linux-kernel - Re: [0/1] [patch -mm] Add containerstats (v3)

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Message-ID: <466A15FB.7010608@linux.vnet.ibm.com>
Date:	Sat, 09 Jun 2007 08:22:43 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux Containers <containers@...ts.osdl.org>,
	Paul Menage <menage@...gle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [0/1] [patch -mm] Add containerstats (v3)

Andrew Morton wrote:
> On Fri, 08 Jun 2007 23:43:46 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> 
>> This patch implements per container statistics infrastructure and re-uses
>> code from the taskstats interface.
> 
> boggle.
> 
> Symbol: CONTAINERS [=y]
>   Selected by: CONTAINER_DEBUG || CPUSETS && SMP || CONTAINER_CPUACCT
> 
> Paul, that's just bizarre.  How come it was done this way?
> 
> <struggles for a while, works out how to make CONFIG_CONTAINERS go away>
> 
> OK, so taskstats.c still compiles, but I'm surprised.  Shouldn't all that
> newly-added container stuff in taskstats.c be inside CONFIG_CONTAINERS?

Hi, Andrew,

I've added a definition of containerstats_build() even when CONFIG_CONTAINERS
is turned off, it simply returns -EINVAL. That's why taskstats.c compiles,
I could add an #ifdef and move the containers commands under CONFIG_CONTAINERS,
but I felt taskstats.c could be clean without any #ifdef's hanging around
(as much as possible).

In the next iteration, I could move out all the code to containerstats.c
and make containerstats.c depend on CONFIG_CONTAINERS

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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