diff options
| author | Srivatsa Vaddagiri <vatsa@codeaurora.org> | 2016-05-31 09:08:38 -0700 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2016-09-14 15:02:22 +0530 |
| commit | b41fa2aec51a031e8b53486966e885116c314579 (patch) | |
| tree | 65c4934a1d1ce05368dd04bba81498fac042154d /include/linux/sched/sysctl.h | |
| parent | 3a7e62318271ddee0ba042becec9e2312ecd4927 (diff) | |
sched: Introduce Window Assisted Load Tracking (WALT)
use a window based view of time in order to track task
demand and CPU utilization in the scheduler.
Window Assisted Load Tracking (WALT) implementation credits:
Srivatsa Vaddagiri, Steve Muckle, Syed Rameez Mustafa, Joonwoo Park,
Pavan Kumar Kondeti, Olav Haugan
2016-03-06: Integration with EAS/refactoring by Vikram Mulukutla
and Todd Kjos
Change-Id: I21408236836625d4e7d7de1843d20ed5ff36c708
Includes fixes for issues:
eas/walt: Use walt_ktime_clock() instead of ktime_get_ns() to avoid a
race resulting in watchdog resets
BUG: 29353986
Change-Id: Ic1820e22a136f7c7ebd6f42e15f14d470f6bbbdb
Handle walt accounting anomoly during resume
During resume, there is a corner case where on wakeup, a task's
prev_runnable_sum can go negative. This is a workaround that
fixes the condition and warns (instead of crashing).
BUG: 29464099
Change-Id: I173e7874324b31a3584435530281708145773508
Signed-off-by: Todd Kjos <tkjos@google.com>
Signed-off-by: Srinath Sridharan <srinathsr@google.com>
Signed-off-by: Juri Lelli <juri.lelli@arm.com>
[jstultz: fwdported to 4.4]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include/linux/sched/sysctl.h')
| -rw-r--r-- | include/linux/sched/sysctl.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 2834841c507e..710f58a28d63 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -43,6 +43,11 @@ extern unsigned int sysctl_sched_is_big_little; extern unsigned int sysctl_sched_sync_hint_enable; extern unsigned int sysctl_sched_initial_task_util; extern unsigned int sysctl_sched_cstate_aware; +#ifdef CONFIG_SCHED_WALT +extern unsigned int sysctl_sched_use_walt_cpu_util; +extern unsigned int sysctl_sched_use_walt_task_util; +extern unsigned int sysctl_sched_walt_init_task_load_pct; +#endif enum sched_tunable_scaling { SCHED_TUNABLESCALING_NONE, |