From: Andrey Ryabinin <aryabi...@virtuozzo.com>
Use memcg's limits of task to show /proc/<pid>/oom_score.
Note: in vz7 we had different behavior. It showed 'oom_score'
based on 've->memcg' limits of process reading oom_score.
Now we look at memcg of <pid> process and don't care about the
current one. It seems more correct behaviour.
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
(cherry picked from vz8 commit 43e606413dfbabf139af6f31737b159b8d6d87b3)
Signed-off-by: Andrey Zhadchenko <andrey.zhadche...@virtuozzo.com>
---
fs/proc/base.c | 8 +++++++-
include/linux/memcontrol.h | 11 +++++++++++
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index ff7b277..e91b514 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -546,10 +546,16 @@ static ssize_t lstats_write(struct file *file, const char
__user *buf,
static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
- unsigned long totalpages = totalram_pages() + total_swap_pages;
+ unsigned long totalpages;
unsigned long points = 0;
+ struct mem_cgroup *memcg;
long badness;
+ rcu_read_lock();
+ memcg = mem_cgroup_from_task(task);
+ totalpages = mem_cgroup_total_pages(memcg);
+ rcu_read_unlock();
+
badness = oom_badness(task, totalpages, NULL);
/*
* Special case OOM_SCORE_ADJ_MIN for all others scale the
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 55313db..84bacc5 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -931,6 +931,17 @@ unsigned long mem_cgroup_get_zone_lru_size(struct lruvec
*lruvec,
return READ_ONCE(mz->lru_zone_size[zone_idx][lru]);
}
+static inline unsigned long mem_cgroup_total_pages(struct mem_cgroup *memcg)
+{
+ unsigned long ram, ram_swap;
+ extern long total_swap_pages;
+
+ ram = min_t(unsigned long, totalram_pages(), memcg->memory.max);
+ ram_swap = min_t(unsigned long, memcg->memsw.max, ram +
total_swap_pages);
+
+ return ram_swap;
+}
+
void mem_cgroup_handle_over_high(void);
unsigned long mem_cgroup_get_max(struct mem_cgroup *memcg);
--
1.8.3.1
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