cpuidle: Add an addtional trace for demoted c-states
Subsystems (2)
PATCH 1/1 cpuidle: Add an addtional trace for demoted c-states
This patch enables tracing of c-states that the device eventually goes in to, which might be different from what the governor had retuned. This scenario occurs in platforms like Intel Medfield. Power tools like pytimechart will be able to display accurate c-state transitions with the help of this trace.
Signed-off-by John Mathew <[email protected]>
--- drivers/cpuidle/cpuidle.c | 3 +++ include/trace/events/power.h | 23 +++++++++++++++++++++++ 2 files changed, 26 insertions(+), 0 deletions(-)
drivers/cpuidle/cpuidle.c +3 -0
@@ -110,6 +110,9 @@ int cpuidle_idle_call(void) dev->last_residency = target_state->enter (dev, target_state); +if (dev->last_state != target_state) +trace_power_demoted (POWER_CSTATE , dev->last_state->name, dev->cpu); +trace_power_end (dev->cpu);trace_cpu_idle (PWR_EVENT_EXIT , dev->cpu);
include/trace/events/power.h +23 -0
@@ -101,6 +101,29 @@ DEFINE_EVENT(power, power_start,TP_ARGS (type, state, cpu_id) ); +TRACE_EVENT (power_demoted, + + TP_PROTO(unsigned int type, char *state, unsigned int cpu_id), + +TP_ARGS (type, state, cpu_id), + +TP_STRUCT__entry ( + __field( u64, type ) + __string( state, state ) +__field ( u64, cpu_id ) + ), + +TP_fast_assign ( + __entry->type = type; + __assign_str(state, state); + __entry->cpu_id = cpu_id; + ), + +TP_printk ("type=%lu state=%s cpu_id=%lu" , (unsigned long )__entry->type, +__get_str (state), (unsigned long )__entry->cpu_id) + +); + DEFINE_EVENT(power, power_frequency, TP_PROTO(unsigned int type, unsigned int state, unsigned int cpu_id),
Signature · 12 lines
1.7.4.1 --------------------------------------------------------------------- Intel Finland Oy Registered Address: PL 281, 00181 Helsinki Business Identity Code: 0357606 - 4 Domiciled in Helsinki This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.