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From: Jessica Yu <jeyu@redhat.com>
To: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Shuah Khan <shuah@kernel.org>,
	Rusty Russell <rusty@rustcorp.com.au>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Josh Triplett <josh@joshtriplett.org>,
	martin.wilck@suse.com, Michal Marek <mmarek@suse.com>,
	Petr Mladek <pmladek@suse.com>, hare <hare@suse.com>,
	rwright@hpe.com, Jeff Mahoney <jeffm@suse.com>,
	David Sterba <DSterba@suse.com>,
	Filipe Manana <fdmanana@suse.com>, NeilBrown <neilb@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	rgoldwyn@suse.com,
	Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>,
	Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Aaron Tomlin <atomlin@redhat.com>,
	Miroslav Benes <mbenes@suse.cz>,
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	Dan Williams <dan.j.williams@intel.com>,
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Subject: Re: [PATCH v3 0/4] kmod: help make deterministic
Date: Tue, 27 Jun 2017 17:26:05 +0200
Message-ID: <20170627152604.krljck3owqq5acel@redbean> (raw)
In-Reply-To: <20170626224442.GH21846@wotan.suse.de>

+++ 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 <mcgrof@kernel.org> 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

  parent reply index

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-05-19  3:24 [PATCH 0/6] kmod: few simple enhancements Luis R. Rodriguez
2017-05-19  3:24 ` [PATCH 1/6] kmod: add dynamic max concurrent thread count Luis R. Rodriguez
2017-05-19 20:44   ` Dmitry Torokhov
     [not found]     ` <CAB=NE6XGL24O+JfTNUG0HO4obhDc-v+HyL0SCrQELiZrj2-qNw@mail.gmail.com>
     [not found]       ` <CAB=NE6Wa4Nemh80yaCCwbjrNRLPD+GJMncg12APg9Vq63AWVng@mail.gmail.com>
     [not found]         ` <CAB=NE6Vc6RDAytn2Pkv2V58HFo8ncR0eOHZ3===kbZ2NF78ubg@mail.gmail.com>
     [not found]           ` <CAB=NE6Vqmx=y6muenpuQKynTP=pGWMF8tzoCA0BXD6d63q9wPg@mail.gmail.com>
2017-05-19 21:58             ` Dmitry Torokhov
2017-05-25 16:22               ` Luis R. Rodriguez
2017-05-25 16:38                 ` Dmitry Torokhov
2017-05-25 16:50                   ` Luis R. Rodriguez
2017-05-25 17:30                     ` Dmitry Torokhov
2017-05-25 17:38                       ` Luis R. Rodriguez
2017-05-25 18:06                         ` Luis R. Rodriguez
2017-05-25 18:26                           ` Dmitry Torokhov
2017-05-25 19:01                             ` Luis R. Rodriguez
2017-05-25 21:38                               ` Luis R. Rodriguez
2017-05-19  3:24 ` [PATCH 2/6] module: use list_for_each_entry_rcu() on find_module_all() Luis R. Rodriguez
2017-05-23 14:46   ` Miroslav Benes
2017-05-19  3:24 ` [PATCH 3/6] kmod: provide wrappers for kmod_concurrent inc/dec Luis R. Rodriguez
2017-05-19  3:24 ` [PATCH 4/6] kmod: return -EBUSY if modprobe limit is reached Luis R. Rodriguez
2017-05-19  3:24 ` [PATCH 5/6] kmod: preempt on kmod_umh_threads_get() Luis R. Rodriguez
2017-05-19 22:27   ` Dmitry Torokhov
2017-05-25  0:14     ` Luis R. Rodriguez
2017-05-25  0:45       ` Dmitry Torokhov
2017-05-25  1:00         ` Luis R. Rodriguez
2017-05-25  2:27           ` Dmitry Torokhov
2017-05-25 11:19             ` Petr Mladek
2017-05-25 15:38               ` Luis R. Rodriguez
2017-05-25 16:42               ` Dmitry Torokhov
2017-05-25 15:18             ` Jessica Yu
2017-05-19  3:24 ` [PATCH 6/6] kmod: use simplified rate limit printk Luis R. Rodriguez
2017-05-19 22:23   ` Dmitry Torokhov
2017-05-23  9:00     ` Petr Mladek
2017-05-26  0:16 ` [PATCH v2 0/5] kmod: help make deterministic Luis R. Rodriguez
2017-05-26  0:16   ` [PATCH v2 1/5] module: use list_for_each_entry_rcu() on find_module_all() Luis R. Rodriguez
2017-05-26  0:16   ` [PATCH v2 2/5] kmod: reduce atomic operations on kmod_concurrent Luis R. Rodriguez
2017-05-26  1:11     ` Dmitry Torokhov
2017-05-26 20:03       ` Luis R. Rodriguez
2017-05-26  0:16   ` [PATCH v2 3/5] kmod: add test driver to stress test the module loader Luis R. Rodriguez
2017-05-26  0:16   ` [PATCH v2 4/5] kmod: add helpers for getting kmod limit Luis R. Rodriguez
2017-05-26  0:56     ` Dmitry Torokhov
2017-05-26 20:27       ` Luis R. Rodriguez
2017-05-26  0:16   ` [PATCH v2 5/5] kmod: throttle kmod thread limit Luis R. Rodriguez
2017-05-26 21:12   ` [PATCH v3 0/4] kmod: help make deterministic Luis R. Rodriguez
2017-05-26 21:12     ` [PATCH v3 1/4] module: use list_for_each_entry_rcu() on find_module_all() Luis R. Rodriguez
2017-05-26 21:12     ` [PATCH v3 2/4] kmod: reduce atomic operations on kmod_concurrent and simplify Luis R. Rodriguez
2017-06-23 19:19       ` [PATCH v4 " Luis R. Rodriguez
2017-06-26 11:36       ` [PATCH v3 " Petr Mladek
2017-05-26 21:12     ` [PATCH v3 3/4] kmod: add test driver to stress test the module loader Luis R. Rodriguez
2017-05-26 21:12     ` [PATCH v3 4/4] kmod: throttle kmod thread limit Luis R. Rodriguez
2017-06-22 15:19       ` Petr Mladek
2017-06-23 16:16         ` Luis R. Rodriguez
2017-06-23 17:56           ` Luis R. Rodriguez
2017-06-23 19:16             ` Luis R. Rodriguez
2017-06-26 10:03               ` Petr Mladek
2017-06-26  9:55           ` Petr Mladek
2017-06-23 19:20       ` [PATCH v4 " Luis R. Rodriguez
2017-06-26 11:38         ` Petr Mladek
2017-06-28 22:11           ` Luis R. Rodriguez
2017-06-20 20:56     ` [PATCH v3 0/4] kmod: help make deterministic Luis R. Rodriguez
2017-06-21  0:23       ` Kees Cook
2017-06-26 21:37         ` Jessica Yu
2017-06-26 22:44           ` Luis R. Rodriguez
2017-06-27  0:27             ` Luis R. Rodriguez
2017-06-27  8:13               ` Petr Mladek
2017-06-27 10:04                 ` Jessica Yu
2017-06-27 15:26             ` Jessica Yu [this message]
2017-06-28  0:49               ` Luis R. Rodriguez
2017-06-28 22:31     ` [PATCH v4 0/3] " Luis R. Rodriguez
2017-06-28 22:31       ` [PATCH v4 1/3] MAINTAINERS: give kmod some maintainer love Luis R. Rodriguez
2017-06-28 22:31       ` [PATCH v4 2/3] kmod: add test driver to stress test the module loader Luis R. Rodriguez
2017-06-28 22:31       ` [PATCH v4 3/3] kmod: throttle kmod thread limit Luis R. Rodriguez

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