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

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Message-ID: <20110324123858.GA27829@linux.vnet.ibm.com>
Date:	Thu, 24 Mar 2011 18:08:58 +0530
From:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.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>,
	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

* Paul Turner <pjt@...gle.com> [2011-03-22 20:03:27]:

> In this patch we introduce the notion of CFS bandwidth, partitioned into 
> globally unassigned bandwidth, and locally claimed bandwidth.
> 
> - The global bandwidth is per task_group, it represents a pool of unclaimed
>   bandwidth that cfs_rqs can allocate from.  
> - The local bandwidth is tracked per-cfs_rq, this represents allotments from
>   the global pool bandwidth assigned to a specific cpu.
> 
> Bandwidth is managed via cgroupfs, adding two new interfaces to the cpu subsystem:
> - cpu.cfs_period_us : the bandwidth period in usecs
> - cpu.cfs_quota_us : the cpu bandwidth (in usecs) that this tg will be allowed
>   to consume over period above.
> 
> A per-cfs_bandwidth timer is also introduced to handle future refresh at
> period expiration.  There's some minor refactoring here so that
> start_bandwidth_timer() functionality can be shared
> 
> Signed-off-by: Paul Turner <pjt@...gle.com>
> Signed-off-by: Nikhil Rao <ncrao@...gle.com>
> Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
> ---
<snip>

defconfig build on powerpc, with patchset applied on 4bbba111d94 fails

kernel/sched.c: In function 'tg_cfs_bandwidth':
kernel/sched.c:408: error: dereferencing pointer to incomplete type
make[1]: *** [kernel/sched.o] Error 1

CONFIG_CGROUPS=y
CONFIG_CGROUP_SCHED=n
CONFIG_EXPERIMENTAL=y
CONFIG_FAIR_GROUP_SCHED=n
CONFIG_CFS_BANDWIDTH=n

 thanks,
 Kamalesh
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