Patrick Bellasi
56e2719627
The find_best_target() code has evolved over time to integrate different micro-optimizations to the point to be quite difficult now to follow exactly what it's doing. This patch rafactors the existing code to make it more readable and easy to maintain. It does that by properly identifying the three main use-cases and addressing them in priority order: A) latency sensitive tasks B) non latency sensitive tasks on IDLE CPUs C) non latency sensitive tasks on ACTIVE CPUs The original behaviors are preserved. Some tests to compare power/performances before and after this patch have been done using Jankbench and YouTube and we did not noticed sensible differences. The only difference with respect of the original code is a small update to favor lower-capacity idle CPUs in case B. The same preference is not enforce in case A since this can lead to a selection of a non-reserved CPU for TOP_APP tasks, which ultimately can lead to non desirable co-scheduling side-effects. Change-Id: I871e5d95af89176217e4e239b64d44a420baabe8 Signed-off-by: Patrick Bellasi <patrick.bellasi@arm.com> (removed checkpatch whitespace error) Signed-off-by: Chris Redpath <chris.redpath@arm.com> [Fixed cherry-pick issue] (cherry picked from commit 6b0008b7d7be7d141f9855337eb09ad0c9217cfb) Signed-off-by: Quentin Perret <quentin.perret@arm.com>
65 lines
2.6 KiB
C
65 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 unsigned int walt_disabled;
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#endif
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