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authorDavid Rientjes <rientjes@google.com>2008-02-07 00:14:06 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-07 08:42:19 -0800
commit4c4a22148909e4c003562ea7ffe0a06e26919e3c (patch)
treefa8b7d00e89f0eb4cdb4394dbc74d898810519aa /mm/memcontrol.c
parent4c6bc8dd5a0932f2c0b30a5f0a124464b7f614d0 (diff)
memcontrol: move oom task exclusion to tasklist scan
Creates a helper function to return non-zero if a task is a member of a memory controller: int task_in_mem_cgroup(const struct task_struct *task, const struct mem_cgroup *mem); When the OOM killer is constrained by the memory controller, the exclusion of tasks that are not a member of that controller was previously misplaced and appeared in the badness scoring function. It should be excluded during the tasklist scan in select_bad_process() instead. [akpm@linux-foundation.org: build fix] Cc: Christoph Lameter <clameter@sgi.com> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f6cdbf755ed..2fadd4896a1 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -170,6 +170,16 @@ static void __mem_cgroup_move_lists(struct page_cgroup *pc, bool active)
list_move(&pc->lru, &pc->mem_cgroup->inactive_list);
}
+int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
+{
+ int ret;
+
+ task_lock(task);
+ ret = task->mm && mm_cgroup(task->mm) == mem;
+ task_unlock(task);
+ return ret;
+}
+
/*
* This routine assumes that the appropriate zone's lru lock is already held
*/