[dm-devel] [PATCH] slab: implement kmalloc guard

[Christoph Lameter]

On Mon, 8 Sep 2014, Mikulas Patocka wrote:

> I don't know what you mean. If someone allocates 10000 objects with sizes
> from 1 to 10000, you can't have 10000 slab caches - you can't have a slab
> cache for each used size. Also - you can't create a slab cache in
> interrupt context.

Oh you can create them up front on bootup. And I think only the small
sizes matter. Allocations >=8K are pushed to the page allocator anyways.

> > We already have a redzone structure to check for writes over the end of
> > the object. Lets use that.
>
> So, change all three slab subsystems to use that.

SLOB has no debugging features and I think that was intentional. We are
trying to unify the debug checks etc. Some work on that would be
appreciated. I think the kmalloc creation is already in slab_common.c