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authorThomas Gleixner <tglx@linutronix.de>2022-04-15 22:20:02 +0300
committerThomas Gleixner <tglx@linutronix.de>2022-04-27 21:22:19 +0300
commit7d84c1ebf9ddafca27b481e6da7d24a023dacaa2 (patch)
treedfd347ccd2ca0a1513e5715316ffe221b2608c39 /include/linux/cpufreq.h
parentcd8c0e142daf9de9ce594e61b75509b0af7bfb26 (diff)
downloadlinux-7d84c1ebf9ddafca27b481e6da7d24a023dacaa2.tar.xz
x86/aperfmperf: Replace aperfmperf_get_khz()
The frequency invariance infrastructure provides the APERF/MPERF samples already. Utilize them for the cpu frequency display in /proc/cpuinfo. The sample is considered valid for 20ms. So for idle or isolated NOHZ full CPUs the function returns 0, which is matching the previous behaviour. This gets rid of the mass IPIs and a delay of 20ms for stabilizing observed by Eric when reading /proc/cpuinfo. Reported-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lore.kernel.org/r/20220415161206.875029458@linutronix.de
Diffstat (limited to 'include/linux/cpufreq.h')
-rw-r--r--include/linux/cpufreq.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 35c7d6db4139..d5595d57f4e5 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -1199,7 +1199,6 @@ static inline void sched_cpufreq_governor_change(struct cpufreq_policy *policy,
struct cpufreq_governor *old_gov) { }
#endif
-extern void arch_freq_prepare_all(void);
extern unsigned int arch_freq_get_on_cpu(int cpu);
#ifndef arch_set_freq_scale