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Date: Wed, 16 Jun 2010 20:33:17 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> Cc: kosaki.motohiro@...fujitsu.com Subject: [PATCH 5/9] oom: make oom_unkillable_task() helper function Now, we have the same task check in three places. Unify it. Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> --- mm/oom_kill.c | 39 +++++++++++++++++++++++---------------- 1 files changed, 23 insertions(+), 16 deletions(-) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 3e48023..12204c7 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -276,6 +276,26 @@ static enum oom_constraint constrained_alloc(struct zonelist *zonelist, } #endif +/* 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; +} + /* * Simple selection loop. We chose the process with the highest * number of 'points'. We expect the caller will lock the tasklist. @@ -294,12 +314,7 @@ 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; /* @@ -440,11 +455,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, * When oom_kill_allocating_task is enabled, p can be * unkillable. check it first. */ - if (is_global_init(p) || (p->flags & PF_KTHREAD)) - return 1; - if (mem && !task_in_mem_cgroup(p, mem)) - return 1; - if (!has_intersects_mems_allowed(p, nodemask)) + if (oom_unkillable_task(p, mem, nodemask)) return 1; if (printk_ratelimit()) @@ -477,11 +488,7 @@ 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(child, mem, nodemask)) continue; /* oom_badness() returns 0 if the thread is unkillable */ -- 1.6.5.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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