mm: add slab performance tests

This is a test of slab allocator performance tests.

Run as:
	modprobe slab_test

to execute.  Output will be written to the syslog.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
slab_test: disable concurrency test

The concurrency test had compile issues on my kernel.
Disable it for now, will fix it up some other time.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
slab_test: adjustments to make it compile concurrency tests

These adjustments seems enough to make the concurreny tests
of slab_test compile on my kernel.

I have not verified the output is correct.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>