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 --- arch/i386/kernel/cpu/proc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'arch/i386') diff --git a/arch/i386/kernel/cpu/proc.c b/arch/i386/kernel/cpu/proc.c index e792131..6d91b27 100644 --- a/arch/i386/kernel/cpu/proc.c +++ b/arch/i386/kernel/cpu/proc.c @@ -3,6 +3,7 @@ #include #include #include +#include /* * Get CPU information for use by the procfs. @@ -86,8 +87,11 @@ static int show_cpuinfo(struct seq_file *m, void *v) seq_printf(m, "stepping\t: unknown\n"); if ( cpu_has(c, X86_FEATURE_TSC) ) { + unsigned int freq = cpufreq_quick_get(n); + if (!freq) + freq = cpu_khz; seq_printf(m, "cpu MHz\t\t: %u.%03u\n", - cpu_khz / 1000, (cpu_khz % 1000)); + freq / 1000, (freq % 1000)); } /* Cache size */ -- cgit v1.1