• Thomas Renninger's avatar
    cpuidle/x86/perf: fix power:cpu_idle double end events and throw cpu_idle... · f77cfe4e
    Thomas Renninger authored
    cpuidle/x86/perf: fix power:cpu_idle double end events and throw cpu_idle events from the cpuidle layer
    
    Currently intel_idle and acpi_idle driver show double cpu_idle "exit idle"
    events -> this patch fixes it and makes cpu_idle events throwing less complex.
    
    It also introduces cpu_idle events for all architectures which use
    the cpuidle subsystem, namely:
      - arch/arm/mach-at91/cpuidle.c
      - arch/arm/mach-davinci/cpuidle.c
      - arch/arm/mach-kirkwood/cpuidle.c
      - arch/arm/mach-omap2/cpuidle34xx.c
      - arch/drivers/acpi/processor_idle.c (for all cases, not only mwait)
      - arch/x86/kernel/process.c (did throw events before, but was a mess)
      - drivers/idle/intel_idle.c (did throw events before)
    
    Convention should be:
    Fire cpu_idle events inside the current pm_idle function (not somewhere
    down the the callee tree) to keep things easy.
    
    Current possible pm_idle functions in X86:
    c1e_idle, poll_idle, cpuidle_idle_call, mwait_idle, default_idle
    -> this is really easy is now.
    
    This affects userspace:
    The type field of the cpu_idle power event can now direclty get
    mapped to:
    /sys/devices/system/cpu/cpuX/cpuidle/stateX/{name,desc,usage,time,...}
    instead of throwing very CPU/mwait specific values.
    This change is not visible for the intel_idle driver.
    For the acpi_idle driver it should only be visible if the vendor
    misses out C-states in his BIOS.
    Another (perf timechart) patch reads out cpuidle info of cpu_idle
    events from:
    /sys/.../cpuidle/stateX/*, then the cpuidle events are mapped
    to the correct C-/cpuidle state again, even if e.g. vendors miss
    out C-states in their BIOS and for example only export C1 and C3.
    -> everything is fine.
    Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
    CC: Robert Schoene <robert.schoene@tu-dresden.de>
    CC: Jean Pihet <j-pihet@ti.com>
    CC: Arjan van de Ven <arjan@linux.intel.com>
    CC: Ingo Molnar <mingo@elte.hu>
    CC: Frederic Weisbecker <fweisbec@gmail.com>
    CC: linux-pm@lists.linux-foundation.org
    CC: linux-acpi@vger.kernel.org
    CC: linux-kernel@vger.kernel.org
    CC: linux-perf-users@vger.kernel.org
    CC: linux-omap@vger.kernel.org
    Signed-off-by: default avatarLen Brown <len.brown@intel.com>
    f77cfe4e
process_64.c 15.8 KB