linux-kernel - Re: [LSF/MM TOPIC][LSF/MM,ATTEND] shared TLB, hugetlb reservations

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Message-ID: <c03e2254-4829-d872-d6f0-ed5d1a22ce89@oracle.com>
Date:   Mon, 3 Apr 2017 09:24:52 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     lsf-pc@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [LSF/MM TOPIC][LSF/MM,ATTEND] shared TLB, hugetlb reservations

On 04/03/2017 04:51 AM, Michal Hocko wrote:
> On Wed 08-03-17 17:30:55, Mike Kravetz wrote:
>> On 01/10/2017 03:02 PM, Mike Kravetz wrote:
>>> Another more concrete topic is hugetlb reservations.  Michal Hocko
>>> proposed the topic "mm patches review bandwidth", and brought up the
>>> related subject of areas in need of attention from an architectural
>>> POV.  I suggested that hugetlb reservations was one such area.  I'm
>>> guessing it was introduced to solve a rather concrete problem.  However,
>>> over time additional hugetlb functionality was added and the
>>> capabilities of the reservation code was stretched to accommodate.
>>> It would be good to step back and take a look at the design of this
>>> code to determine if a rewrite/redesign is necessary.  Michal suggested
>>> documenting the current design/code as a first step.  If people think
>>> this is worth discussion at the summit, I could put together such a
>>> design before the gathering.
>>
>> I attempted to put together a design/overview of how hugetlb reservations
>> currently work.  Hopefully, this will be useful.
> 
> I am still too busy to read through this carefuly and provide a useful
> feedback but I believe this should go int Documentation/vm/hugetlb$foo
> file. Care to send it as a patch please?

Sure

There is some incomplete information in the document, so I will make
some revisions and then send out as patch later this week.

-- 
Mike Kravetz