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

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Message-ID: <4E01B7FE.8030300@jp.fujitsu.com>
Date:	Wed, 22 Jun 2011 18:38:06 +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>
Subject: Re: [patch 04/16] sched: validate CFS quota hierarchies

(2011/06/21 16:16), 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>
> 
> ---

The sysctl_sched_cfs_bandwidth_consistent is gone for good.
Now it is no longer complicated.

(Though there is a trivial typo pointed by Bharata, soon it will be fixed.)
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>


Thanks,
H.Seto

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