linux-kernel - Re: [patch 11/15] sched: prevent interactions between throttled entities and load-balance

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Message-ID: <BANLkTi=hDfFMGZfEfOkHAT1ixcYyMcq+xw@mail.gmail.com>
Date:	Wed, 11 May 2011 02:11:42 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.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 11/15] sched: prevent interactions between throttled
 entities and load-balance

On Tue, May 10, 2011 at 12:26 AM, Hidetoshi Seto
<seto.hidetoshi@...fujitsu.com> wrote:
> (2011/05/03 18:28), Paul Turner wrote:
>>>>From the perspective of load-balance and shares distribution, throttled
>> entities should be invisible.
>>
>> However, both of these operations work on 'active' lists and are not
>> inherently aware of what group hierarchies may be present.  In some cases this
>> may be side-stepped (e.g. we could sideload via tg_load_down in load balance)
>> while in others (e.g. update_shares()) it is more difficult to compute without
>> incurring some O(n^2) costs.
>>
>> Instead, track hierarchal throttled state at time of transition.  This allows
>
>                 hierarchical

Fixed, Thanks

>
>> us to easily identify whether an entity belongs to a throttled hierarchy and
>> avoid incorrect interactions with it.
>>
>> Also, when an entity leaves a throttled hierarchy we need to advance its
>> time averaging for shares averaging so that the elapsed throttled time is not
>> considered as part of the cfs_rq's operation.
>>
>> Signed-off-by: Paul Turner <pjt@...gle.com>
>> ---
>
> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
>
> Thanks,
> H.Seto
>
>
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