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=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 BB29DC18E5B for ; Mon, 9 Mar 2020 20:51:19 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 7AD692464B for ; Mon, 9 Mar 2020 20:51:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7AD692464B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=xmission.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 02D2B6B0005; Mon, 9 Mar 2020 16:51:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id F1EB96B0006; Mon, 9 Mar 2020 16:51:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DE5A56B0007; Mon, 9 Mar 2020 16:51:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id C1FCF6B0005 for ; Mon, 9 Mar 2020 16:51:18 -0400 (EDT) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 9D0338248047 for ; Mon, 9 Mar 2020 20:51:18 +0000 (UTC) X-FDA: 76577019036.07.house12_b58859ada31a X-HE-Tag: house12_b58859ada31a X-Filterd-Recvd-Size: 7450 Received: from out01.mta.xmission.com (out01.mta.xmission.com [166.70.13.231]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Mon, 9 Mar 2020 20:51:17 +0000 (UTC) Received: from in02.mta.xmission.com ([166.70.13.52]) by out01.mta.xmission.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jBPMp-00009J-3W; Mon, 09 Mar 2020 14:51:15 -0600 Received: from ip68-227-160-95.om.om.cox.net ([68.227.160.95] helo=x220.xmission.com) by in02.mta.xmission.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.87) (envelope-from ) id 1jBPMn-00036L-Ir; Mon, 09 Mar 2020 14:51:14 -0600 From: ebiederm@xmission.com (Eric W. Biederman) To: Christian Brauner Cc: Bernd Edlinger , Kees Cook , Jann Horn , Jonathan Corbet , Alexander Viro , Andrew Morton , Alexey Dobriyan , Thomas Gleixner , Oleg Nesterov , Frederic Weisbecker , Andrei Vagin , Ingo Molnar , "Peter Zijlstra \(Intel\)" , Yuyang Du , David Hildenbrand , Sebastian Andrzej Siewior , Anshuman Khandual , David Howells , James Morris , Greg Kroah-Hartman , Shakeel Butt , Jason Gunthorpe , Christian Kellner , Andrea Arcangeli , Aleksa Sarai , "Dmitry V. Levin" , "linux-doc\@vger.kernel.org" , "linux-kernel\@vger.kernel.org" , "linux-fsdevel\@vger.kernel.org" , "linux-mm\@kvack.org" , "stable\@vger.kernel.org" , "linux-api\@vger.kernel.org" References: <87a74xi4kz.fsf@x220.int.ebiederm.org> <87r1y8dqqz.fsf@x220.int.ebiederm.org> <87tv32cxmf.fsf_-_@x220.int.ebiederm.org> <87v9ne5y4y.fsf_-_@x220.int.ebiederm.org> <87eeu25y14.fsf_-_@x220.int.ebiederm.org> <20200309195909.h2lv5uawce5wgryx@wittgenstein> <877dztz415.fsf@x220.int.ebiederm.org> <20200309201729.yk5sd26v4bz4gtou@wittgenstein> Date: Mon, 09 Mar 2020 15:48:55 -0500 In-Reply-To: <20200309201729.yk5sd26v4bz4gtou@wittgenstein> (Christian Brauner's message of "Mon, 9 Mar 2020 21:17:29 +0100") Message-ID: <87k13txnig.fsf@x220.int.ebiederm.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-XM-SPF: eid=1jBPMn-00036L-Ir;;;mid=<87k13txnig.fsf@x220.int.ebiederm.org>;;;hst=in02.mta.xmission.com;;;ip=68.227.160.95;;;frm=ebiederm@xmission.com;;;spf=neutral X-XM-AID: U2FsdGVkX1++cg/1/LEU7AeNulDU9zu2Fhhs7DPCMnA= X-SA-Exim-Connect-IP: 68.227.160.95 X-SA-Exim-Mail-From: ebiederm@xmission.com Subject: Re: [PATCH v2 3/5] exec: Move cleanup of posix timers on exec out of de_thread X-SA-Exim-Version: 4.2.1 (built Thu, 05 May 2016 13:38:54 -0600) X-SA-Exim-Scanned: Yes (on in02.mta.xmission.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: Christian Brauner writes: > On Mon, Mar 09, 2020 at 03:06:46PM -0500, Eric W. Biederman wrote: >> Christian Brauner writes: >> >> > On Sun, Mar 08, 2020 at 04:36:55PM -0500, Eric W. Biederman wrote: >> >> >> >> These functions have very little to do with de_thread move them out >> >> of de_thread an into flush_old_exec proper so it can be more clearly >> >> seen what flush_old_exec is doing. >> >> >> >> Signed-off-by: "Eric W. Biederman" >> >> --- >> >> fs/exec.c | 10 +++++----- >> >> 1 file changed, 5 insertions(+), 5 deletions(-) >> >> >> >> diff --git a/fs/exec.c b/fs/exec.c >> >> index ff74b9a74d34..215d86f77b63 100644 >> >> --- a/fs/exec.c >> >> +++ b/fs/exec.c >> >> @@ -1189,11 +1189,6 @@ static int de_thread(struct task_struct *tsk) >> > >> > While you're cleaning up de_thread() wouldn't it be good to also take >> > the opportunity and remove the task argument from de_thread(). It's only >> > ever used with current. Could be done in one of your patches or as a >> > separate patch. >> >> How does that affect the code generation? > > The same way renaming "tsk" to "me" does. > >> >> My sense is that computing current once in flush_old_exec is much >> better than computing it in each function flush_old_exec calls. >> I remember that computing current used to be not expensive but >> noticable. >> >> For clarity I can see renaming tsk to me. So that it is clear we are >> talking about the current process, and not some arbitrary process. > > For clarity since de_thread() uses "tsk" giving the impression that any > task can be dethreaded while it's only ever used with current. It's just > a suggestion since you're doing the rename tsk->me anyway it would fit > with the series. You do whatever you want though. > (I just remember that the same request was made once to changes I did: > Don't pass current as arg when it's the only task passed.) That's fair. And I completely agree that we should at least rename tsk to me. Just for clarity. My apologies if I am a little short. My little son has been an extra handful lately. Eric