s390: add trace events for idle enter/exit

Helpful for debugging.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/kernel/idle.c b/arch/s390/kernel/idle.c
index 0d7fbdf..88bb42c 100644 (file)
--- a/arch/s390/kernel/idle.c
+++ b/arch/s390/kernel/idle.c
@@ -14,6 +14,7 @@
 #include <linux/init.h>
 #include <linux/cpu.h>
 #include <linux/sched/cputime.h>
+#include <trace/events/power.h>
 #include <asm/nmi.h>
 #include <asm/smp.h>
 #include "entry.h"
@@ -32,11 +33,12 @@ void enabled_wait(void)
                PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
        clear_cpu_flag(CIF_NOHZ_DELAY);
 
+       trace_cpu_idle_rcuidle(1, smp_processor_id());
        local_irq_save(flags);
        /* Call the assembler magic in entry.S */
        psw_idle(idle, psw_mask);
        local_irq_restore(flags);
-
+       trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
 
        /* Account time spent with enabled wait psw loaded as idle time. */
        write_seqcount_begin(&idle->seqcount);