linux-kernel - Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

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Date:	Mon, 16 Oct 2006 09:08:30 +0000
From:	Mike Galbraith <efault@....de>
To:	Catalin Marinas <catalin.marinas@...il.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	"nmeyers@...tmark.com" <nmeyers@...tmark.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

On Mon, 2006-10-16 at 09:07 +0100, Catalin Marinas wrote:
> On 16/10/06, Mike Galbraith <efault@....de> wrote:
> > On Sun, 2006-10-15 at 07:59 +0000, Mike Galbraith wrote:
> >
> > > 2.6.19-rc1 + patch-2.6.19-rc1-kmemleak-0.11 compiles fine now (unless
> > > CONFIG_DEBUG_KEEP_INIT is set), boots and runs too.. but axle grease
> > > runs a lot faster ;-)  I'll try a stripped down config sometime.
> >
> > My roughly three orders of magnitude (amusing to watch:) boot slowdown
> > turned out to be stack unwinding.  With CONFIG_UNWIND_INFO disabled,
> > 2.6.19-rc2 + patch-2.6.19-rc1-kmemleak-0.11 runs just fine.
> 
> Kmemleak introduces some overhead but shouldn't be that bad.
> DEBUG_SLAB also introduces an overhead by erasing the data in the
> allocated blocks.

2.6.18 with your rc6 patch booted normally with stack unwind enabled.

	-Mike 

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