linux-kernel - Re: [PATCH v4 5/6] drm: Add fdinfo memory stats

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Message-ID: <CACvgo525ogS4LSZDUyaqjSqjJWj=qLRkphji5469=3obFXoMrQ@mail.gmail.com>
Date:   Fri, 21 Apr 2023 11:26:55 +0100
From:   Emil Velikov <emil.l.velikov@...il.com>
To:     Rob Clark <robdclark@...il.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Christopher Healy <healych@...zon.com>,
        Christian König <christian.koenig@....com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Clark <robdclark@...omium.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 5/6] drm: Add fdinfo memory stats

On Wed, 12 Apr 2023 at 23:43, Rob Clark <robdclark@...il.com> wrote:

> +/**
> + * enum drm_gem_object_status - bitmask of object state for fdinfo reporting
> + * @DRM_GEM_OBJECT_RESIDENT: object is resident in memory (ie. not unpinned)
> + * @DRM_GEM_OBJECT_PURGEABLE: object marked as purgeable by userspace
> + *
> + * Bitmask of status used for fdinfo memory stats, see &drm_gem_object_funcs.status
> + * and drm_show_fdinfo().  Note that an object can DRM_GEM_OBJECT_PURGEABLE if
> + * it still active or not resident, in which case drm_show_fdinfo() will not

nit: s/can/can be/;s/if it still/if it is still/

> + * account for it as purgeable.  So drivers do not need to check if the buffer
> + * is idle and resident to return this bit.  (Ie. userspace can mark a buffer
> + * as purgeable even while it is still busy on the GPU.. it does not _actually_
> + * become puregeable until it becomes idle.  The status gem object func does

nit: s/puregeable/purgeable/


I think we want a similar note in the drm-usage-stats.rst file.

With the above the whole series is:
Reviewed-by: Emil Velikov <emil.l.velikov@...il.com>

Fwiw: Keeping the i915 patch as part of this series would be great.
Sure i915_drm_client->id becomes dead code, but it's a piece one can
live with for a release or two. Then again it's not my call to make.

HTH
Emil