From 95235ca2c20ac0b31a8eb39e2d599bcc3e9c9a10 Mon Sep 17 00:00:00 2001 From: Venkatesh Pallipadi Date: Fri, 2 Dec 2005 10:43:20 -0800 Subject: [CPUFREQ] CPU frequency display in /proc/cpuinfo What is the value shown in "cpu MHz" of /proc/cpuinfo when CPUs are capable of changing frequency? Today the answer is: It depends. On i386: SMP kernel - It is always the boot frequency UP kernel - Scales with the frequency change and shows that was last set. On x86_64: There is one single variable cpu_khz that gets written by all the CPUs. So, the frequency set by last CPU will be seen on /proc/cpuinfo of all the CPUs in the system. What you see also depends on whether you have constant_tsc capable CPU or not. On ia64: It is always boot time frequency of a particular CPU that gets displayed. The patch below changes this to: Show the last known frequency of the particular CPU, when cpufreq is present. If cpu doesnot support changing of frequency through cpufreq, then boot frequency will be shown. The patch affects i386, x86_64 and ia64 architectures. Signed-off-by: Venkatesh Pallipadi Signed-off-by: Dave Jones --- drivers/cpufreq/cpufreq.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'drivers') diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 815902c2c856..a9163d02983a 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -822,6 +822,30 @@ static void cpufreq_out_of_sync(unsigned int cpu, unsigned int old_freq, unsigne } +/** + * cpufreq_quick_get - get the CPU frequency (in kHz) frpm policy->cur + * @cpu: CPU number + * + * This is the last known freq, without actually getting it from the driver. + * Return value will be same as what is shown in scaling_cur_freq in sysfs. + */ +unsigned int cpufreq_quick_get(unsigned int cpu) +{ + struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); + unsigned int ret = 0; + + if (policy) { + down(&policy->lock); + ret = policy->cur; + up(&policy->lock); + cpufreq_cpu_put(policy); + } + + return (ret); +} +EXPORT_SYMBOL(cpufreq_quick_get); + + /** * cpufreq_get - get the current CPU frequency (in kHz) * @cpu: CPU number -- cgit v1.2.2