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