzVxBn4h6ZTHahyZDLlSPMxOuRgVYdMo29XXkCfM5o=; b=aaBuP28dRi6gMBiw28L9+7Hj5K YktYhs28TQ5rrpzWgOvBL5EzWuhulhy3EcvFVB3uIMUlPdVjigY8/xJ9PGgikb27nR15MJT/LydSS uimoPxOvXLBu/1jeFRSLcktHxEUYz0C01EWNdNnC3JZBtbJ8aYUKCRxt4Aieqxcv8S19AAhTojrPM N4pFZvgzmp3TxCokWmxjzPoZ2V2tzmxM0cVj/E1skk9N/K7yPXMoBdAsqPp6XD2QoBkjiRBbbJh3a fgkEohop/GnCaGc/vdEPf7LIoMwcQCML9eX8xHCOPdn1cKlLiM6leV1EQO4TC9YJhFx9wUOCdOnF+ SdxwB8CA==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kpAVN-00082I-P3; Tue, 15 Dec 2020 13:36:41 +0000 Date: Tue, 15 Dec 2020 13:36:41 +0000 From: Matthew Wilcox To: Nicholas Piggin Cc: linux-mm@kvack.org, Suresh Siddha , "David S. Miller" , Hugh Dickins , Peter Zijlstra , Suresh Siddha , Andrew Morton , Linus Torvalds Subject: Re: [RFC PATCH] mm: generalise COW SMC TLB flushing race comment Message-ID: <20201215133641.GR2443@casper.infradead.org> References: <20201215121119.351650-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201215121119.351650-1-npiggin@gmail.com> 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 Tue, Dec 15, 2020 at 10:11:19PM +1000, Nicholas Piggin wrote: > I'm not sure if I'm completely missing something here, but AFAIKS the > reference to the mysterious "COW SMC race" confuses the issue. The original > changelog and mailing list thread didn't help me either. Also, I had no idea that SMC meant Self Modifying Code until you prompted me to go and look up the commit. I thought it meant the Japanese corporation. So this commit is a big improvement. It's the only place we use the acronym 'SMC' in mm/ Reviewed-by: Matthew Wilcox (Oracle)