From 0f34c400914f165b7b3812459be2d77b8aa1f1e4 Mon Sep 17 00:00:00 2001 From: Chuansheng Liu Date: Mon, 17 Dec 2012 15:59:50 -0800 Subject: watchdog: store the watchdog sample period as a variable Currently getting the sample period is always thru a complex calculation: get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5). We can store the sample period as a variable, and set it as __read_mostly type. Signed-off-by: liu chuansheng Cc: Don Zickus Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/watchdog.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) (limited to 'kernel') diff --git a/kernel/watchdog.c b/kernel/watchdog.c index c8c21be11ab4..997c6a16ec22 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -31,6 +31,7 @@ int watchdog_enabled = 1; int __read_mostly watchdog_thresh = 10; static int __read_mostly watchdog_disabled; +static u64 __read_mostly sample_period; static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts); static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog); @@ -116,7 +117,7 @@ static unsigned long get_timestamp(int this_cpu) return cpu_clock(this_cpu) >> 30LL; /* 2^30 ~= 10^9 */ } -static u64 get_sample_period(void) +static void set_sample_period(void) { /* * convert watchdog_thresh from seconds to ns @@ -125,7 +126,7 @@ static u64 get_sample_period(void) * and hard thresholds) to increment before the * hardlockup detector generates a warning */ - return get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5); + sample_period = get_softlockup_thresh() * ((u64)NSEC_PER_SEC / 5); } /* Commands for resetting the watchdog */ @@ -275,7 +276,7 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer) wake_up_process(__this_cpu_read(softlockup_watchdog)); /* .. and repeat */ - hrtimer_forward_now(hrtimer, ns_to_ktime(get_sample_period())); + hrtimer_forward_now(hrtimer, ns_to_ktime(sample_period)); if (touch_ts == 0) { if (unlikely(__this_cpu_read(softlockup_touch_sync))) { @@ -356,7 +357,7 @@ static void watchdog_enable(unsigned int cpu) hrtimer->function = watchdog_timer_fn; /* done here because hrtimer_start can only pin to smp_processor_id() */ - hrtimer_start(hrtimer, ns_to_ktime(get_sample_period()), + hrtimer_start(hrtimer, ns_to_ktime(sample_period), HRTIMER_MODE_REL_PINNED); /* initialize timestamp */ @@ -386,7 +387,7 @@ static int watchdog_should_run(unsigned int cpu) /* * The watchdog thread function - touches the timestamp. * - * It only runs once every get_sample_period() seconds (4 seconds by + * It only runs once every sample_period seconds (4 seconds by * default) to reset the softlockup timestamp. If this gets delayed * for more than 2*watchdog_thresh seconds then the debug-printout * triggers in watchdog_timer_fn(). @@ -519,6 +520,7 @@ int proc_dowatchdog(struct ctl_table *table, int write, if (ret || !write) return ret; + set_sample_period(); if (watchdog_enabled && watchdog_thresh) watchdog_enable_all_cpus(); else @@ -540,6 +542,7 @@ static struct smp_hotplug_thread watchdog_threads = { void __init lockup_detector_init(void) { + set_sample_period(); if (smpboot_register_percpu_thread(&watchdog_threads)) { pr_err("Failed to create watchdog threads, disabled\n"); watchdog_disabled = -ENODEV; -- cgit v1.2.3-59-g8ed1b