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From:   David Laight <David.Laight@ACULAB.COM>
To:     "'john.hubbard@gmail.com'" <john.hubbard@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>
CC:     Jan Kara <jack@suse.cz>, Tom Talpey <tom@talpey.com>,
        Al Viro <viro@zeniv.linux.org.uk>,
        Christian Benvenuti <benve@cisco.com>,
        "Christoph Hellwig" <hch@infradead.org>,
        Christopher Lameter <cl@linux.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dennis Dalessandro <dennis.dalessandro@intel.com>,
        Doug Ledford <dledford@redhat.com>,
        "Jason Gunthorpe" <jgg@ziepe.ca>,
        Jerome Glisse <jglisse@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        Michal Hocko <mhocko@kernel.org>,
        Mike Marciniszyn <mike.marciniszyn@intel.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        LKML <linux-kernel@vger.kernel.org>,
        "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        John Hubbard <jhubbard@nvidia.com>
Subject: RE: [PATCH 0/2] put_user_page*(): start converting the call sites
Thread-Topic: [PATCH 0/2] put_user_page*(): start converting the call sites
Thread-Index: AQHUi2bDGCD6zYfsq0K8yN3qDVFoEKVu0VeA
Date:   Tue, 4 Dec 2018 17:10:28 +0000
Message-ID: <b31c7b3359344e778fc525013eeece64@AcuMS.aculab.com>
References: <20181204001720.26138-1-jhubbard@nvidia.com>
In-Reply-To: <20181204001720.26138-1-jhubbard@nvidia.com>
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From: john.hubbard@gmail.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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