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Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites
To:     Peter Zijlstra <peterz@infradead.org>, <john.hubbard@gmail.com>
CC:     Andrew Morton <akpm@linux-foundation.org>,
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From:   John Hubbard <jhubbard@nvidia.com>
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On 8/2/19 1:05 AM, Peter Zijlstra wrote:
> 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.

Yeah. It took so long to merge that I think I was no longer able to
actually see the commit description, after N readings. sigh

> 
> 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.
> 

This is all heading toward marking pages as pinned, so we should finally
get there.  I'll post the RFC for tracking pinned pages shortly.


thanks,
-- 
John Hubbard
NVIDIA