From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id E626F6B0227 for ; Thu, 3 Jun 2010 11:23:09 -0400 (EDT) Date: Thu, 3 Jun 2010 17:21:43 +0200 From: Oleg Nesterov Subject: Re: [PATCH 08/12] oom: dump_tasks() use find_lock_task_mm() too Message-ID: <20100603152143.GA8005@redhat.com> References: <20100603135106.7247.A69D9226@jp.fujitsu.com> <20100603152350.725F.A69D9226@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100603152350.725F.A69D9226@jp.fujitsu.com> Sender: owner-linux-mm@kvack.org To: KOSAKI Motohiro Cc: "Luis Claudio R. Goncalves" , LKML , linux-mm , David Rientjes , Andrew Morton , KAMEZAWA Hiroyuki , Nick Piggin List-ID: On 06/03, KOSAKI Motohiro wrote: > > dump_task() should use find_lock_task_mm() too. It is necessary for > protecting task-exiting race. This patch also replaces the pointless do_each_thread() with for_each_process(), good. Reviewed-by: Oleg Nesterov > Signed-off-by: KOSAKI Motohiro > --- > mm/oom_kill.c | 37 ++++++++++++++++++++----------------- > 1 files changed, 20 insertions(+), 17 deletions(-) > > diff --git a/mm/oom_kill.c b/mm/oom_kill.c > index 35a2ecc..6360c56 100644 > --- a/mm/oom_kill.c > +++ b/mm/oom_kill.c > @@ -345,35 +345,38 @@ static struct task_struct *select_bad_process(unsigned long *ppoints, > */ > static void dump_tasks(const struct mem_cgroup *mem) > { > - struct task_struct *g, *p; > + struct task_struct *p; > + struct task_struct *task; > > printk(KERN_INFO "[ pid ] uid tgid total_vm rss cpu oom_adj " > "name\n"); > - do_each_thread(g, p) { > - struct mm_struct *mm; > > - if (mem && !task_in_mem_cgroup(p, mem)) > + for_each_process(p) { > + /* > + * We don't have is_global_init() check here, because the old > + * code do that. printing init process is not big matter. But > + * we don't hope to make unnecessary compatiblity breaking. > + */ > + if (p->flags & PF_KTHREAD) > continue; > - if (!thread_group_leader(p)) > + if (mem && !task_in_mem_cgroup(p, mem)) > continue; > > - task_lock(p); > - mm = p->mm; > - if (!mm) { > + task = find_lock_task_mm(p); > + if (!task) > /* > - * total_vm and rss sizes do not exist for tasks with no > - * mm so there's no need to report them; they can't be > - * oom killed anyway. > + * Probably oom vs task-exiting race was happen and ->mm > + * have been detached. thus there's no need to report them; > + * they can't be oom killed anyway. > */ > - task_unlock(p); > continue; > - } > + > printk(KERN_INFO "[%5d] %5d %5d %8lu %8lu %3d %3d %s\n", > - p->pid, __task_cred(p)->uid, p->tgid, mm->total_vm, > - get_mm_rss(mm), (int)task_cpu(p), p->signal->oom_adj, > + task->pid, __task_cred(task)->uid, task->tgid, task->mm->total_vm, > + get_mm_rss(task->mm), (int)task_cpu(task), task->signal->oom_adj, > p->comm); > - task_unlock(p); > - } while_each_thread(g, p); > + task_unlock(task); > + } > } > > static void dump_header(struct task_struct *p, gfp_t gfp_mask, int order, > -- > 1.6.5.2 > > > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org