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

[Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>]

* Paul Turner <pjt@google.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@google.com>
> Signed-off-by: Nikhil Rao <ncrao@google.com>
> Signed-off-by: Bharata B Rao <bharata@linux.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