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ANDROID: schedutil: add vendor hook for adjusting util to freq calculation

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Currently, the frequency is calculated by max freq * 1.25 * util / max cap.
Add a vendor hook to adjust the frequency when the calculation
overestimate.

android_vh_map_util_freq
	adjust util to freq calculation

Bug: 177845438

Signed-off-by: Yun Hsiang <yun.hsiang@mediatek.com>
Change-Id: I9aa9079f00af7d3380b19f2fe21b75cddd107d15
This commit is contained in:
Yun Hsiang 2021-01-13 17:00:22 +08:00 • committed by Todd Kjos
commit 68ecddcda8
3 changed files with 13 additions and 1 deletions
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1
drivers/android/vendor_hooks.c
View file

@ -67,3 +67,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_show_regs);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_wq_lockup_pool);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_sysrq_crash);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_find_busiest_group);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_map_util_freq);

5
include/trace/hooks/sched.h
View file

@ -70,6 +70,11 @@ DECLARE_RESTRICTED_HOOK(android_rvh_find_busiest_group,
TP_PROTO(struct sched_group *busiest, struct rq *dst_rq, int *out_balance),
TP_ARGS(busiest, dst_rq, out_balance), 1);
DECLARE_HOOK(android_vh_map_util_freq,
TP_PROTO(unsigned long util, unsigned long freq,
unsigned long cap, unsigned long *next_freq),
TP_ARGS(util, freq, cap, next_freq));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_SCHED_H */

8
kernel/sched/cpufreq_schedutil.c
View file

@ -12,6 +12,7 @@
#include <linux/sched/cpufreq.h>
#include <trace/events/power.h>
#include <trace/hooks/sched.h>
#define IOWAIT_BOOST_MIN (SCHED_CAPACITY_SCALE / 8)
@ -172,8 +173,13 @@ static unsigned int get_next_freq(struct sugov_policy *sg_policy,
struct cpufreq_policy *policy = sg_policy->policy;
unsigned int freq = arch_scale_freq_invariant() ?
policy->cpuinfo.max_freq : policy->cur;
unsigned long next_freq = 0;
freq = map_util_freq(util, freq, max);
trace_android_vh_map_util_freq(util, freq, max, &next_freq);
if (next_freq)
freq = next_freq;
else
freq = map_util_freq(util, freq, max);
if (freq == sg_policy->cached_raw_freq && !sg_policy->need_freq_update)
return sg_policy->next_freq;