linux-kernel - page pools, was Re: [PATCH v9 1/5] drm: Add a sharable drm page-pool implementation

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Date:   Wed, 7 Jul 2021 07:38:13 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     John Stultz <john.stultz@...aro.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        Christian Koenig <christian.koenig@....com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Chris Goldsworthy <cgoldswo@...eaurora.org>,
        Laura Abbott <labbott@...nel.org>,
        Brian Starkey <Brian.Starkey@....com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        ??rjan Eide <orjan.eide@....com>,
        Robin Murphy <robin.murphy@....com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Simon Ser <contact@...rsion.fr>,
        James Jones <jajones@...dia.com>, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Mel Gorman <mgorman@...e.de>,
        linux-mm@...ck.org
Subject: page pools, was Re: [PATCH v9 1/5] drm: Add a sharable drm page-pool
 implementation

On Wed, Jun 30, 2021 at 01:34:17AM +0000, John Stultz wrote:
> This adds a shrinker controlled page pool, extracted
> out of the ttm_pool logic, and abstracted out a bit
> so it can be used by other non-ttm drivers.

Can you explain in detail why you need a differnt page pool over the one
maintained by the page allocator?  Fragmenting the memory into all kinds
of pools has lots of downsides, so the upsides need to be explained in
detail.