[PATCH 07/32] nohz: Rename ts->idle_tick to ts->last_tick

Frederic Weisbecker
2011-08-15T15:58:56Z

Now that idle and nohz logic are getting split, idle_tick becomes
a misnomer when it takes a field name to save the last tick before
switching to nohz.

Call it last_tick instead. This changes a bit the timer list
stat export so we need to increase its version.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Anton Blanchard <anton@au1.ibm.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tim Pepper <lnxninja@linux.vnet.ibm.com>
---
include/linux/tick.h | 8 ++++----
kernel/time/tick-sched.c | 4 ++--
kernel/time/timer_list.c | 4 ++--
3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/linux/tick.h b/include/linux/tick.h
index 04f6418..849a0b2 100644
--- a/include/linux/tick.h
+++ b/include/linux/tick.h
@@ -30,10 +30,10 @@ enum tick_nohz_mode {
* struct tick_sched - sched tick emulation and no idle tick control/stats
* @sched_timer: hrtimer to schedule the periodic tick in high
* resolution mode
- * @idle_tick: Store the last idle tick expiry time when the tick
- * timer is modified for idle sleeps. This is necessary
+ * @last_tick: Store the last tick expiry time when the tick
+ * timer is modified for nohz sleeps. This is necessary
* to resume the tick timer operation in the timeline
- * when the CPU returns from idle
+ * when the CPU returns from nohz sleep.
* @tick_stopped: Indicator that the idle tick has been stopped
* @idle_jiffies: jiffies at the entry to idle for idle time accounting
* @idle_calls: Total number of idle calls
@@ -50,7 +50,7 @@ struct tick_sched {
struct hrtimer sched_timer;
unsigned long check_clocks;
enum tick_nohz_mode nohz_mode;
- ktime_t idle_tick;
+ ktime_t last_tick;
int inidle;
int tick_stopped;
unsigned long idle_jiffies;
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 21b187c..bca1519 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -382,7 +382,7 @@ static void tick_nohz_stop_sched_tick(ktime_t now)
if (!ts->tick_stopped) {
select_nohz_load_balancer(1);

- ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
+ ts->last_tick = hrtimer_get_expires(&ts->sched_timer);
ts->tick_stopped = 1;
}

@@ -468,7 +468,7 @@ ktime_t tick_nohz_get_sleep_length(void)
static void tick_nohz_restart(struct tick_sched *ts, ktime_t now)
{
hrtimer_cancel(&ts->sched_timer);
- hrtimer_set_expires(&ts->sched_timer, ts->idle_tick);
+ hrtimer_set_expires(&ts->sched_timer, ts->last_tick);

while (1) {
/* Forward the time to expire in the future */
diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c
index 3258455..af5a7e9 100644
--- a/kernel/time/timer_list.c
+++ b/kernel/time/timer_list.c
@@ -167,7 +167,7 @@ static void print_cpu(struct seq_file *m, int cpu, u64 now)
{
struct tick_sched *ts = tick_get_tick_sched(cpu);
P(nohz_mode);
- P_ns(idle_tick);
+ P_ns(last_tick);
P(tick_stopped);
P(idle_jiffies);
P(idle_calls);
@@ -259,7 +259,7 @@ static int timer_list_show(struct seq_file *m, void *v)
u64 now = ktime_to_ns(ktime_get());
int cpu;

- SEQ_printf(m, "Timer List Version: v0.6\n");
+ SEQ_printf(m, "Timer List Version: v0.7\n");
SEQ_printf(m, "HRTIMER_MAX_CLOCK_BASES: %d\n", HRTIMER_MAX_CLOCK_BASES);
SEQ_printf(m, "now at %Ld nsecs\n", (unsigned long long)now);

--
1.7.5.4