linux-kernel - Re: [PATCH] x86: Distinguish TLB shootdown interrupts from other functions call interrupts

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Date:	Thu, 20 Sep 2012 09:18:53 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Tomoki Sekiyama <tomoki.sekiyama.qu@...achi.com>
CC:	x86@...nel.org, yrl.pp-manager.tt@...achi.com,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: Distinguish TLB shootdown interrupts from other
 functions call interrupts


> @@ -147,7 +148,7 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
>  #ifdef CONFIG_SMP
>  	sum += irq_stats(cpu)->irq_resched_count;
>  	sum += irq_stats(cpu)->irq_call_count;
> -	sum += irq_stats(cpu)->irq_tlb_count;
> +	/* irq_tlb_count is already added to irq_call_count */


redundant comments here?

>  #endif
>  #ifdef CONFIG_X86_THERMAL_VECTOR
>  	sum += irq_stats(cpu)->irq_thermal_count;
> diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
> index 613cd83..0a054db 100644
> --- a/arch/x86/mm/tlb.c
> +++ b/arch/x86/mm/tlb.c
> @@ -98,6 +98,9 @@ static void flush_tlb_func(void *info)
>  {
>  	struct flush_tlb_info *f = info;
>  
> +	/* irq_call_cnt is also incremented; be subtracted on display */


If is it better to move above explanation to irq_call_cnt definition place: harirq.h?

> +	inc_irq_stat(irq_tlb_count);
> +
>  	if (f->flush_mm != this_cpu_read(cpu_tlbstate.active_mm))
>  		return;
>  
> 



-- 
Thanks
    Alex
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