From ab290adbaf8f46770f014ea87968de5baca29c30 Mon Sep 17 00:00:00 2001 From: KOSAKI Motohiro Date: Mon, 9 Aug 2010 17:19:35 -0700 Subject: oom: make oom_unkillable_task() helper function Presently we have the same task check in two places. Unify it. Signed-off-by: KOSAKI Motohiro Reviewed-by: Minchan Kim Cc: David Rientjes Cc: KAMEZAWA Hiroyuki Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/oom_kill.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) (limited to 'mm') diff --git a/mm/oom_kill.c b/mm/oom_kill.c index b9816ea2eb8f..2c993e47487f 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -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 */ -- cgit v1.2.3