From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753653AbdF0P0i (ORCPT ); Tue, 27 Jun 2017 11:26:38 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57028 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751626AbdF0P0b (ORCPT ); Tue, 27 Jun 2017 11:26:31 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com E3919C04D28D Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=jeyu@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com E3919C04D28D Date: Tue, 27 Jun 2017 17:26:05 +0200 From: Jessica Yu To: "Luis R. Rodriguez" Cc: Kees Cook , Andrew Morton , Shuah Khan , Rusty Russell , "Eric W. Biederman" , Dmitry Torokhov , Arnaldo Carvalho de Melo , Jonathan Corbet , Josh Triplett , martin.wilck@suse.com, Michal Marek , Petr Mladek , hare , rwright@hpe.com, Jeff Mahoney , David Sterba , Filipe Manana , NeilBrown , Guenter Roeck , rgoldwyn@suse.com, Subash Abhinov Kasiviswanathan , Heinrich Schuchardt , Aaron Tomlin , Miroslav Benes , "Paul E. McKenney" , Dan Williams , Josh Poimboeuf , "David S. Miller" , Ingo Molnar , Alan Cox , "Ted Ts'o" , Greg KH , Linus Torvalds , linux-kselftest@vger.kernel.org, "linux-doc@vger.kernel.org" , LKML Subject: Re: [PATCH v3 0/4] kmod: help make deterministic Message-ID: <20170627152604.krljck3owqq5acel@redbean> References: <20170526001630.19203-1-mcgrof@kernel.org> <20170526211228.27764-1-mcgrof@kernel.org> <20170620205622.GX21846@wotan.suse.de> <20170626213735.fp34vx7mvbtopzz6@redbean> <20170626224442.GH21846@wotan.suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20170626224442.GH21846@wotan.suse.de> X-OS: Linux redbean 4.11.5-200.fc25.x86_64 x86_64 User-Agent: NeoMutt/20170609 (1.8.3) X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Tue, 27 Jun 2017 15:26:30 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org +++ Luis R. Rodriguez [27/06/17 00:44 +0200]: >On Mon, Jun 26, 2017 at 11:37:36PM +0200, Jessica Yu wrote: >> +++ Kees Cook [20/06/17 17:23 -0700]: >> > On Tue, Jun 20, 2017 at 1:56 PM, Luis R. Rodriguez wrote: >> > > On Fri, May 26, 2017 at 02:12:24PM -0700, Luis R. Rodriguez wrote: >> > > > This v3 nukes the proc sysctl interface in favor for just letting userspace >> > > > just check kernel revision. Prior to whenever this is merged userspace should >> > > > try to avoid hammering more than 50 kmod threads as they can fail and it'd >> > > > get -ENOMEM. >> > > > >> > > > We do away with the old heuristics on assuming you could end up with >> > > > less than max_threads/2 < 50 threads as Dmitry notes this would mean having >> > > > a system with 16 MiB of RAM with modules enabled. It simplifies our patch >> > > > "kmod: reduce atomic operations on kmod_concurrent" considerbly. >> > > > >> > > > Since the sysctl interface is gone, this no longer depends on any >> > > > other patches, the series is independent. As usual the series is >> > > > available on my linux-next 20170526-kmod-only branch which is based >> > > > on next-20170526. >> > > > >> > > > [0] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/log/?h=20170526-kmod-only >> > > > >> > > > Luis >> > > > >> > > > Luis R. Rodriguez (4): >> > > > module: use list_for_each_entry_rcu() on find_module_all() >> > > > kmod: reduce atomic operations on kmod_concurrent and simplify >> > > > kmod: add test driver to stress test the module loader >> > > > kmod: throttle kmod thread limit >> > > >> > > About a month now with no further nitpicks. What tree should these changes >> > > go through if there are no issues? Andrew's, Jessica's ? >> > >> > Seems like going through Jessica's would make the most sense? >> >> Would be happy to take patches 01 (which I need to anyway), 02, >> possibly 04 if decoupled from the test driver (03). > >Feel free to decouple it, but note that then the commit log must then be >changed. My own take is this fix is not so critical as it is a corner case, so >I have instead preferred to couple in the test case and respective fix >together. I'll leave it up to you how to proceed. I'll take 01 and 02 for the next merge window, as they are straightforward. 03/04 can stay together, and as I understand it 04 may need to switch back to using the normal wait_* api. >> I can't take patch 03 through my tree just yet, as I haven't had time to give >> it a look yet :-/ > >Understood. I'd appreciate at least a review though. Of course! I should have rephrased and said *by this upcoming merge window. >> [ Side comment, it seems that kmod.c isn't directly maintained by anyone >> right now, perhaps Luis would be interested in picking it up? :-) ] > >Sure thing, I'm not sure if it makes sense to decouple kernel/kmod.c on >MAINTAINERS though, if you do let me know what you'd prefer to call it, >"KMOD MODULE USERMODE HELPER" ? > >If you prefer to keep them together I can certainly volunteer to review all >kmod changes and can send a patch to add kmod and myself under "MODULE >SUPPORT". I'm not the maintainer for kmod.c, if that's what you mean by decoupling. But I don't think it has one, which is why I'm suggesting adding it to MAINTAINERS, since you've been actively working on it :) (looking at git log, it looks like Andrew did most of the sign-off's for kmod.c in the past). I think a separate entry in MAINTAINERS is good, with the name you suggested. Thanks! Jessica