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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-02 13:49:18 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-15 16:51:27 +0200 |
| commit | 47fe38fcff0517e67d395c039d2e26d2de688a60 (patch) | |
| tree | ada38f4e1aa644354b9de4c2cb128719e9e64a9e /include/linux/sched.h | |
| parent | 5cbc19a983141729d716be17197028434127b376 (diff) | |
| download | lwn-47fe38fcff0517e67d395c039d2e26d2de688a60.tar.gz lwn-47fe38fcff0517e67d395c039d2e26d2de688a60.zip | |
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 <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index c30bf3d516d1..fc4c0f9393d2 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 */ |