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| author | David Rientjes <rientjes@google.com> | 2008-02-07 00:14:06 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-07 08:42:19 -0800 |
| commit | 4c4a22148909e4c003562ea7ffe0a06e26919e3c (patch) | |
| tree | fa8b7d00e89f0eb4cdb4394dbc74d898810519aa /mm | |
| parent | 4c6bc8dd5a0932f2c0b30a5f0a124464b7f614d0 (diff) | |
| download | lwn-4c4a22148909e4c003562ea7ffe0a06e26919e3c.tar.gz lwn-4c4a22148909e4c003562ea7ffe0a06e26919e3c.zip | |
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')
| -rw-r--r-- | mm/memcontrol.c | 10 | ||||
| -rw-r--r-- | mm/oom_kill.c | 9 |
2 files changed, 12 insertions, 7 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f6cdbf755ed3..2fadd4896a14 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 */ diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 64751dc9d997..ef5084dbc793 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -65,13 +65,6 @@ unsigned long badness(struct task_struct *p, unsigned long uptime, return 0; } -#ifdef CONFIG_CGROUP_MEM_CONT - if (mem != NULL && mm->mem_cgroup != mem) { - task_unlock(p); - return 0; - } -#endif - /* * The memory size of the process is the basis for the badness. */ @@ -223,6 +216,8 @@ static struct task_struct *select_bad_process(unsigned long *ppoints, /* skip the init task */ if (is_global_init(p)) continue; + if (mem && !task_in_mem_cgroup(p, mem)) + continue; /* * This task already has access to memory reserves and is |