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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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a7fe5190c0
The function get_loadavg() returns almost always zero. To be more
precise, statistically speaking for a total of 1023379 times passing
in the function, the load is equal to zero 1020728 times, greater than
100, 610 times, the remaining is between 0 and 5.
In 2011, the get_loadavg() was removed from the Android tree because
of the above [1]. At this time, the load was:
unsigned long this_cpu_load(void)
{
struct rq *this = this_rq();
return this->cpu_load[0];
}
In 2014, the code was changed by commit 372ba8cb46 (cpuidle: menu: Lookup CPU
runqueues less) and the load is:
void get_iowait_load(unsigned long *nr_waiters, unsigned long *load)
{
struct rq *rq = this_rq();
*nr_waiters = atomic_read(&rq->nr_iowait);
*load = rq->load.weight;
}
with the same result.
Both measurements show using the load in this code path does no matter
anymore. Removing it.
[1] 4dedd9f124
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
41 lines
969 B
C
41 lines
969 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_STAT_H
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#define _LINUX_SCHED_STAT_H
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#include <linux/percpu.h>
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/*
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* Various counters maintained by the scheduler and fork(),
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* exposed via /proc, sys.c or used by drivers via these APIs.
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*
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* ( Note that all these values are aquired without locking,
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* so they can only be relied on in narrow circumstances. )
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*/
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extern unsigned long total_forks;
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extern int nr_threads;
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DECLARE_PER_CPU(unsigned long, process_counts);
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extern int nr_processes(void);
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extern unsigned long nr_running(void);
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extern bool single_task_running(void);
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extern unsigned long nr_iowait(void);
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extern unsigned long nr_iowait_cpu(int cpu);
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static inline int sched_info_on(void)
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{
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#ifdef CONFIG_SCHEDSTATS
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return 1;
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#elif defined(CONFIG_TASK_DELAY_ACCT)
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extern int delayacct_on;
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return delayacct_on;
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#else
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return 0;
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#endif
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}
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#ifdef CONFIG_SCHEDSTATS
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void force_schedstat_enabled(void);
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#endif
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#endif /* _LINUX_SCHED_STAT_H */
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