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Subject: Re: [RFC PATCH v0.1 0/9] UMCG early preview/RFC patchset
To:     Peter Oskolkov <posk@google.com>, Jonathan Corbet <corbet@lwn.net>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-api <linux-api@vger.kernel.org>,
        Paul Turner <pjt@google.com>, Ben Segall <bsegall@google.com>,
        Peter Oskolkov <posk@posk.io>,
        Joel Fernandes <joel@joelfernandes.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andrei Vagin <avagin@google.com>,
        Jim Newsome <jnewsome@torproject.org>
References: <20210520183614.1227046-1-posk@google.com>
 <87mtspm7fe.fsf@meer.lwn.net>
 <CAPNVh5eV+CtY74_JMv6_Bm5aCVBh_F9hkWLT6v3BT=H0UwodUg@mail.gmail.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <c924d722-eee0-03ee-991d-c977089ecdbc@infradead.org>
Date:   Thu, 20 May 2021 17:15:41 -0700
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On 5/20/21 2:38 PM, Peter Oskolkov wrote:
> On Thu, May 20, 2021 at 2:17 PM Jonathan Corbet <corbet@lwn.net> wrote:
>>
>> Peter Oskolkov <posk@google.com> writes:
>>
>>> As indicated earlier in the FUTEX_SWAP patchset:
>>>
>>> https://lore.kernel.org/lkml/20200722234538.166697-1-posk@posk.io/
>>>
>>> "Google Fibers" is a userspace scheduling framework
>>> used widely and successfully at Google to improve in-process workload
>>> isolation and response latencies. We are working on open-sourcing
>>> this framework, and UMCG (User-Managed Concurrency Groups) kernel
>>> patches are intended as the foundation of this.
>>
>> So I have to ask...is there *any* documentation out there on what this
>> is and how people are supposed to use it?  Shockingly, typing "Google
>> fibers" into Google leads to a less than fully joyful outcome...  This
>> won't be easy for anybody to review if they have to start by
>> reverse-engineering what it's supposed to do.
> 
> Hi Jonathan,
> 
> There is this Linux Plumbers video: https://www.youtube.com/watch?v=KXuZi9aeGTw
> And the pdf: http://pdxplumbers.osuosl.org/2013/ocw//system/presentations/1653/original/LPC%20-%20User%20Threading.pdf
> 
> I did not reference them in the patchset because links to sites other
> than kernel.org are strongly discouraged... I will definitely add a
> documentation patch.

Certainly for links to email, we prefer to use lore.kernel.org archives.
Are links to other sites discouraged?  If so, that's news to me.


> Feel free to reach out to me directly or through this LKML thread if
> you have any questions.
> 
> Do you think a documentation patch would be useful at this point, as
> opposed to a free-form email discussion?

thanks.
-- 
~Randy