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From: David Laight <David.Laight@ACULAB.COM>
Subject: RE: [PATCH 0/2] put_user_page*(): start converting the call sites
Date: Tue, 4 Dec 2018 17:10:28 +0000
Message-ID: <b31c7b3359344e778fc525013eeece64@AcuMS.aculab.com>
References: <20181204001720.26138-1-jhubbard@nvidia.com>
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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>

From: john.hubbard@gmail.com
> Sent: 04 December 2018 00:17
>=20
> Summary: I'd like these two patches to go into the next convenient cycle.
> I *think* that means 4.21.
>=20
> Details
>=20
> 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.
>=20
> This patchset gets the conversion started. Both patches already had a fai=
r
> amount of review.

Shouldn't the commit message contain actual details of the change?

=09David

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