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oom: make oom_unkillable_task() helper function

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Presently we have the same task check in two places. Unify it.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Minchan 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
KOSAKI Motohiro 2010-08-09 17:19:35 -07:00 committed by Linus Torvalds
parent 2c5ea53ce4
commit ab290adbaf
1 changed files with 22 additions and 11 deletions
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33
mm/oom_kill.c
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@ -101,6 +101,26 @@ static struct task_struct *find_lock_task_mm(struct task_struct *p)
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
* @p: task struct of which task we should calculate
@ -295,12 +315,7 @@ static struct task_struct *select_bad_process(unsigned long *ppoints,
for_each_process(p) {
unsigned long points;
/* skip the init task and kthreads */
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))
if (oom_unkillable_task(p, mem, nodemask))
continue;
/*
@ -467,11 +482,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
if (child->mm == p->mm)
continue;
if (child->flags & PF_KTHREAD)
continue;
if (mem && !task_in_mem_cgroup(child, mem))
continue;
if (!has_intersects_mems_allowed(child, nodemask))
if (oom_unkillable_task(p, mem, nodemask))
continue;
/* badness() returns 0 if the thread is unkillable */