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

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Message-ID: <20110111140005.GA6069@zhy>
Date:	Tue, 11 Jan 2011 22:00:05 +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 07:12:44PM +0530, Bharata B Rao wrote:
> The group name is generated in a global buffer which is protected by
> this lock. Earlier small sized local buffer (on stack) was used for
> this purpose which wasn't ideal. Also since we can be here from
> interrupt context, I wanted to avoid allocation too. Hence went for
> a global buffer protected by a lock.

Sounds good ;)

BTW, I guess we can also remove rcu_read_lock/unlock() in print_rt_stats()
and print_cfs_stats() with sched_debug_lock hold.

Thanks,
Yong
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