linux_old1/tools/power/cpupower
Prarit Bhargava 16b7c275c0 tools: cpupower: fix return checks for sysfs_get_idlestate_count()
Red Hat and Fedora use a bug reporting tool that gathers data about
"broken" systems called sosreport.  Among other things, it includes the
output of 'cpupower idle-info'.  Executing 'cpupower idle-info' on a
system that has cpuidle disabled via 'cpuidle.off=1' results in a 300
second hang in the cpupower application.

ie)
[root@intel-brickland-05]# cpupower idle-info
Could not determine cpuidle driver

Analyzing CPU 0:
Number of idle states: -19
[hang]

The problem is that the cpupower code only checks for a zero return from
sysfs_get_idlestate_count().  The function can return -ENODEV (-19) as
above.  This patch fixes callers to sysfs_get_idlestate_count() to check
the right return values.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2014-12-05 03:12:34 +01:00
..
bench cpupower: bench: parse.c: Fix several minor errors 2014-07-30 01:57:13 +02:00
debug cpufreq: Make linux-pm@vger.kernel.org official mailing list 2014-05-01 01:15:32 +02:00
lib cpupowerutils: increase MAX_LINE_LEN 2011-07-29 18:35:40 +02:00
man cpupower: Remove mc and smt power aware scheduler info/settings 2014-05-17 00:36:37 +02:00
po cpupowerutils - cpufrequtils extended with quite some features 2011-07-29 18:35:36 +02:00
utils tools: cpupower: fix return checks for sysfs_get_idlestate_count() 2014-12-05 03:12:34 +01:00
.gitignore cpupower tools: Update .gitignore for files created in the debug directories 2012-11-27 23:07:18 +01:00
Makefile Merge branches 'acpi-tools' and 'pm-tools' 2014-06-03 23:13:34 +02:00
README cpupower: Remove dead link to homepage, and update the targets built. 2014-05-17 00:36:36 +02:00
ToDo cpupower: Remove dead link to homepage, and update the targets built. 2014-05-17 00:36:36 +02:00

README

The cpupower package consists of the following elements:

requirements
------------

On x86 pciutils is needed at runtime (-lpci).
For compilation pciutils-devel (pci/pci.h) and a gcc version
providing cpuid.h is needed.
For both it's not explicitly checked for (yet).


libcpupower
----------

"libcpupower" is a library which offers a unified access method for userspace
tools and programs to the cpufreq core and drivers in the Linux kernel. This
allows for code reduction in userspace tools, a clean implementation of
the interaction to the cpufreq core, and support for both the sysfs and proc
interfaces [depending on configuration, see below].


compilation and installation
----------------------------

make
su
make install

should suffice on most systems. It builds libcpupower to put in
/usr/lib; cpupower, cpufreq-bench_plot.sh to put in /usr/bin; and
cpufreq-bench to put in /usr/sbin. If you want to set up the paths
differently and/or want to configure the package to your specific
needs, you need to open "Makefile" with an editor of your choice and
edit the block marked CONFIGURATION.


THANKS
------
Many thanks to Mattia Dongili who wrote the autotoolization and
libtoolization, the manpages and the italian language file for cpupower;
to Dave Jones for his feedback and his dump_psb tool; to Bruno Ducrot for his
powernow-k8-decode and intel_gsic tools as well as the french language file;
and to various others commenting on the previous (pre-)releases of 
cpupower.


        Dominik Brodowski