March 2013 - PowerTOP

Seg Fault due to function format_watts in file src/lib.cpp

by Ganapati Bhat

Dear All, I was compiling powertop as an Android external module and using the option powertop --html. However, there used to be a segmentation fault. When i looked into it, I observed that in the function format_watts in src/lib.cpp, the last argument to mbstows was zero. By changing the argument to len, which is itself an argument to the function format_watts, powertop worked properly? Does this also happen on an x86 machine? ( I am unable to verify this due to some problems in my laptop which I have not yet resolved.) If not then can someone explain to me why is it happening in the case of android? Thanks and Regards, Ganapati

8 years, 6 months

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[Announce] PowerTOP v2.3 release

by Kristen Carlson Accardi

We are pleased to announce the release of PowerTOP v2.3. This is a maintenance release. About PowerTOP PowerTOP is a Linux tool used to diagnose issues with power consumption and power management. In addition to being a diagnostic tool, PowerTOP also has an interactive mode you can use to experiment with various power management settings, for cases where the Linux distribution has not enabled those settings. PowerTOP reports which system components are most likely to blame for higher-than-needed power consumption, ranging from software applications to active hardware components. Detailed screens are available for CPU C and P states, device activity, and software activity. Highlights * Reduced duplication in CPU code * Improved ARM build support * Various bug fixes and cleanups Thank you to everyone who contributed to this release! Austin Zhang (2): V2: Fix C states and P states presentation issue. Using std::max to handle all such kind of logic Daniel Kahn Gillmor (1): Correct script for tuning wifi power_save with iw Ivan Shapovalov (10): Fix includes: do not include intel_cpus.h inside cpu.h Deduplication: move is_turbo() function to lib Deduplication: move all instances of account_freq() to abstract_cpu::account_freq() Deduplication: remove nhm_cpu::account_freq() almost identical to abstract_cpu::account_freq() Deduplication: remove nhm_{cpu, core, package}::change_effective_frequency() identical to cpu_{linux, core, package}::change_effective_frequency() Deduplication: merge cpu_{core, linux, package}::change_effective_frequency() into abstract_cpu::change_effective_frequency() Deduplication: remove {cpu, nhm}_core::calculate_freq() identical to abstract_cpu::calculate_freq() Deduplication: remove nhm_package::calculate_freq() identical to cpu_package::calculate_freq() Deduplication: properly merge cpu_package::calculate_freq() into abstract_cpu::calculate_freq() Deduplication: merge go_idle()/go_unidle()/change_freq() overrides into abstract_cpu() class Jaroslav Skarvada (1): cpufreq: only try to open files under cpuX Jaroslav Škarvada (2): report: fixed crash when writing report to RO filesystem Do not call abstract_cpu::wiggle for GPU Kristen Carlson Accardi (4): pot update: changes required for transifex due to string change new and modified po files from transifex change version for 2.3 fix issue with string termination Namhyung Kim (4): Use PACKAGE_VERSION for POWERTOP_VERSION process: Get rid of unused dbg_printf_pevent_info() main: 'quiet' option does not take an argument main: Fix output when running workload Paul Menzel (1): src/cpu/cpu.cpp: Fix typo in error message: freque*nc*y Rajagopal Venkat (1): Allow frequency stats when cpuidle is not enabled Sergey Senozhatsky (5): tab_window: null members on construction parameters: fix uninitialized values in param/result getters runtime_pm: register parameters remove csstoh.c measurement: handle multiple batteries in global_time_left() Thomas Waldecker (2): csstoh.sh shell script fixes cross compiling issues csstoh shell-script for cross-compiling Project Details URL: https://01.org/powertop Download: https://01.org/powertop/downloads/2012/PowerTOP-v2.2 Mailing list: Discussions about PowerTOP occur on the PowerTOP at lists.01.org mailing list. Subscribe to the list at https://lists.01.org/mailman/listinfo/powertop Archives are found at http://lists.01.org/pipermail/powertop The development PowerTOP git repositories are hosted at GitHub. URL: https://github.com/fenrus75/powertop HTTP: https://github.com/fenrus75/powertop.git GIT-readonly: git://github.com/fenrus75/powertop.git Note: We will not use any of GitHub's integrate, merge, or tracking functions, so please continue to use the provided lists. For localization support and contributions, we are using Transifex. Transifex URL: https://www.transifex.com/projects/p/PowerTOP/

8 years, 8 months

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[powertop] ::wiggle() - what does that do?

by Ivan Shapovalov

Hello all, I've been wondering on what does the abstract_cpu::wiggle() function does and why it is needed?.. All the code says is that it is needed to "have a record of CPU at the start and end of the perf trace". I'm asking just because I feel somewhat uncomfortable to have powertop changing my scaling frequency back and forth each N seconds. :) Thanks, - Ivan

8 years, 8 months

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new schedule

by Kristen Carlson Accardi

We delayed our string freeze date by 2 weeks to give me a chance to get caught up on patches etc. As a result, the new string freeze date is going to be 2/15, with release planned for March 1. Thanks for your patience. Kristen

8 years, 8 months

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PowerTOP March 2013