Re: [trinity-devel] tdepowersave - found new race condition (that explains the constant 3-5%)

Hello, I've been instigating the CPU wasting issue in tdepowersave as well. I've found out that the CPU cycles are mostly eaten by the TDEHW library, not in tdepowersave itself. See: tdelibs/tdecore/tdehw/tdehardwaredevice.cpp At line 244 and 246, you can see that there are 2 timers that are initialized. The 1st timer is used to poll for CPU-related changes every 500ms. It triggers a function line 409:    void TDEHardwareDevices::processModifiedCPUs() The 2nd timer ise used to poll other-devices changes every 1000ms. It triggers a function line 740:    void TDEHardwareDevices::processStatelessDevices() After tracing, it looks like the 2nd timer is the most CPU-eating. It basically rescans all hardware devices of the computer ! On the other side, as you have found, tdepowersave receives notification for every device in the system, and must filter the interesting one (cpu-related or battery-related). I think there are 2 different solutions here: 1) find a way to remove the periodic polling and use notifications from kernel instead (but how ?) 2) optimize the polling code so that it eats less CPU