e79f447a97
It is preferable that WALT window rollover occurs just
before a tick, since the tick is an opportune moment
to record a complete window's statistics, as well as report
those stats to the cpu frequency governor. When CONFIG_HZ
results in a TICK_NSEC that isn't a integral number, this
requirement may be violated. Account for this by reducing
the WALT window size to the nearest multiple of TICK_NSEC.
Commit d368c6faa1 ("sched: walt: fix window misalignment
when HZ=300") attempted to do this but WALT isn't using
MIN_SCHED_RAVG_WINDOW as the window size and the patch was
doing nothing.
Also, change the type of 'walt_disabled' to bool and warn
if an invalid window size causes WALT to be disabled.
Change-Id: Ie3dcfc21a3df4408254ca1165a355bbe391ed5c7
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
64 lines
2.6 KiB
C
64 lines
2.6 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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void walt_account_irqtime(int cpu, struct task_struct *curr, u64 delta,
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u64 wallclock);
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u64 walt_irqload(int cpu);
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int walt_cpu_high_irqload(int cpu);
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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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#define walt_cpu_high_irqload(cpu) false
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#endif /* CONFIG_SCHED_WALT */
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extern bool walt_disabled;
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#endif
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