linux-kernel - Re: [PATCH 1/2] memcg clean up try

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Date:	Thu, 3 Jun 2010 19:38:09 +0900
From:	Daisuke Nishimura <d-nishimura@....biglobe.ne.jp>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [PATCH 1/2] memcg clean up try_charge main loop

One more comment.

> +	ret = res_counter_charge(&mem->res, csize, &fail_res);
> +
> +	if (likely(!ret)) {
> +		if (!do_swap_account)
> +			return CHARGE_OK;
> +		ret = res_counter_charge(&mem->memsw, csize, &fail_res);
> +		if (likely(!ret))
> +			return CHARGE_OK;
> +
> +		mem_over_limit = mem_cgroup_from_res_counter(fail_res, res);
This must be mem_cgroup_from_res_counter(fail_res, memsw).
We will access to an invalid pointer, otherwise.

> +		flags |= MEM_CGROUP_RECLAIM_NOSWAP;
> +	} else
> +		mem_over_limit = mem_cgroup_from_res_counter(fail_res, res);
> +

Thanks,
Daisuke Nishimura.
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