[Intel-gfx] [PATCH] drm/i915: Do not invalidate obj->pages under mempressure

[Chris Wilson]

On Thu, Jan 15, 2015 at 08:36:15PM +0100, Daniel Vetter wrote:
> On Wed, Jan 14, 2015 at 9:34 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > This (partially) reverts
> >
> > commit 5537252b6b6d71fb1a8ed7395a8e5babf91953fd
> > Author: Chris Wilson <chris at chris-wilson.co.uk>
> > Date:   Tue Mar 25 13:23:06 2014 +0000
> >
> >     drm/i915: Invalidate our pages under memory pressure
> 
> Shouldn't we also revert the hunk in i915_gem_free_objects? Without
> the truncate vs. invalidate disdinction it seems to have lost it's
> reason for existence ...

No, setting MADV_DONTNEED has other nice properties during put_pages() -
I think it is useful in its own right, for example that is where my page
stealing code goes...
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre