linux-kernel - [tip:irq/core] x86: Add proper vector accounting for HYPERVISOR_CALLBACK

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Date:	Tue, 4 Mar 2014 08:42:36 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	mingo@...nel.org, konrad.wilk@...cle.com, kys@...rosoft.com,
	peterz@...radead.org, tglx@...utronix.de
Subject: [tip:irq/core] x86:
  Add proper vector accounting for HYPERVISOR_CALLBACK_VECTOR

Commit-ID:  929320e4b4c10708d3477d7e395f0ce7b0cc8744
Gitweb:     http://git.kernel.org/tip/929320e4b4c10708d3477d7e395f0ce7b0cc8744
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Sun, 23 Feb 2014 21:40:20 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 4 Mar 2014 17:37:54 +0100

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@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: K. Y. Srinivasan <kys@...rosoft.com>
Cc: x86 <x86@...nel.org>
Link: http://lkml.kernel.org/r/20140223212738.681855582@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/hardirq.h | 3 +++
 arch/x86/kernel/irq.c          | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index ab0ae1a..afb6536 100644
--- 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 d99f31d..42805fa 100644
--- a/arch/x86/kernel/irq.c
+++ b/arch/x86/kernel/irq.c
@@ -125,6 +125,12 @@ int arch_show_interrupts(struct seq_file *p, int prec)
 		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)
 	seq_printf(p, "%*s: %10u\n", prec, "MIS", atomic_read(&irq_mis_count));
--
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