linux-kernel - RE: [patch 22/26] x86: Add proper vector accounting for HyperV

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Date:	Tue, 25 Feb 2014 12:24:58 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
CC:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	x86 <x86@...nel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: RE: [patch 22/26] x86: Add proper vector accounting for HyperV



> -----Original Message-----
> From: Thomas Gleixner [mailto:tglx@...utronix.de]
> Sent: Sunday, February 23, 2014 1:40 PM
> To: LKML
> Cc: Ingo Molnar; Peter Zijlstra; x86; Konrad Rzeszutek Wilk; KY Srinivasan
> Subject: [patch 22/26] x86: Add proper vector accounting for HyperV
> 
> HyperV abuses a device interrupt to account for the
> HYPERVISOR_CALLBACK_VECTOR.
> 
> Provide proper accounting as we have for the other vectors as well.

Thomas,

Thank you for cleaning up this code.

Regards,

K. Y
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: x86 <x86@...nel.org>
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: "K. Y. Srinivasan" <kys@...rosoft.com>
> ---
>  arch/x86/include/asm/hardirq.h |    3 +++
>  arch/x86/kernel/irq.c          |    6 ++++++
>  2 files changed, 9 insertions(+)
> 
> Index: tip/arch/x86/include/asm/hardirq.h
> ==========================================================
> =========
> --- tip.orig/arch/x86/include/asm/hardirq.h
> +++ tip/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);
> Index: tip/arch/x86/kernel/irq.c
> ==========================================================
> =========
> --- tip.orig/arch/x86/kernel/irq.c
> +++ tip/arch/x86/kernel/irq.c
> @@ -125,6 +125,12 @@ int arch_show_interrupts(struct seq_file
>  		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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