[PATCH v2 05/22] sched/core: Update the IPC class of the current task

[Ricardo Neri]

When supported, hardware monitors the instruction stream to classify the
current task. Hence, at userspace tick, we are ready to read the most
recent classification result for the current task.

Cc: Ben Segall <bsegall@xxxxxxxxxx>
Cc: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Cc: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Cc: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Tim C. Chen <tim.c.chen@xxxxxxxxx>
Cc: Valentin Schneider <vschneid@xxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
---
Changes since v1:
 * Removed argument smt_siblings_idle from call to arch_ipcc_update().
 * Used the new IPCC interfaces names.
---
 kernel/sched/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 8bb6f597c42b..2cd409536b72 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5496,6 +5496,9 @@ void scheduler_tick(bool user_tick)
 	unsigned long thermal_pressure;
 	u64 resched_latency;
 
+	if (sched_ipcc_enabled() && user_tick)
+		arch_update_ipcc(curr);
+
 	arch_scale_freq_tick();
 	sched_clock_tick();
 
-- 
2.25.1