Messages in this thread Patch in this message | | | From | Beata Michalska <> | Subject | [PATCH v4 4/4] cpufreq: Use arch specific feedback for cpuinfo_cur_freq | Date | Fri, 5 Apr 2024 14:33:19 +0100 |
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Some architectures provide a way to determine an average frequency over a certain period of time based on available performance monitors (AMU on ARM or APERF/MPERf on x86). With those at hand, enroll arch_freq_get_on_cpu into cpuinfo_cur_freq policy sysfs attribute handler, which is expected to represent the current frequency of a given CPU, as obtained by the hardware. This is the type of feedback that counters do provide.
Signed-off-by: Beata Michalska <beata.michalska@arm.com> --- drivers/cpufreq/cpufreq.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 66e10a19d76a..603533b2608f 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -795,8 +795,10 @@ store_one(scaling_max_freq, max); static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy, char *buf) { - unsigned int cur_freq = __cpufreq_get(policy); + unsigned int cur_freq = arch_freq_get_on_cpu(policy->cpu); + if (!cur_freq) + cur_freq = __cpufreq_get(policy); if (cur_freq) return sprintf(buf, "%u\n", cur_freq); -- 2.25.1
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