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

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Date:	Tue, 21 Jun 2011 23:57:42 -0700
From:	Paul Turner <pjt@...gle.com>
To:	bharata@...ux.vnet.ibm.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 10:43 PM, Bharata B Rao
<bharata@...ux.vnet.ibm.com> wrote:
> 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.
>

Yup!  Thanks

> Regards,
> Bharata.
>
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