Re: [-mm patch] Show memcg information during OOM

[David Rientjes]

On Tue, 3 Feb 2009, Balbir Singh wrote:

> > > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > > index d3b9bac..b8e53ae 100644
> > > --- a/mm/oom_kill.c
> > > +++ b/mm/oom_kill.c
> > > @@ -392,6 +392,7 @@ static int oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order,
> > >  			current->comm, gfp_mask, order, current->oomkilladj);
> > >  		task_lock(current);
> > >  		cpuset_print_task_mems_allowed(current);
> > > +		mem_cgroup_print_mem_info(mem);
> > 
> > I think this can be put outside the task lock. The lock is used to call task_cs() safely in
> > cpuset_print_task_mems_allowed().
> >
> 
> Thanks, I'll work on that in the next version.
>  

I was also wondering about this and assumed that it was necessary to 
prevent the cgroup from disappearing during the oom.  If task_lock() isn't 
held, is the memcg->css.cgroup->dentry->d_name.name dereference always 
safe without rcu?
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