1. 20 Dec, 2009 1 commit
    • Christoph Lameter's avatar
      SLUB: Use this_cpu operations in slub · 9dfc6e68
      Christoph Lameter authored
      Using per cpu allocations removes the needs for the per cpu arrays in the
      kmem_cache struct. These could get quite big if we have to support systems
      with thousands of cpus. The use of this_cpu_xx operations results in:
      
      1. The size of kmem_cache for SMP configuration shrinks since we will only
         need 1 pointer instead of NR_CPUS. The same pointer can be used by all
         processors. Reduces cache footprint of the allocator.
      
      2. We can dynamically size kmem_cache according to the actual nodes in the
         system meaning less memory overhead for configurations that may potentially
         support up to 1k NUMA nodes / 4k cpus.
      
      3. We can remove the diddle widdle with allocating and releasing of
         kmem_cache_cpu structures when bringing up and shutting down cpus. The cpu
         alloc logic will do it all for us. Removes some portions of the cpu hotplug
         functionality.
      
      4. Fastpath performance increases since per cpu pointer lookups and
         address calculations are avoided.
      
      V7-V8
      - Convert missed get_cpu_slab() under CONFIG_SLUB_STATS
      Signed-off-by: default avatarChristoph Lameter <cl@linux-foundation.org>
      Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
      9dfc6e68
  2. 18 Dec, 2009 9 commits
  3. 17 Dec, 2009 30 commits