linux-kernel - Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites

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Message-ID: <8968c928-5712-03a9-68df-051f5b58fdbc@nvidia.com>
Date:   Fri, 2 Aug 2019 12:33:13 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Peter Zijlstra <peterz@...radead.org>, <john.hubbard@...il.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Jérôme Glisse <jglisse@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <amd-gfx@...ts.freedesktop.org>, <ceph-devel@...r.kernel.org>,
        <devel@...verdev.osuosl.org>, <devel@...ts.orangefs.org>,
        <dri-devel@...ts.freedesktop.org>,
        <intel-gfx@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
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        <rds-devel@....oracle.com>, <sparclinux@...r.kernel.org>,
        <x86@...nel.org>, <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 00/34] put_user_pages(): miscellaneous call sites

On 8/2/19 1:05 AM, Peter Zijlstra wrote:
> On Thu, Aug 01, 2019 at 07:16:19PM -0700, john.hubbard@...il.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