[Intel-gfx] [PATCH v3] mm, drm/i915: mark pinned shmemfs pages as unevictable

[Dave Hansen]

On 11/2/18 6:22 AM, Vovo Yang wrote:
> On Thu, Nov 1, 2018 at 10:30 PM Dave Hansen <dave.hansen at intel.com> wrote:
>> On 11/1/18 5:06 AM, Vovo Yang wrote:
>>>> mlock() and ramfs usage are pretty easy to track down.  /proc/$pid/smaps
>>>> or /proc/meminfo can show us mlock() and good ol' 'df' and friends can
>>>> show us ramfs the extent of pinned memory.
>>>>
>>>> With these, if we see "Unevictable" in meminfo bump up, we at least have
>>>> a starting point to find the cause.
>>>>
>>>> Do we have an equivalent for i915?
> Chris helped to answer this question:
> Though it includes a few non-shmemfs objects, see
> debugfs/dri/0/i915_gem_objects and the "bound objects".
> 
> Example i915_gem_object output:
>   591 objects, 95449088 bytes
>   55 unbound objects, 1880064 bytes
>   533 bound objects, 93040640 bytes

Do those non-shmemfs objects show up on the unevictable list?  How far
can the amount of memory on the unevictable list and the amount
displayed in this "bound objects" value diverge?