9377277724
The new sysctl sched_pelt_multiplier allows a user to set a clock multiplier x2 or x4 (x1 being the default). This clock multiplier artificially speed-up PELT ramp up/down similarly to a faster half-life. Indeed, if we write PELT as a first order filter: y(t) = G * (1 - exp(t/tau)) Then we can see that multiplying the time by a constant X, is the same as dividing the time constant tau by X. y(t) = G * (1 - exp((t*X)/tau)) y(t) = G * (1 - exp(t/(tau/X))) Tau being half-life*ln(2), multiplying the PELT time is the same as dividing the half-life: - x1: 32ms half-life - x2: 16ms half-life - x4: 8ms half-life Internally, a new clock is created: rq->clock_task_mult. It sits in the clock hierarchy between rq->clock_task and rq->clock_pelt. Bug: 177593580 Bug: 237219700 Change-Id: I67e6ca7994bebea22bf75732ee11d2b10e0d6b7e Suggested-by: Morten Rasmussen <morten.rasmussen@arm.com> Signed-off-by: Vincent Donnefort <vincent.donnefort@arm.com> Signed-off-by: JianMin Liu <jian-min.liu@mediatek.com>
109 lines
3.3 KiB
C
109 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_SYSCTL_H
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#define _LINUX_SCHED_SYSCTL_H
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#include <linux/types.h>
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struct ctl_table;
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#ifdef CONFIG_DETECT_HUNG_TASK
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#ifdef CONFIG_SMP
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extern unsigned int sysctl_hung_task_all_cpu_backtrace;
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#else
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#define sysctl_hung_task_all_cpu_backtrace 0
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#endif /* CONFIG_SMP */
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extern int sysctl_hung_task_check_count;
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extern unsigned int sysctl_hung_task_panic;
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extern unsigned long sysctl_hung_task_timeout_secs;
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extern unsigned long sysctl_hung_task_check_interval_secs;
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extern int sysctl_hung_task_warnings;
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int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos);
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#else
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/* Avoid need for ifdefs elsewhere in the code */
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enum { sysctl_hung_task_timeout_secs = 0 };
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#endif
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extern unsigned int sysctl_sched_latency;
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extern unsigned int sysctl_sched_min_granularity;
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extern unsigned int sysctl_sched_wakeup_granularity;
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extern unsigned int sysctl_sched_child_runs_first;
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enum sched_tunable_scaling {
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SCHED_TUNABLESCALING_NONE,
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SCHED_TUNABLESCALING_LOG,
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SCHED_TUNABLESCALING_LINEAR,
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SCHED_TUNABLESCALING_END,
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};
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extern enum sched_tunable_scaling sysctl_sched_tunable_scaling;
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extern unsigned int sysctl_numa_balancing_scan_delay;
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extern unsigned int sysctl_numa_balancing_scan_period_min;
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extern unsigned int sysctl_numa_balancing_scan_period_max;
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extern unsigned int sysctl_numa_balancing_scan_size;
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#ifdef CONFIG_SCHED_DEBUG
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extern __read_mostly unsigned int sysctl_sched_migration_cost;
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extern __read_mostly unsigned int sysctl_sched_nr_migrate;
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int sched_proc_update_handler(struct ctl_table *table, int write,
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void *buffer, size_t *length, loff_t *ppos);
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#endif
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/*
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* control realtime throttling:
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*
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* /proc/sys/kernel/sched_rt_period_us
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* /proc/sys/kernel/sched_rt_runtime_us
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*/
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extern unsigned int sysctl_sched_rt_period;
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extern int sysctl_sched_rt_runtime;
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extern unsigned int sysctl_sched_dl_period_max;
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extern unsigned int sysctl_sched_dl_period_min;
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#ifdef CONFIG_UCLAMP_TASK
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extern unsigned int sysctl_sched_uclamp_util_min;
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extern unsigned int sysctl_sched_uclamp_util_max;
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extern unsigned int sysctl_sched_uclamp_util_min_rt_default;
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#endif
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#ifdef CONFIG_CFS_BANDWIDTH
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extern unsigned int sysctl_sched_cfs_bandwidth_slice;
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#endif
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#ifdef CONFIG_SCHED_AUTOGROUP
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extern unsigned int sysctl_sched_autogroup_enabled;
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#endif
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extern int sysctl_sched_rr_timeslice;
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extern int sched_rr_timeslice;
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int sched_rr_handler(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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int sched_rt_handler(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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int sysctl_sched_uclamp_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos);
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int sysctl_numa_balancing(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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int sysctl_schedstats(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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#ifdef CONFIG_SMP
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extern unsigned int sysctl_sched_pelt_multiplier;
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int sched_pelt_multiplier(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos);
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#endif
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#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
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extern unsigned int sysctl_sched_energy_aware;
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int sched_energy_aware_handler(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos);
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#endif
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#endif /* _LINUX_SCHED_SYSCTL_H */
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