linux-kernel - Re: [PATCH 0/2] put_user_page*(): start converting the call sites

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Date:   Tue, 4 Dec 2018 17:05:36 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     David Laight <David.Laight@...LAB.COM>,
        "'john.hubbard@...il.com'" <john.hubbard@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     Jan Kara <jack@...e.cz>, Tom Talpey <tom@...pey.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Benvenuti <benve@...co.com>,
        Christoph Hellwig <hch@...radead.org>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jerome Glisse <jglisse@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 0/2] put_user_page*(): start converting the call sites

On 12/4/18 9:10 AM, David Laight wrote:
> From: john.hubbard@...il.com
>> Sent: 04 December 2018 00:17
>>
>> Summary: I'd like these two patches to go into the next convenient cycle.
>> I *think* that means 4.21.
>>
>> Details
>>
>> At the Linux Plumbers Conference, we talked about this approach [1], and
>> the primary lingering concern was over performance. Tom Talpey helped me
>> through a much more accurate run of the fio performance test, and now
>> it's looking like an under 1% performance cost, to add and remove pages
>> from the LRU (this is only paid when dealing with get_user_pages) [2]. So
>> we should be fine to start converting call sites.
>>
>> This patchset gets the conversion started. Both patches already had a fair
>> amount of review.
> 
> Shouldn't the commit message contain actual details of the change?
> 

Hi David,

This "patch 0000" is not a commit message, as it never shows up in git log.
Each of the follow-up patches does have details about the changes it makes.

But maybe you are really asking for more background information, which I
should have added in this cover letter. Here's a start:

https://lore.kernel.org/r/20181110085041.10071-1-jhubbard@nvidia.com

...and it looks like this small patch series is not going to work out--I'm
going to have to fall back to another RFC spin. So I'll be sure to include 
you and everyone on that. Hope that helps.

thanks,
-- 
John Hubbard
NVIDIA