Introduce a per-memory-cgroup oom_score_adj setting.
A read-write single value file which exits on non-root
cgroups. The default is "0".
It will have a similar meaning to a per-process value,
available via /proc/<pid>/oom_score_adj.
Should be in a range [-1000, 1000].
Signed-off-by: Roman Gushchin <guro@xxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Li Zefan <lizefan@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: kernel-team@xxxxxx
Cc: cgroups@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
---
include/linux/memcontrol.h | 3 +++
mm/memcontrol.c | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 8a308c9..818a42e 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -198,6 +198,9 @@ struct mem_cgroup {
/* kill all tasks below in case of OOM */
bool oom_kill_all_tasks;
+ /* OOM kill score adjustment */
+ short oom_score_adj;
+
/* handle for "memory.events" */
struct cgroup_file events_file;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d4ffa79..f979ac7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5183,6 +5183,36 @@ static ssize_t memory_oom_kill_all_tasks_write(struct kernfs_open_file *of,
return nbytes;
}
+static int memory_oom_score_adj_show(struct seq_file *m, void *v)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
+ short oom_score_adj = memcg->oom_score_adj;
+
+ seq_printf(m, "%d\n", oom_score_adj);
+
+ return 0;
+}
+
+static ssize_t memory_oom_score_adj_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
+ int oom_score_adj;
+ int err;
+
+ err = kstrtoint(strstrip(buf), 0, &oom_score_adj);
+ if (err)
+ return err;
+
+ if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
+ oom_score_adj > OOM_SCORE_ADJ_MAX)
+ return -EINVAL;
+
+ memcg->oom_score_adj = (short)oom_score_adj;
+
+ return nbytes;
+}
+
static int memory_events_show(struct seq_file *m, void *v)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(seq_css(m));
@@ -5298,6 +5328,12 @@ static struct cftype memory_files[] = {
.write = memory_oom_kill_all_tasks_write,
},
{
+ .name = "oom_score_adj",
+ .flags = CFTYPE_NOT_ON_ROOT,
+ .seq_show = memory_oom_score_adj_show,
+ .write = memory_oom_score_adj_write,
+ },
+ {
.name = "events",
.flags = CFTYPE_NOT_ON_ROOT,
.file_offset = offsetof(struct mem_cgroup, events_file),
--
2.7.4
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