While infrequent it's better if all per CPU events have a counter.
Only done for x86 currently.
Cc: tglx@linutronix.de
Signed-off-by: Andi Kleen <ak@suse.de>
---
arch/x86/kernel/irq_32.c | 7 +++++++
arch/x86/kernel/irq_64.c | 7 +++++++
include/linux/clocksource.h | 3 +++
kernel/time/clocksource.c | 5 +++++
4 files changed, 22 insertions(+)
Index: linux/arch/x86/kernel/irq_32.c
===================================================================
--- linux.orig/arch/x86/kernel/irq_32.c
+++ linux/arch/x86/kernel/irq_32.c
@@ -15,6 +15,7 @@
#include <linux/notifier.h>
#include <linux/cpu.h>
#include <linux/delay.h>
+#include <linux/clocksource.h>
#include <asm/apic.h>
#include <asm/uaccess.h>
@@ -315,6 +316,12 @@ skip:
per_cpu(irq_stat,j).irq_tlb_count);
seq_printf(p, " TLB shootdowns\n");
#endif
+#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
+ seq_printf(p, "CDG: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", per_cpu(clock_wdog_count,j));
+ seq_printf(p, " Clocksource Watchdog checks\n");
+#endif
seq_printf(p, "TRM: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
Index: linux/include/linux/clocksource.h
===================================================================
--- linux.orig/include/linux/clocksource.h
+++ linux/include/linux/clocksource.h
@@ -14,6 +14,7 @@
#include <linux/list.h>
#include <linux/cache.h>
#include <linux/timer.h>
+#include <linux/percpu.h>
#include <asm/div64.h>
#include <asm/io.h>
@@ -232,4 +233,6 @@ static inline void update_vsyscall_tz(vo
}
#endif
+DECLARE_PER_CPU(unsigned, clock_wdog_count);
+
#endif /* _LINUX_CLOCKSOURCE_H */
Index: linux/kernel/time/clocksource.c
===================================================================
--- linux.orig/kernel/time/clocksource.c
+++ linux/kernel/time/clocksource.c
@@ -76,6 +76,8 @@ static DEFINE_SPINLOCK(watchdog_lock);
static cycle_t watchdog_last;
static unsigned long watchdog_resumed;
+DEFINE_PER_CPU(unsigned, clock_wdog_count);
+
/*
* Interval: 0.5sec Threshold: 0.0625s
*/
@@ -102,6 +104,9 @@ static void clocksource_watchdog(unsigne
int64_t wd_nsec, cs_nsec;
int resumed;
+ per_cpu(clock_wdog_count, get_cpu())++;
+ put_cpu();
+
spin_lock(&watchdog_lock);
resumed = test_and_clear_bit(0, &watchdog_resumed);
Index: linux/arch/x86/kernel/irq_64.c
===================================================================
--- linux.orig/arch/x86/kernel/irq_64.c
+++ linux/arch/x86/kernel/irq_64.c
@@ -13,6 +13,7 @@
#include <linux/seq_file.h>
#include <linux/module.h>
#include <linux/delay.h>
+#include <linux/clocksource.h>
#include <asm/uaccess.h>
#include <asm/io_apic.h>
#include <asm/idle.h>
@@ -139,6 +140,12 @@ skip:
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_count);
seq_printf(p, " Thermal event interrupts\n");
+#ifdef CONFIG_CLOCKSOURCE_WATCHDOG
+ seq_printf(p, "CDG: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", per_cpu(clock_wdog_count,j));
+ seq_printf(p, " Clocksource Watchdog checks\n");
+#endif
seq_printf(p, "THR: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_count);
--
