On 10 Aug 28, vishwanath.sripathy@xxxxxxxxxx wrote: > From: Vishwanath BS <vishwanath.sripathy@xxxxxxxxxx> > > This patch has instrumentation code for measuring latencies for > various CPUIdle C states for OMAP. Idea here is to capture the > timestamp at various phases of CPU Idle and then compute the sw > latency for various c states. For OMAP, 32k clock is chosen as > reference clock this as is an always on clock. wkup domain memory > (scratchpad memory) is used for storing timestamps. One can see the > worstcase latencies in below sysfs entries (after enabling CONFIG_CPU_IDLE_PROF > in .config). This information can be used to correctly configure cpu idle > latencies for various C states after adding HW latencies for each of > these sw latencies. > /sys/devices/system/cpu/cpu0/cpuidle/state<n>/actual_latency > /sys/devices/system/cpu/cpu0/cpuidle/state<n>/sleep_latency > /sys/devices/system/cpu/cpu0/cpuidle/state<n>/wkup_latency > > THis patch is tested on OMAP ZOOM3 using kevin's pm branch. > > Signed-off-by: Vishwanath BS <vishwanath.sripathy@xxxxxxxxxx> > Cc: linaro-dev@xxxxxxxxxxxxxxxx > --- > arch/arm/mach-omap2/cpuidle34xx.c | 58 ++++++++++++++++-- > arch/arm/mach-omap2/pm.h | 5 ++ > arch/arm/mach-omap2/sleep34xx.S | 121 +++++++++++++++++++++++++++++++++++++ > drivers/cpuidle/Kconfig | 5 ++ > drivers/cpuidle/sysfs.c | 16 +++++- > include/linux/cpuidle.h | 3 + > 6 files changed, 202 insertions(+), 6 deletions(-) Vishwa, You should perhaps cc Len Brown and LKML for V2 to get acceptance for the new counters in cpuidle Regards, Amit -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
