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| author | Paul Turner <pjt@google.com> | 2011-07-21 09:43:30 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-08-14 12:03:26 +0200 |
| commit | ec12cb7f31e28854efae7dd6f9544e0a66379040 (patch) | |
| tree | 30a7293a4f9d566043f524bb4c43d4ae8b0560db /kernel/sched.c | |
| parent | a790de99599a29ad3f18667530cf4b9f4b7e3234 (diff) | |
| download | talos-obmc-linux-ec12cb7f31e28854efae7dd6f9544e0a66379040.tar.gz talos-obmc-linux-ec12cb7f31e28854efae7dd6f9544e0a66379040.zip | |
sched: Accumulate per-cfs_rq cpu usage and charge against bandwidth
Account bandwidth usage on the cfs_rq level versus the task_groups to which
they belong. Whether we are tracking bandwidth on a given cfs_rq is maintained
under cfs_rq->runtime_enabled.
cfs_rq's which belong to a bandwidth constrained task_group have their runtime
accounted via the update_curr() path, which withdraws bandwidth from the global
pool as desired. Updates involving the global pool are currently protected
under cfs_bandwidth->lock, local runtime is protected by rq->lock.
This patch only assigns and tracks quota, no action is taken in the case that
cfs_rq->runtime_used exceeds cfs_rq->runtime_assigned.
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>
Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110721184757.179386821@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index ea6850d93b2a..35561c63a490 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -251,7 +251,7 @@ struct cfs_bandwidth { #ifdef CONFIG_CFS_BANDWIDTH raw_spinlock_t lock; ktime_t period; - u64 quota; + u64 quota, runtime; s64 hierarchal_quota; #endif }; @@ -407,6 +407,7 @@ static inline u64 default_cfs_period(void); static void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) { raw_spin_lock_init(&cfs_b->lock); + cfs_b->runtime = 0; cfs_b->quota = RUNTIME_INF; cfs_b->period = ns_to_ktime(default_cfs_period()); } @@ -9107,6 +9108,7 @@ static int tg_set_cfs_bandwidth(struct task_group *tg, u64 period, u64 quota) raw_spin_lock_irq(&cfs_b->lock); cfs_b->period = ns_to_ktime(period); cfs_b->quota = quota; + cfs_b->runtime = quota; raw_spin_unlock_irq(&cfs_b->lock); for_each_possible_cpu(i) { |
