Re: Memory leak in drm/i915?

[Chris Wilson <chris@chris-wilson.co.uk>]

On Wed, 3 Nov 2010 10:26:11 -0500, "Jason Detring" <jason.detring@navico.com> wrote:
> The problem observed is that performing this switch seems to grow system
> cache usage by about 1.5 to 2 MB per iteration.  This is unbounded, and
> will fill both free memory and swap in the course of a few hours when
> running our app in its demonstration cycle.  At this point, the system
> becomes unresponsive, eventually dumping the user to a text-mode kernel
> panic message.  Killing the app before the hang causes the system cache
> and swap to be cleared on an intel-drm-next kernel, but not in the -rc3
> kernel (see software stacks later in this message).

This suggests that the leak is connected with: 

commit 31dfbc93923c0aaa0440b809f80ff2830c6a531a
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Mon Sep 27 21:28:30 2010 +0100

    drm: Prune GEM vma entries
    
    Hook the GEM vm open/close ops into the generic drm vm open/close so
    that the private vma entries are created and destroy appropriately.
    Fixes the leak of the drm_vma_entries during the lifetime of the filp.

Can you monitor /sys/debug/dri/0/i915_gem_objects and /proc/slabinfo and
see where the memory is going?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre