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

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Message-ID: <b31c7b3359344e778fc525013eeece64@AcuMS.aculab.com>
Date:   Tue, 4 Dec 2018 17:10:28 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'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>,
        John Hubbard <jhubbard@...dia.com>
Subject: RE: [PATCH 0/2] put_user_page*(): start converting the call sites

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?

	David

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