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    Subject[PATCH x86] [2/16] Add a counter for per cpu clocksource watchdog checks and report them in /proc/interrupts
    Date

    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);

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