Re: Major slab mem leak with 2.6.17 / GCC 4.1.1

[Catalin Marinas]

On 16/10/06, Mike Galbraith <efault@xxxxxx> 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.

Note that if the allocated blocks are added to a list and never
removed, kmemleak won't be able to detect the leak as the objects are
stilled referred. In this case, you can only use DEBUG_SLAB_LEAK.

--
Catalin
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