[PATCH v4 05/24] 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: Ionela Voinescu <ionela.voinescu@xxxxxxx>
Cc: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Lukasz Luba <lukasz.luba@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Perry Yuan <Perry.Yuan@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: Zhao Liu <zhao1.liu@xxxxxxxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: linux-pm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@xxxxxxxxxxxxxxx>
---
Changes since v3:
 * None

Changes since v2:
 * None

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 6ac53f01d989..876396b1d077 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5651,6 +5651,9 @@ void scheduler_tick(bool user_tick)
 	if (housekeeping_cpu(cpu, HK_TYPE_TICK))
 		arch_scale_freq_tick();
 
+	if (sched_ipcc_enabled() && user_tick)
+		arch_update_ipcc(curr);
+
 	sched_clock_tick();
 
 	rq_lock(rq, &rf);
-- 
2.25.1