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-rw-r--r--fs/proc/base.c5
-rw-r--r--include/linux/oom.h5
-rw-r--r--mm/oom_kill.c44
3 files changed, 22 insertions, 32 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index d2d3108a611c..d7d711876b6a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -411,12 +411,13 @@ static const struct file_operations proc_lstats_operations = {
static int proc_oom_score(struct task_struct *task, char *buffer)
{
+ unsigned long totalpages = totalram_pages + total_swap_pages;
unsigned long points = 0;
read_lock(&tasklist_lock);
if (pid_alive(task))
- points = oom_badness(task, NULL, NULL,
- totalram_pages + total_swap_pages);
+ points = oom_badness(task, NULL, NULL, totalpages) *
+ 1000 / totalpages;
read_unlock(&tasklist_lock);
return sprintf(buffer, "%lu\n", points);
}
diff --git a/include/linux/oom.h b/include/linux/oom.h
index 3d7647536b03..e4c29bc72e70 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -43,8 +43,9 @@ enum oom_constraint {
extern void compare_swap_oom_score_adj(int old_val, int new_val);
extern int test_set_oom_score_adj(int new_val);
-extern unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
- const nodemask_t *nodemask, unsigned long totalpages);
+extern unsigned long oom_badness(struct task_struct *p,
+ struct mem_cgroup *memcg, const nodemask_t *nodemask,
+ unsigned long totalpages);
extern int try_set_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
extern void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_flags);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 9f09a1fde9f9..ed0e19677360 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -180,10 +180,10 @@ static bool oom_unkillable_task(struct task_struct *p,
* predictable as possible. The goal is to return the highest value for the
* task consuming the most memory to avoid subsequent oom failures.
*/
-unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
- const nodemask_t *nodemask, unsigned long totalpages)
+unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
+ const nodemask_t *nodemask, unsigned long totalpages)
{
- long points;
+ unsigned long points;
if (oom_unkillable_task(p, memcg, nodemask))
return 0;
@@ -198,21 +198,11 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
}
/*
- * The memory controller may have a limit of 0 bytes, so avoid a divide
- * by zero, if necessary.
- */
- if (!totalpages)
- totalpages = 1;
-
- /*
* The baseline for the badness score is the proportion of RAM that each
* task's rss, pagetable and swap space use.
*/
- points = get_mm_rss(p->mm) + p->mm->nr_ptes;
- points += get_mm_counter(p->mm, MM_SWAPENTS);
-
- points *= 1000;
- points /= totalpages;
+ points = get_mm_rss(p->mm) + p->mm->nr_ptes +
+ get_mm_counter(p->mm, MM_SWAPENTS);
task_unlock(p);
/*
@@ -220,23 +210,20 @@ unsigned int oom_badness(struct task_struct *p, struct mem_cgroup *memcg,
* implementation used by LSMs.
*/
if (has_capability_noaudit(p, CAP_SYS_ADMIN))
- points -= 30;
+ points -= 30 * totalpages / 1000;
/*
* /proc/pid/oom_score_adj ranges from -1000 to +1000 such that it may
* either completely disable oom killing or always prefer a certain
* task.
*/
- points += p->signal->oom_score_adj;
+ points += p->signal->oom_score_adj * totalpages / 1000;
/*
- * Never return 0 for an eligible task that may be killed since it's
- * possible that no single user task uses more than 0.1% of memory and
- * no single admin tasks uses more than 3.0%.
+ * Never return 0 for an eligible task regardless of the root bonus and
+ * oom_score_adj (oom_score_adj can't be OOM_SCORE_ADJ_MIN here).
*/
- if (points <= 0)
- return 1;
- return (points < 1000) ? points : 1000;
+ return points ? points : 1;
}
/*
@@ -314,7 +301,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
- *ppoints = 0;
+ unsigned long chosen_points = 0;
do_each_thread(g, p) {
unsigned int points;
@@ -354,7 +341,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
*/
if (p == current) {
chosen = p;
- *ppoints = 1000;
+ chosen_points = ULONG_MAX;
} else if (!force_kill) {
/*
* If this task is not being ptraced on exit,
@@ -367,12 +354,13 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
}
points = oom_badness(p, memcg, nodemask, totalpages);
- if (points > *ppoints) {
+ if (points > chosen_points) {
chosen = p;
- *ppoints = points;
+ chosen_points = points;
}
} while_each_thread(g, p);
+ *ppoints = chosen_points * 1000 / totalpages;
return chosen;
}
@@ -572,7 +560,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask,
}
check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL);
- limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT;
+ limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT ? : 1;
read_lock(&tasklist_lock);
p = select_bad_process(&points, limit, memcg, NULL, false);
if (p && PTR_ERR(p) != -1UL)