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

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Date:	Mon, 22 Sep 2014 21:03:57 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...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>,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: RE: [patch 22/26] x86: Add proper vector accounting for HyperV

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Thomas Gleixner
> Sent: Sunday, 23 February, 2014 3:40 PM
> To: LKML
> Cc: Ingo Molnar; Peter Zijlstra; x86; Konrad Rzeszutek Wilk; K. Y. 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.
...
> 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
...

Should this have used a different short string than "THR",
which is already used for "Threshold APIC interrupts"?

---
Rob Elliott    HP Server Storage



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