x86: Add proper vector accounting for HYPERVISOR_CALLBACK_VECTOR

HyperV abuses a device interrupt to account for the
HYPERVISOR_CALLBACK_VECTOR.

Provide proper accounting as we have for the other vectors as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: x86 <x86@kernel.org>
Link: http://lkml.kernel.org/r/20140223212738.681855582@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index ab0ae1aa6d0af1c5d64edcd313e5283aa099c04f..afb6536ee3acf4271cef09efcfe1d163d298458c 100644 (file)
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -33,6 +33,9 @@ typedef struct {
 #ifdef CONFIG_X86_MCE_THRESHOLD
        unsigned int irq_threshold_count;
 #endif
+#if defined(CONFIG_HYPERV) || defined(CONFIG_XEN)
+       unsigned int irq_hv_callback_count;
+#endif
 } ____cacheline_aligned irq_cpustat_t;
 
 DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
index d99f31d9a750216204a0c61faef3e489818ef925..42805fac009215ac5c70bdd71fdc2ad5d72dfa89 100644 (file)
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -124,6 +124,12 @@ int arch_show_interrupts(struct seq_file *p, int prec)
        for_each_online_cpu(j)
                seq_printf(p, "%10u ", per_cpu(mce_poll_count, j));
        seq_printf(p, "  Machine check polls\n");
+#endif
+#if defined(CONFIG_HYPERV) || defined(CONFIG_XEN)
+       seq_printf(p, "%*s: ", prec, "THR");
+       for_each_online_cpu(j)
+               seq_printf(p, "%10u ", irq_stats(j)->irq_hv_callback_count);
+       seq_printf(p, "  Hypervisor callback interrupts\n");
 #endif
        seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
 #if defined(CONFIG_X86_IO_APIC)