linux-kernel - Re: [PATCH v7 05/24] mm: devmap: refactor 1-based refcounting for ZONE

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Message-ID: <c5f8750f-af82-8aec-ce70-116acf24fa82@nvidia.com>
Date:   Thu, 21 Nov 2019 00:54:53 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Christoph Hellwig <hch@....de>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, <bpf@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <kvm@...r.kernel.org>,
        <linux-block@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        <linuxppc-dev@...ts.ozlabs.org>, <netdev@...r.kernel.org>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v7 05/24] mm: devmap: refactor 1-based refcounting for
 ZONE_DEVICE pages

On 11/21/19 12:05 AM, Christoph Hellwig wrote:
> So while this looks correct and I still really don't see the major
> benefit of the new code organization, especially as it bloats all
> put_page callers.
> 
> I'd love to see code size change stats for an allyesconfig on this
> commit.
> 

Right, I'm running that now, will post the results. (btw, if there is
a script and/or standard format I should use, I'm all ears. I'll dig
through lwn...)



thanks,
-- 
John Hubbard
NVIDIA