From 0e1e7c7a739562a321fda07c7cd2a97a7114f8f8 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 16 Oct 2007 01:25:38 -0700 Subject: Memoryless nodes: Use N_HIGH_MEMORY for cpusets cpusets try to ensure that any node added to a cpuset's mems_allowed is on-line and contains memory. The assumption was that online nodes contained memory. Thus, it is possible to add memoryless nodes to a cpuset and then add tasks to this cpuset. This results in continuous series of oom-kill and apparent system hang. Change cpusets to use node_states[N_HIGH_MEMORY] [a.k.a. node_memory_map] in place of node_online_map when vetting memories. Return error if admin attempts to write a non-empty mems_allowed node mask containing only memoryless-nodes. Signed-off-by: Lee Schermerhorn Signed-off-by: Bob Picco Signed-off-by: Nishanth Aravamudan Cc: KAMEZAWA Hiroyuki Cc: Mel Gorman Signed-off-by: Christoph Lameter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/cpuset.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/linux/cpuset.h') diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h index 826b15e914e2..9e633ea103ce 100644 --- a/include/linux/cpuset.h +++ b/include/linux/cpuset.h @@ -93,7 +93,7 @@ static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) return node_possible_map; } -#define cpuset_current_mems_allowed (node_online_map) +#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY]) static inline void cpuset_init_current_mems_allowed(void) {} static inline void cpuset_update_task_memory_state(void) {} #define cpuset_nodes_subset_current_mems_allowed(nodes) (1) -- cgit v1.2.1