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Commit f121a71a authored by Srinivas Ramana's avatar Srinivas Ramana Committed by Murali Nalajala
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time: sched_clock: record cycle count in suspend and resume 



Record cycle count and kernel time in ns while entering suspend
and while resuming. This will help in matching up the kernel time
with external subsystems and in recording suspend time in cycles.

Change-Id: If22d9880103c7d54087d0faf4c992259e6b97f08
Signed-off-by: default avatarSrinivas Ramana <sramana@codeaurora.org>
Signed-off-by: default avatarElliot Berman <eberman@codeaurora.org>
Signed-off-by: default avatarMurali Nalajala <mnalajal@codeaurora.org>
parent de2adf46

kernel/time/sched_clock.c

+17 −0
Original line number Diff line number Diff line
@@ -71,6 +71,12 @@ struct clock_data { 
static struct hrtimer sched_clock_timer;

static int irqtime = -1;



#ifdef CONFIG_PRINT_SUSPEND_EPOCH_QGKI

static u64 suspend_ns;

static u64 suspend_cycles;

static u64 resume_cycles;

#endif



core_param(irqtime, irqtime, int, 0400);



static u64 notrace jiffy_sched_clock_read(void)
@@ -280,6 +286,13 @@ int sched_clock_suspend(void) 
	struct clock_read_data *rd = &cd.read_data[0];



	update_sched_clock();



#ifdef CONFIG_PRINT_SUSPEND_EPOCH_QGKI

	suspend_ns = rd->epoch_ns;

	suspend_cycles = rd->epoch_cyc;

	pr_info("suspend ns:%17llu      suspend cycles:%17llu\n",

				rd->epoch_ns, rd->epoch_cyc);

#endif

	hrtimer_cancel(&sched_clock_timer);

	rd->read_sched_clock = suspended_sched_clock_read;
@@ -292,6 +305,10 @@ void sched_clock_resume(void) 


	rd->epoch_cyc = cd.actual_read_sched_clock();

	hrtimer_start(&sched_clock_timer, cd.wrap_kt, HRTIMER_MODE_REL_HARD);

#ifdef CONFIG_PRINT_SUSPEND_EPOCH_QGKI

	resume_cycles = rd->epoch_cyc;

	pr_info("resume cycles:%17llu\n", rd->epoch_cyc);

#endif

	rd->read_sched_clock = cd.actual_read_sched_clock;

}