Re: [PATCH v5 1/2] drm/panthor: Implement evicted status for GEM objects

[Nicolas Frattaroli <nicolas.frattaroli@collabora.com>]

On Thursday, 21 May 2026 15:51:15 Central European Summer Time Nicolas Frattaroli wrote:
> For fdinfo to be able to fill its evicted counter with data, panthor
> needs to keep track of whether a GEM object has ever been reclaimed.
> Just checking whether the pages are resident isn't enough, as newly
> allocated objects also won't be resident.
> 
> Do this with a new atomic_t member on panthor_gem_object. It's increased
> when an object gets evicted by the shrinker, and saturates at INT_MAX.
> This means that once an object has been evicted at least once, its
> reclaim counter will never return to 0.
> 
> Due to this, it's possible to distinguish evicted non-resident pages
> from newly allocated non-resident pages by checking whether
> reclaimed_count is != 0
> 
> Use this new member to then set the appropriate DRM_GEM_OBJECT_EVICTED
> status flag for fdinfo.
> 

Oops, feel free to drop this paragraph in the commit message when
applying.