From fa50fc268b8e891db927235c5ef18d439c049c7a Mon Sep 17 00:00:00 2001 From: Srinivas Ramana Date: Wed, 23 Nov 2016 16:43:42 +0530 Subject: 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: Srinivas Ramana --- kernel/time/sched_clock.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'kernel') diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c index 0637823aa5a6..699aff70bbfa 100644 --- a/kernel/time/sched_clock.c +++ b/kernel/time/sched_clock.c @@ -71,6 +71,10 @@ struct clock_data { static struct hrtimer sched_clock_timer; static int irqtime = -1; static int initialized; +static u64 suspend_ns; +static u64 suspend_cycles; +static u64 resume_cycles; + core_param(irqtime, irqtime, int, 0400); @@ -282,6 +286,11 @@ static int sched_clock_suspend(void) struct clock_read_data *rd = &cd.read_data[0]; update_sched_clock(); + + 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); hrtimer_cancel(&sched_clock_timer); rd->read_sched_clock = suspended_sched_clock_read; @@ -293,6 +302,8 @@ static void sched_clock_resume(void) struct clock_read_data *rd = &cd.read_data[0]; rd->epoch_cyc = cd.actual_read_sched_clock(); + resume_cycles = rd->epoch_cyc; + pr_info("resume cycles:%17llu\n", rd->epoch_cyc); hrtimer_start(&sched_clock_timer, cd.wrap_kt, HRTIMER_MODE_REL); rd->read_sched_clock = cd.actual_read_sched_clock; } -- cgit v1.2.3