linux-kernel - Re: [RFC v4 5/8] dmabuf: Add gpu cgroup charge transfer function

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Message-ID: <20220329152142.GA15794@blackbody.suse.cz>
Date:   Tue, 29 Mar 2022 17:21:42 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     "T.J. Mercier" <tjmercier@...gle.com>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <brauner@...nel.org>,
        Hridya Valsaraju <hridya@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian König <christian.koenig@....com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        John Stultz <john.stultz@...aro.org>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Shuah Khan <shuah@...nel.org>, kaleshsingh@...gle.com,
        Kenny.Ho@....com, skhan@...uxfoundation.org,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, cgroups@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [RFC v4 5/8] dmabuf: Add gpu cgroup charge transfer function

Hi.

On Mon, Mar 28, 2022 at 03:59:44AM +0000, "T.J. Mercier" <tjmercier@...gle.com> wrote:
> From: Hridya Valsaraju <hridya@...gle.com>
> 
> The dma_buf_charge_transfer function provides a way for processes to

(s/dma_bug_charge_transfer/dma_bug_transfer_charge/)

> transfer charge of a buffer to a different process. This is essential
> for the cases where a central allocator process does allocations for
> various subsystems, hands over the fd to the client who requested the
> memory and drops all references to the allocated memory.

I understood from [1] some buffers are backed by regular RAM. How are
these charges going to be transferred (if so)?


Thanks,
Michal

[1]
https://lore.kernel.org/r/CABdmKX2NSAKMC6rReMYfo2SSVNxEXcS466hk3qF6YFt-j-+_NQ@mail.gmail.com