linux-kernel - Re: [RFC 10/12] cgroup/drm: Introduce weight based drm cgroup control

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Message-ID: <Y9wWTspETnYYodDc@slm.duckdns.org>
Date:   Thu, 2 Feb 2023 10:00:14 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc:     Intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        Johannes Weiner <hannes@...xchg.org>,
        Zefan Li <lizefan.x@...edance.com>,
        Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Rob Clark <robdclark@...omium.org>,
        Stéphane Marchesin <marcheu@...omium.org>,
        "T . J . Mercier" <tjmercier@...gle.com>, Kenny.Ho@....com,
        Christian König <christian.koenig@....com>,
        Brian Welty <brian.welty@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Subject: Re: [RFC 10/12] cgroup/drm: Introduce weight based drm cgroup control

Hello,

On Thu, Feb 02, 2023 at 02:26:06PM +0000, Tvrtko Ursulin wrote:
> When you say active/inactive - to what you are referring in the cgroup
> world? Offline/online? For those my understanding was offline was a
> temporary state while css is getting destroyed.

Oh, it's just based on activity. So, for example, iocost puts a cgroup on
its active list which is canned periodically when an IO is issued from an
inactive cgroup. If an active cgroup doesn't have any activity between two
scans, it becomes inactive and dropped from the list. drm can prolly use the
same approach?

> Also, I am really postponing implementing those changes until I hear at
> least something from the DRM community.

Yeah, that sounds like a good idea.

Thanks.

-- 
tejun