[Intel-gfx] [PATCH v6] mm, drm/i915: mark pinned shmemfs pages as unevictable

[Kuo-Hsin Yang]

On Tue, Nov 6, 2018 at 7:07 PM Chris Wilson <chris at chris-wilson.co.uk> wrote:
> This gave disappointing syslatency results until I put a cond_resched()
> here and moved the one in put_pages_gtt to before the page alloc, see
> https://patchwork.freedesktop.org/patch/260332/
>
> The last really nasty wart for syslatency is the spin in
> i915_gem_shrinker, for which I'm investigating
> https://patchwork.freedesktop.org/patch/260365/
>
> All 3 patches together give very reasonable syslatency results! (So
> good that it's time to find a new worst case scenario!)
>
> The challenge for the patch as it stands, is who lands it? We can take
> it through drm-intel (for merging in 4.21) but need Andrew's ack on top
> of all to agree with that path. Or we split the patch and only land the
> i915 portion once we backmerge the mm tree. I think pushing the i915
> portion through the mm tree is going to cause the most conflicts, so
> would recommend against that.

Splitting the patch and landing the mm part first sounds reasonable to me.