Somebody in the thread at some point said:
I will give slabtop a go, but slabtop requires /proc/slabinfo which
requires kernel to be compiled with option CONFIG_SLAB which the
Fedora kernel and Linus' I compiled using the same configuration file
don't have. I will add it to future compiles of the kernel.
Hum seems Fedora uses the SLUB alternative. The kernel I am running
right now uses SLAB so.
-Andy