linux-kernel - Re: [patch 13/15] sched: add exports tracking cfs bandwidth control statistics

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Message-ID: <4DC8E8EF.8030109@jp.fujitsu.com>
Date:	Tue, 10 May 2011 16:27:43 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Paul Turner <pjt@...gle.com>
CC:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Nikhil Rao <ncrao@...gle.com>
Subject: Re: [patch 13/15] sched: add exports tracking cfs bandwidth control
 statistics

(2011/05/03 18:28), Paul Turner wrote:
> From: Nikhil Rao <ncrao@...gle.com>
> 
> This change introduces statistics exports for the cpu sub-system, these are
> added through the use of a stat file similar to that exported by other
> subsystems.
> 
> The following exports are included:
> 
> nr_periods:	number of periods in which execution occurred
> nr_throttled:	the number of periods above in which execution was throttle
> throttled_time:	cumulative wall-time that any cpus have been throttled for
> this group
> 
> Signed-off-by: Nikhil Rao <ncrao@...gle.com>
> Signed-off-by: Paul Turner <pjt@...gle.com>
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> ---
>  kernel/sched.c      |   22 ++++++++++++++++++++++
>  kernel/sched_fair.c |    9 +++++++++
>  2 files changed, 31 insertions(+)
> 
> Index: tip/kernel/sched.c
> ===================================================================
> --- tip.orig/kernel/sched.c
> +++ tip/kernel/sched.c
> @@ -260,6 +260,10 @@ struct cfs_bandwidth {
>  	struct hrtimer period_timer;
>  	struct list_head throttled_cfs_rq;
>  
> +	/* statistics */
> +	int nr_periods, nr_throttled;
> +	u64 throttled_time;
> +
>  #endif
>  };
>  

Nit: blank line?

Reviewed-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>

Thanks,
H.Seto

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