linux-kernel - Re: 2.6.33.2 kmalloc-8 slab leaks ~512 objects per second

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Date:	Wed, 12 May 2010 14:37:44 +0100
From:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
To:	Jerome Glisse <glisse@...edesktop.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.sourceforge.net" <dri-devel@...ts.sourceforge.net>
Subject: Re: 2.6.33.2 kmalloc-8 slab leaks ~512 objects per second


[Snipped localdomain guy from Cc]

On Wednesday 12 May 2010 14:29:16 Jerome Glisse wrote:
> On Wed, May 12, 2010 at 11:50:41AM +0100, Tvrtko Ursulin wrote:
> > On Wednesday 12 May 2010 11:38:05 Tvrtko Ursulin wrote:
> >
> > [snip]
> >
> > > I think it is DRM (radeon) related, leak stopped when I closed all X
> > >  programs. I am compiling 2.6.33.3 right now and will soon reboot into
> > > it.
> >
> > Leak is still present in 2.6.33.3 - the more GUI activity the more it
> > leaks. So the ~512 objects per second was with xosview running, but
> > moving windows or browsing through menus can leak a lot more (per
> > second).
> >
> > Is version of userspace drm library interesting? It is 2.4.20
> > (libdrm-2.4.20-12.1.x86_64).
> >
> > Tvrtko
>
> Do the number of object stay constant over longuer period of time
> (30min, 1hour) ? If there was a leak i think we would have notice
> it by now, some of my desktop are running 24h for several days with
> radeon kms.

No, it grew constantly in presence of compositing activity under X by 512 8
byte objects per second or more, possibly multiples of 512 or very close.

If you haven't seen my original  post, kmalloc-8 cache after some days of
uptime looked like this:

kmalloc-8         68044800 68044800      8  512    1 : tunables    0    0    0
: slabdata 132900 132900      0

I am now running 2.6.34-rc7 which seems not to leak.

Tvrtko

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