Commit ab290adb authored by KOSAKI Motohiro's avatar KOSAKI Motohiro Committed by Linus Torvalds

oom: make oom_unkillable_task() helper function

Presently we have the same task check in two places. Unify it.
Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: default avatarMinchan Kim <minchan.kim@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2c5ea53c
...@@ -101,6 +101,26 @@ static struct task_struct *find_lock_task_mm(struct task_struct *p) ...@@ -101,6 +101,26 @@ static struct task_struct *find_lock_task_mm(struct task_struct *p)
return NULL; return NULL;
} }
/* return true if the task is not adequate as candidate victim task. */
static bool oom_unkillable_task(struct task_struct *p, struct mem_cgroup *mem,
const nodemask_t *nodemask)
{
if (is_global_init(p))
return true;
if (p->flags & PF_KTHREAD)
return true;
/* When mem_cgroup_out_of_memory() and p is not member of the group */
if (mem && !task_in_mem_cgroup(p, mem))
return true;
/* p may not have freeable memory in nodemask */
if (!has_intersects_mems_allowed(p, nodemask))
return true;
return false;
}
/** /**
* badness - calculate a numeric value for how bad this task has been * badness - calculate a numeric value for how bad this task has been
* @p: task struct of which task we should calculate * @p: task struct of which task we should calculate
...@@ -295,12 +315,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints, ...@@ -295,12 +315,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
for_each_process(p) { for_each_process(p) {
unsigned long points; unsigned long points;
/* skip the init task and kthreads */ if (oom_unkillable_task(p, mem, nodemask))
if (is_global_init(p) || (p->flags & PF_KTHREAD))
continue;
if (mem && !task_in_mem_cgroup(p, mem))
continue;
if (!has_intersects_mems_allowed(p, nodemask))
continue; continue;
/* /*
...@@ -467,11 +482,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, ...@@ -467,11 +482,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
if (child->mm == p->mm) if (child->mm == p->mm)
continue; continue;
if (child->flags & PF_KTHREAD) if (oom_unkillable_task(p, mem, nodemask))
continue;
if (mem && !task_in_mem_cgroup(child, mem))
continue;
if (!has_intersects_mems_allowed(child, nodemask))
continue; continue;
/* badness() returns 0 if the thread is unkillable */ /* badness() returns 0 if the thread is unkillable */
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment