linux-kernel - Re: [PATCH v7 4/5] drm/drm_file: Add DRM obj's RSS reporting function for fdinfo

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Message-ID: <df035e27-b19e-fd4c-d31c-316d526afc4f@collabora.com>
Date:   Thu, 28 Sep 2023 13:24:48 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Adrián Larumbe <adrian.larumbe@...labora.com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        robdclark@...il.com, quic_abhinavk@...cinc.com,
        dmitry.baryshkov@...aro.org, sean@...rly.run,
        marijn.suijten@...ainline.org, robh@...nel.org,
        steven.price@....com
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        healych@...zon.com, kernel@...labora.com,
        tvrtko.ursulin@...ux.intel.com, boris.brezillon@...labora.com
Subject: Re: [PATCH v7 4/5] drm/drm_file: Add DRM obj's RSS reporting function
 for fdinfo

Il 27/09/23 23:29, Adrián Larumbe ha scritto:
> Some BO's might be mapped onto physical memory chunkwise and on demand,
> like Panfrost's tiler heap. In this case, even though the
> drm_gem_shmem_object page array might already be allocated, only a very
> small fraction of the BO is currently backed by system memory, but
> drm_show_memory_stats will then proceed to add its entire virtual size to
> the file's total resident size regardless.
> 
> This led to very unrealistic RSS sizes being reckoned for Panfrost, where
> said tiler heap buffer is initially allocated with a virtual size of 128
> MiB, but only a small part of it will eventually be backed by system memory
> after successive GPU page faults.
> 
> Provide a new DRM object generic function that would allow drivers to
> return a more accurate RSS and purgeable sizes for their BOs.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> Reviewed-by: Steven Price <steven.price@....com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>