linux-kernel - Re: [PATCH v3 0/4] kmod: help make deterministic

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Date:   Mon, 26 Jun 2017 23:37:36 +0200
From:   Jessica Yu <jeyu@...hat.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Rusty Russell <rusty@...tcorp.com.au>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Josh Triplett <josh@...htriplett.org>, martin.wilck@...e.com,
        Michal Marek <mmarek@...e.com>, Petr Mladek <pmladek@...e.com>,
        hare <hare@...e.com>, rwright@....com,
        Jeff Mahoney <jeffm@...e.com>, David Sterba <DSterba@...e.com>,
        Filipe Manana <fdmanana@...e.com>, NeilBrown <neilb@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, rgoldwyn@...e.com,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Aaron Tomlin <atomlin@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...hat.com>,
        Alan Cox <alan@...ux.intel.com>, Ted Ts'o <tytso@....edu>,
        Greg KH <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kselftest@...r.kernel.org,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 0/4] kmod: help make deterministic

+++ Kees Cook [20/06/17 17:23 -0700]:
>On Tue, Jun 20, 2017 at 1:56 PM, Luis R. Rodriguez <mcgrof@...nel.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). I can't take patch
03 through my tree just yet, as I haven't had time to give it a look
yet :-/

[ Side comment, it seems that kmod.c isn't directly maintained by anyone
right now, perhaps Luis would be interested in picking it up? :-) ]

Thanks,

Jessica