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[CPUFREQ] expose cpufreq coordination requirements regardless of coordination mechanism

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Currently, affected_cpus shows which CPUs need to have their frequency
coordinated in software.  When hardware coordination is in use, the contents
of this file appear the same as when no coordination is required.  This can
lead to some confusion among user-space programs, for example, that do not
know that extra coordination is required to force a CPU core to a particular
speed to control power consumption.

To fix this, create a "related_cpus" attribute that always displays the
coordination map regardless of whatever coordination strategy the cpufreq
driver uses (sw or hw).  If the cpufreq driver does not provide a value, fall
back to policy->cpus.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Jones <davej@redhat.com>
This commit is contained in:
Darrick J. Wong
2008-04-18 13:31:12 -07:00
committed by Dave Jones
parent e56a727b02
commit e8628dd06d
3 changed files with 27 additions and 6 deletions
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arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
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@ -601,6 +601,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
policy->shared_type == CPUFREQ_SHARED_TYPE_ANY) {
policy->cpus = perf->shared_cpu_map;
}
policy->related_cpus = perf->shared_cpu_map;
#ifdef CONFIG_SMP
dmi_check_system(sw_any_bug_dmi_table);