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authorPaul Jackson <pj@sgi.com>2005-09-06 18:18:13 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2005-09-07 19:57:40 -0400
commitef08e3b4981aebf2ba9bd7025ef7210e8eec07ce (patch)
tree3b5386e011c87dde384115c8eb0d6961c2536025 /include/linux/cpuset.h
parent9bf2229f8817677127a60c177aefce1badd22d7b (diff)
[PATCH] cpusets: confine oom_killer to mem_exclusive cpuset
Now the real motivation for this cpuset mem_exclusive patch series seems trivial. This patch keeps a task in or under one mem_exclusive cpuset from provoking an oom kill of a task under a non-overlapping mem_exclusive cpuset. Since only interrupt and GFP_ATOMIC allocations are allowed to escape mem_exclusive containment, there is little to gain from oom killing a task under a non-overlapping mem_exclusive cpuset, as almost all kernel and user memory allocation must come from disjoint memory nodes. This patch enables configuring a system so that a runaway job under one mem_exclusive cpuset cannot cause the killing of a job in another such cpuset that might be using very high compute and memory resources for a prolonged time. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/cpuset.h')
-rw-r--r--include/linux/cpuset.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 1fe1c3ebad30..24062a1dbf61 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -24,6 +24,7 @@ void cpuset_update_current_mems_allowed(void);
24void cpuset_restrict_to_mems_allowed(unsigned long *nodes); 24void cpuset_restrict_to_mems_allowed(unsigned long *nodes);
25int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl); 25int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
26extern int cpuset_zone_allowed(struct zone *z, unsigned int __nocast gfp_mask); 26extern int cpuset_zone_allowed(struct zone *z, unsigned int __nocast gfp_mask);
27extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
27extern struct file_operations proc_cpuset_operations; 28extern struct file_operations proc_cpuset_operations;
28extern char *cpuset_task_status_allowed(struct task_struct *task, char *buffer); 29extern char *cpuset_task_status_allowed(struct task_struct *task, char *buffer);
29 30
@@ -54,6 +55,11 @@ static inline int cpuset_zone_allowed(struct zone *z,
54 return 1; 55 return 1;
55} 56}
56 57
58static inline int cpuset_excl_nodes_overlap(const struct task_struct *p)
59{
60 return 1;
61}
62
57static inline char *cpuset_task_status_allowed(struct task_struct *task, 63static inline char *cpuset_task_status_allowed(struct task_struct *task,
58 char *buffer) 64 char *buffer)
59{ 65{