From 47fe38fcff0517e67d395c039d2e26d2de688a60 Mon Sep 17 00:00:00 2001 From: Peter Zijlstra Date: Wed, 2 Sep 2009 13:49:18 +0200 Subject: x86: sched: Provide arch implementations using aperf/mperf APERF/MPERF support for cpu_power. APERF/MPERF is arch defined to be a relative scale of work capacity per logical cpu, this is assumed to include SMT and Turbo mode. APERF/MPERF are specified to both reset to 0 when either counter wraps, which is highly inconvenient, since that'll give a blimp when that happens. The manual specifies writing 0 to the counters after each read, but that's 1) too expensive, and 2) destroys the possibility of sharing these counters with other users, so we live with the blimp - the other existing user does too. Signed-off-by: Peter Zijlstra LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/sched.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/sched.h') diff --git a/include/linux/sched.h b/include/linux/sched.h index c30bf3d516d..fc4c0f9393d 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -992,6 +992,9 @@ static inline int test_sd_parent(struct sched_domain *sd, int flag) return 0; } +unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); +unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); + #else /* CONFIG_SMP */ struct sched_domain_attr; @@ -1003,6 +1006,7 @@ partition_sched_domains(int ndoms_new, struct cpumask *doms_new, } #endif /* !CONFIG_SMP */ + struct io_context; /* See blkdev.h */ -- cgit v1.2.3