linux-kernel - Re: [patch 01/15] sched: introduce primitives to account for CFS bandwidth tracking

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Message-ID: <1302010103.2225.1336.camel@twins>
Date:	Tue, 05 Apr 2011 15:28:23 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	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 01/15] sched: introduce primitives to account for CFS
 bandwidth tracking

On Tue, 2011-03-22 at 20:03 -0700, Paul Turner wrote:
> +const u64 max_cfs_quota_period = 5 * NSEC_PER_SEC; /* 5s */

I would prefer that max to be _much_ lower than that, 5 seconds is a
long time to be throttled while holding a lock the rest of the system
wants.


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