Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 00ff7d46 authored by Srinivas Ramana's avatar Srinivas Ramana
Browse files

time: sched_clock: record cycle count in suspend and resume 



Record cycle count and kernel time in nano-seconds 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>
parent c1b67407

kernel/time/sched_clock.c

+11 −0
Original line number Diff line number Diff line
@@ -32,6 +32,10 @@ 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);
@@ -200,6 +204,11 @@ void __init sched_clock_postinit(void) 
static int sched_clock_suspend(void)

{

	update_sched_clock();



	suspend_ns = cd.epoch_ns;

	suspend_cycles = cd.epoch_cyc;

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

				cd.epoch_ns, cd.epoch_cyc);

	hrtimer_cancel(&sched_clock_timer);

	cd.suspended = true;

	return 0;
@@ -208,6 +217,8 @@ static int sched_clock_suspend(void) 
static void sched_clock_resume(void)

{

	cd.epoch_cyc = read_sched_clock();

	resume_cycles = cd.epoch_cyc;

	pr_info("resume cycles:%17llu\n", cd.epoch_cyc);

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

	cd.suspended = false;

}