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Re: [Xen-devel] [PATCH 00/34] put_user_pages(): miscellaneous call sites
- To: john.hubbard@xxxxxxxxx
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Fri, 2 Aug 2019 10:05:54 +0200
- Cc: linux-fbdev@xxxxxxxxxxxxxxx, Jan Kara <jack@xxxxxxx>, kvm@xxxxxxxxxxxxxxx, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, Ira Weiny <ira.weiny@xxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, devel@xxxxxxxxxxxxxxxxxxxx, rds-devel@xxxxxxxxxxxxxx, linux-rdma@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, amd-gfx@xxxxxxxxxxxxxxxxxxxxx, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, devel@xxxxxxxxxxxxxxxxxx, linux-media@xxxxxxxxxxxxxxx, John Hubbard <jhubbard@xxxxxxxxxx>, intel-gfx@xxxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, Jérôme Glisse <jglisse@xxxxxxxxxx>, linux-rpi-kernel@xxxxxxxxxxxxxxxxxxx, ceph-devel@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, linux-xfs@xxxxxxxxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 02 Aug 2019 08:06:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, Aug 01, 2019 at 07:16:19PM -0700, john.hubbard@xxxxxxxxx wrote:
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions"). That commit
> has an extensive description of the problem and the planned steps to
> solve it, but the highlites are:
That is one horridly mangled Changelog there :-/ It looks like it's
partially duplicated.
Anyway; no objections to any of that, but I just wanted to mention that
there are other problems with long term pinning that haven't been
mentioned, notably they inhibit compaction.
A long time ago I proposed an interface to mark pages as pinned, such
that we could run compaction before we actually did the pinning.
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