b41fa2aec5
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>
57 lines
2.4 KiB
C
57 lines
2.4 KiB
C
/*
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* Copyright (c) 2016, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __WALT_H
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#define __WALT_H
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#ifdef CONFIG_SCHED_WALT
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void walt_update_task_ravg(struct task_struct *p, struct rq *rq, int event,
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u64 wallclock, u64 irqtime);
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void walt_inc_cumulative_runnable_avg(struct rq *rq, struct task_struct *p);
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void walt_dec_cumulative_runnable_avg(struct rq *rq, struct task_struct *p);
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void walt_inc_cfs_cumulative_runnable_avg(struct cfs_rq *rq,
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struct task_struct *p);
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void walt_dec_cfs_cumulative_runnable_avg(struct cfs_rq *rq,
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struct task_struct *p);
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void walt_fixup_busy_time(struct task_struct *p, int new_cpu);
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void walt_init_new_task_load(struct task_struct *p);
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void walt_mark_task_starting(struct task_struct *p);
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void walt_set_window_start(struct rq *rq);
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void walt_migrate_sync_cpu(int cpu);
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void walt_init_cpu_efficiency(void);
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u64 walt_ktime_clock(void);
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#else /* CONFIG_SCHED_WALT */
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static inline void walt_update_task_ravg(struct task_struct *p, struct rq *rq,
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int event, u64 wallclock, u64 irqtime) { }
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static inline void walt_inc_cumulative_runnable_avg(struct rq *rq, struct task_struct *p) { }
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static inline void walt_dec_cumulative_runnable_avg(struct rq *rq, struct task_struct *p) { }
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static inline void walt_inc_cfs_cumulative_runnable_avg(struct cfs_rq *rq,
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struct task_struct *p) { }
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static inline void walt_dec_cfs_cumulative_runnable_avg(struct cfs_rq *rq,
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struct task_struct *p) { }
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static inline void walt_fixup_busy_time(struct task_struct *p, int new_cpu) { }
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static inline void walt_init_new_task_load(struct task_struct *p) { }
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static inline void walt_mark_task_starting(struct task_struct *p) { }
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static inline void walt_set_window_start(struct rq *rq) { }
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static inline void walt_migrate_sync_cpu(int cpu) { }
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static inline void walt_init_cpu_efficiency(void) { }
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static inline u64 walt_ktime_clock(void) { return 0; }
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#endif /* CONFIG_SCHED_WALT */
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extern unsigned int walt_disabled;
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#endif
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