diff options
| author | Paul Turner <pjt@google.com> | 2011-07-21 18:43:31 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-08-14 12:03:28 +0200 |
| commit | 58088ad0152ba4b7997388c93d0ca208ec1ece75 (patch) | |
| tree | 22d818b745056effc53ee6fa97ee9103548766b5 /kernel/sched_fair.c | |
| parent | sched: Accumulate per-cfs_rq cpu usage and charge against bandwidth (diff) | |
| download | linux-58088ad0152ba4b7997388c93d0ca208ec1ece75.tar.xz linux-58088ad0152ba4b7997388c93d0ca208ec1ece75.zip | |
sched: Add a timer to handle CFS bandwidth refresh
This patch adds a per-task_group timer which handles the refresh of the global
CFS bandwidth pool.
Since the RT pool is using a similar timer there's some small refactoring to
share this support.
Signed-off-by: Paul Turner <pjt@google.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/20110721184757.277271273@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 40 |
1 files changed, 37 insertions, 3 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 9502aa899f73..af73a8a85eef 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1284,9 +1284,16 @@ static void assign_cfs_rq_runtime(struct cfs_rq *cfs_rq) raw_spin_lock(&cfs_b->lock); if (cfs_b->quota == RUNTIME_INF) amount = min_amount; - else if (cfs_b->runtime > 0) { - amount = min(cfs_b->runtime, min_amount); - cfs_b->runtime -= amount; + else { + /* ensure bandwidth timer remains active under consumption */ + if (!cfs_b->timer_active) + __start_cfs_bandwidth(cfs_b); + + if (cfs_b->runtime > 0) { + amount = min(cfs_b->runtime, min_amount); + cfs_b->runtime -= amount; + cfs_b->idle = 0; + } } raw_spin_unlock(&cfs_b->lock); @@ -1315,6 +1322,33 @@ static __always_inline void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, __account_cfs_rq_runtime(cfs_rq, delta_exec); } +/* + * Responsible for refilling a task_group's bandwidth and unthrottling its + * cfs_rqs as appropriate. If there has been no activity within the last + * period the timer is deactivated until scheduling resumes; cfs_b->idle is + * used to track this state. + */ +static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun) +{ + int idle = 1; + + raw_spin_lock(&cfs_b->lock); + /* no need to continue the timer with no bandwidth constraint */ + if (cfs_b->quota == RUNTIME_INF) + goto out_unlock; + + idle = cfs_b->idle; + cfs_b->runtime = cfs_b->quota; + + /* mark as potentially idle for the upcoming period */ + cfs_b->idle = 1; +out_unlock: + if (idle) + cfs_b->timer_active = 0; + raw_spin_unlock(&cfs_b->lock); + + return idle; +} #else static void account_cfs_rq_runtime(struct cfs_rq *cfs_rq, unsigned long delta_exec) {} |