# Re: \[PATCH 00/34\] put\_user\_pages(): miscellaneous call sites

- From: Peter Zijlstra \<peterz@infradead.org\>
- Date: 2019-08-02 08:07:29 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2019/08/160249
- Thread: https://ratatoskr.run/amd-gfx/2019/08/160198/t.md

```text
On Thu, Aug 01, 2019 at 07:16:19PM -0700, john.hubbard@gmail.com 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.
```