linux-kernel - Re: [PATCH -tip 1/2] [PATCH -tip 1/2] sched: Reinstate group names in /proc/sched

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Message-ID: <20110111124658.GA4507@zhy>
Date:	Tue, 11 Jan 2011 20:46:58 +0800
From:	Yong Zhang <yong.zhang0@...il.com>
To:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH -tip 1/2] [PATCH -tip 1/2] sched: Reinstate group names
 in /proc/sched_debug.

On Tue, Jan 11, 2011 at 03:41:54PM +0530, Bharata B Rao wrote:
> sched: Reinstate group names in /proc/sched_debug.
> 
> Displaying of group names in /proc/sched_debug was dropped in autogroup
> patches. Add group names while displaying cfs_rq and tasks information.
> 
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> ---
>  kernel/sched_debug.c |   35 +++++++++++++++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> --- a/kernel/sched_debug.c
> +++ b/kernel/sched_debug.c
> @@ -16,6 +16,8 @@
>  #include <linux/kallsyms.h>
>  #include <linux/utsname.h>
>  
> +static DEFINE_SPINLOCK(sched_debug_lock);

I don't get your point on introducing this lock.
Just to avoid concurrent access?
Or could you explain please?

Thanks,
Yong
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