[PATCH 1/4] cpupower: Add cpupower-idle-info manpage
trenn at suse.de
Fri Dec 16 09:35:51 EST 2011
The last missing manpage for cpupower tools.
More info about other architecture's sleep state specialities would be great.
Signed-off-by: Thomas Renninger <trenn at suse.de>
CC: linux-arm-kernel at lists.infradead.org
CC: jean.pihet at newoldbits.com
CC: linux-omap at vger.kernel.org
CC: linux-pm at lists.linux-foundation.org
CC: linux-acpi at vger.kernel.org
CC: cpufreq at vger.kernel.org
CC: linux at dominikbrodowski.net
tools/power/cpupower/man/cpupower-idle-info.1 | 90 +++++++++++++++++++++++++
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create mode 100644 tools/power/cpupower/man/cpupower-idle-info.1
diff --git a/tools/power/cpupower/man/cpupower-idle-info.1 b/tools/power/cpupower/man/cpupower-idle-info.1
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+.TH "CPUPOWER-IDLE-INFO" "1" "0.1" "" "cpupower Manual"
+cpupower idle\-info \- Utility to retrieve cpu idle kernel information
+cpupower [ \-c cpulist ] idle\-info [\fIoptions\fP]
+A tool which prints out per cpu idle information helpful to developers and interested users.
+Only print a summary of all available C-states in the system.
+Prints out idle information in old /proc/acpi/processor/*/power format. This
+interface has been removed from the kernel for quite some time, do not let
+further code depend on this option, best do not use it.
+.SH IDLE\-INFO DESCRIPTIONS
+CPU sleep state statistics and descriptions are retrieved from sysfs files,
+exported by the cpuidle kernel subsystem. The kernel only updates these
+statistics when it enters or leaves an idle state, therefore on a very idle or
+a very busy system, these statistics may not be accurate. They still provide a
+good overview about the usage and availability of processor sleep states on
+Be aware that the sleep states as exported by the hardware or BIOS and used by
+the Linux kernel may not exactly reflect the capabilities of the
+processor. This often is the case on the X86 architecture when the acpi_idle
+driver is used. It is also possible that the hardware overrules the kernel
+requests, due to internal activity monitors or other reasons.
+On recent X86 platforms it is often possible to read out hardware registers
+which monitor the duration of sleep states the processor resided in. The
+cpupower monitor tool (cpupower\-monitor(1)) can be used to show real sleep
+state residencies. Please refer to the architecture specific description
+.SH IDLE\-INFO ARCHITECTURE SPECIFIC DESCRIPTIONS
+POLL idle state
+If cpuidle is active, X86 platforms have one special idle state.
+The POLL idle state is not a real idle state, it does not save any
+power. Instead, a busy\-loop is executed doing nothing for a short period of
+time. This state is used if the kernel knows that work has to be processed
+very soon and entering any real hardware idle state may result in a slight
+There exist two different cpuidle drivers on the X86 architecture platform:
+"acpi_idle" cpuidle driver
+The acpi_idle cpuidle driver retrieves available sleep states (C\-states) from
+the ACPI BIOS tables (from the _CST ACPI function on recent platforms or from
+the FADT BIOS table on older ones).
+The C1 state is not retrieved from ACPI tables. If the C1 state is entered,
+the kernel will call the hlt instruction (or mwait on Intel).
+"intel_idle" cpuidle driver
+In kernel 2.6.36 the intel_idle driver was introduced.
+It only serves recent Intel CPUs (Nehalem, Westmere, Sandybridge, Atoms or
+newer). On older Intel CPUs the acpi_idle driver is still used (if the BIOS
+provides C\-state ACPI tables).
+The intel_idle driver knows the sleep state capabilities of the processor and
+ignores ACPI BIOS exported processor sleep states tables.
+By default only values of core zero are displayed. How to display settings of
+other cores is described in the cpupower(1) manpage in the \-\-cpu option
+Thomas Renninger <trenn at suse.de>
+.SH "SEE ALSO"
+cpupower(1), cpupower\-monitor(1), cpupower\-info(1), cpupower\-set(1)
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