linux-kernel - Re: [-mm patch] Show memcg information during OOM (v3)

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Date:	Wed, 4 Feb 2009 09:07:50 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [-mm patch] Show memcg information during OOM (v3)

* Li Zefan <lizf@...fujitsu.com> [2009-02-04 08:53:59]:

> > @@ -104,6 +104,8 @@ struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
> >  						      struct zone *zone);
> >  struct zone_reclaim_stat*
> >  mem_cgroup_get_reclaim_stat_from_page(struct page *page);
> > +extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
> > +					struct task_struct *p);
> >  
> >  #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
> >  extern int do_swap_account;
> > @@ -270,6 +272,10 @@ mem_cgroup_get_reclaim_stat_from_page(struct page *page)
> >  	return NULL;
> >  }
> >  
> > +void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
> > +{
> 
> should be static inline, otherwise it won't compile if CONFIG_CGROUP_MEM_CONT=n
> 

Oh! yes.

> > +}
> > +
> >  #endif /* CONFIG_CGROUP_MEM_CONT */
> >  
> 
> > +void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
> > +{
> > +	struct cgroup *task_cgrp;
> > +	struct cgroup *mem_cgrp;
> > +	/*
> > +	 * Need a buffer on stack, can't rely on allocations. The code relies
> 
> I think it's in .bss section, but not on stack, and it's better to explain why
> the static buffer is safe in the comment.
>

Yes, it is no longer on stack, in the original patch it was. I'll send
an updated patch 

-- 
	Balbir
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