linux-kernel - Re: Kswapd in 3.2.0-rc5 is a CPU hog

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Message-Id: <20111227092052.f2b02637.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 27 Dec 2011 09:20:52 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	"Nikolay S." <nowhere@...kenden.ath.cx>,
	Dave Chinner <david@...morbit.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: Kswapd in 3.2.0-rc5 is a CPU hog

On Mon, 26 Dec 2011 20:35:46 +0800
Hillf Danton <dhillf@...il.com> wrote:

> On Sun, Dec 25, 2011 at 6:21 PM, Nikolay S. <nowhere@...kenden.ath.cx> wrote:
> >
> > Uhm.., is this patch against 3.2-rc4? I can not apply it. There's no
> > mem_cgroup_lru_del_list(), but void mem_cgroup_del_lru_list(). Should I
> > place changes there?
> >
> > And also, -rc7 is here. May the problem be addressed as part of some
> > ongoing work? Is there any reason to try -rc7 (the problem requires
> > several days of uptime to become obvious)?
> >
> 
> Sorry, Nikolay, it is not based on the -next, nor on the -rc5(I assumed it was).
> The following is based on -next, and if you want to test -rc5, please
> grep MEM_CGROUP_ZSTAT mm/memcontrol.c and change it.
> 
> Best regard
> 

Hmm ? memcg is used ? Why do you consider this will be a help ?

Thanks,
-Kame

> Hillf
> ---
> 
> --- a/mm/memcontrol.c	Mon Dec 26 20:34:38 2011
> +++ b/mm/memcontrol.c	Mon Dec 26 20:37:54 2011
> @@ -1076,7 +1076,11 @@ void mem_cgroup_lru_del_list(struct page
>  	VM_BUG_ON(!memcg);
>  	mz = page_cgroup_zoneinfo(memcg, page);
>  	/* huge page split is done under lru_lock. so, we have no races. */
> -	MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
> +	if (WARN_ON_ONCE(MEM_CGROUP_ZSTAT(mz, lru) <
> +				(1 << compound_order(page))))
> +		MEM_CGROUP_ZSTAT(mz, lru) = 0;
> +	else
> +		MEM_CGROUP_ZSTAT(mz, lru) -= 1 << compound_order(page);
>  }
> 
>  void mem_cgroup_lru_del(struct page *page)
> 
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