linux-kernel - Re: [patch 04/16] sched: validate CFS quota hierarchies

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Date:	Wed, 22 Jun 2011 11:13:40 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [patch 04/16] sched: validate CFS quota hierarchies

On Tue, Jun 21, 2011 at 12:16:53AM -0700, Paul Turner wrote:
> Add constraints validation for CFS bandwidth hierarchies.
> 
> Validate that:
>    max(child bandwidth) <= parent_bandwidth
> 
> In a quota limited hierarchy, an unconstrained entity
> (e.g. bandwidth==RUNTIME_INF) inherits the bandwidth of its parent.
> 
> This constraint is chosen over sum(child_bandwidth) as notion of over-commit is
> valuable within SCHED_OTHER.  Some basic code from the RT case is re-factored
> for reuse.
> 
> Signed-off-by: Paul Turner <pjt@...gle.com>
> 
> ---
>  kernel/sched.c |  109 ++++++++++++++++++++++++++++++++++++++++++++++++++-------
>  1 file changed, 96 insertions(+), 13 deletions(-)
> 
> Index: tip/kernel/sched.c
> ===================================================================
> --- tip.orig/kernel/sched.c
> +++ tip/kernel/sched.c
> @@ -249,6 +249,7 @@ struct cfs_bandwidth {
>  	raw_spinlock_t lock;
>  	ktime_t period;
>  	u64 quota;
> +	s64 hierarchal_quota;

You mean hierarchical I suppose.

Regards,
Bharata.
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