Over the past couple of weeks we've been doing some basic performance
testing of the rmap overhead.  For this I put together a rollup patch
against 2.5.26 that includes what I'd consider basic rmap.  As a reference,
I'm also posting the patch here, so people can see what it consists of.

The list of patches included are:

	minrmap		The original minimal rmap patch
	truncate_leak		A bug fix
	dmc_optimize		Don't allocate pte_chain for one mapping
	vmstat			Add rmap statistics for vmstat
	ptechain slab		Allocate pte_chains from a slab
	daniel_rmap_speedup	Use hashed pte_chain locks
	akpm_rmap_speedup	Make pte_chain hold multiple pte ptrs

Again, this patch applies against 2.5.26, and clearly does not include many
of the recent rmap optimizations.

Dave McCracken

======================================================================
Dave McCracken          IBM Linux Base Kernel Team      1-512-838-3059
dmccr@us.ibm.com                                        T/L   678-3059