| commit | 778d3b0ff0654ad7092bf823fd32010066b12365 | [log] [tgz] |
|---|---|---|
| author | Michal Hocko <[email protected]> | Tue Jul 26 16:08:30 2011 -0700 |
| committer | Linus Torvalds <[email protected]> | Tue Jul 26 16:49:43 2011 -0700 |
| tree | cd0073d8c513e1c56fd6950c4ec985f16fd004ad | |
| parent | 8521fc50d433507a7cdc96bec280f9e5888a54cc [diff] |
cpusets: randomize node rotor used in cpuset_mem_spread_node() [ This patch has already been accepted as commit 0ac0c0d0f837 but later reverted (commit 35926ff5fba8) because it itroduced arch specific __node_random which was defined only for x86 code so it broke other archs. This is a followup without any arch specific code. Other than that there are no functional changes.] Some workloads that create a large number of small files tend to assign too many pages to node 0 (multi-node systems). Part of the reason is that the rotor (in cpuset_mem_spread_node()) used to assign nodes starts at node 0 for newly created tasks. This patch changes the rotor to be initialized to a random node number of the cpuset. [[email protected]: fix layout] [[email protected]: Define stub numa_random() for !NUMA configuration] [[email protected]: Make it arch independent] [[email protected]: fix CONFIG_NUMA=y, MAX_NUMNODES>1 build] Signed-off-by: Jack Steiner <[email protected]> Signed-off-by: Lee Schermerhorn <[email protected]> Signed-off-by: Michal Hocko <[email protected]> Reviewed-by: KOSAKI Motohiro <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Paul Menage <[email protected]> Cc: Jack Steiner <[email protected]> Cc: Robin Holt <[email protected]> Cc: David Rientjes <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: David Rientjes <[email protected]> Cc: Jack Steiner <[email protected]> Cc: KOSAKI Motohiro <[email protected]> Cc: Lee Schermerhorn <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Paul Menage <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: Robin Holt <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>