linux-kernel - Re: [dm-devel] Re: [PATCH 0/8] I/O bandwidth controller and BIO tracking

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Date:	Thu, 13 Nov 2008 21:50:31 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Hirokazu Takahashi <taka@...inux.co.jp>
CC:	kamezawa.hiroyu@...fujitsu.com, Paul Menage <menage@...gle.com>,
	xen-devel@...ts.xensource.com,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, dm-devel@...hat.com,
	agk@...rceware.org, fernando@....ntt.co.jp, xemul@...nvz.org
Subject: Re: [dm-devel] Re: [PATCH 0/8] I/O bandwidth controller and BIO tracking

Hirokazu Takahashi wrote:
> Hi, Kamezawa-san,
> 
> This patch makes the page_cgroup framework be able to be used even if
> the compile option of the cgroup memory controller is off.
> So bio-cgroup can use this framework without the memory controller.
> 
> Signed-off-by: Hirokazu Takahashi <taka@...inux.co.jp>
> 
> diff -dupr linux-2.6.28-rc2.bc0/include/linux/memcontrol.h linux-2.6.28-rc2/include/linux/memcontrol.h
> --- linux-2.6.28-rc2.bc0/include/linux/memcontrol.h	2008-11-10 18:31:34.000000000 +0900
> +++ linux-2.6.28-rc2/include/linux/memcontrol.h	2008-11-11 13:51:42.000000000 +0900
> @@ -27,6 +27,9 @@ struct mm_struct;
> 
>  #ifdef CONFIG_CGROUP_MEM_RES_CTLR
> 
> +extern void __init_mem_page_cgroup(struct page_cgroup *pc);
> +#define  mem_cgroup_disabled() mem_cgroup_subsys.disabled
> +
>  extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,
>  				gfp_t gfp_mask);
>  /* for swap handling */
> @@ -81,6 +84,15 @@ extern long mem_cgroup_calc_reclaim(stru
>  #else /* CONFIG_CGROUP_MEM_RES_CTLR */
>  struct mem_cgroup;
> 
> +static inline void __init_mem_page_cgroup(struct page_cgroup *pc)
> +{
> +}
> +
> +static inline int mem_cgroup_disabled(void)
> +{
> +	return 1;
> +}
> +

With CONFIG_CGROUP_MEM_RES_CTLR not defined, page_cgroup init routines will just
return, is that what bio page_cgroup needs?

-- 
	Balbir
--
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