linux-kernel - Re: [patch 05/24] perfmon: X86 generic code (x86)

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Message-ID: <7c86c4470811270537y57577314we44d3d81b5f7d4a7@mail.gmail.com>
Date:	Thu, 27 Nov 2008 14:37:47 +0100
From:	"stephane eranian" <eranian@...glemail.com>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"Andi Kleen" <andi@...stfloor.org>,
	"David Miller" <davem@...emloft.net>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, mingo@...e.hu, x86@...nel.org,
	sfr@...b.auug.org.au
Subject: Re: [patch 05/24] perfmon: X86 generic code (x86)

On Thu, Nov 27, 2008 at 2:32 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
> On Thu, 27 Nov 2008, stephane eranian wrote:
>> That's true for Intel.
>> On AMD64, I think you can get at most one sample out of a irq-off
>> region using IBS.
>
> Exactly the same amount which you get with the NMI/self_IPI out of an
> irq-off region.
>
Why would you get only one sample per irq-off region if you use NMI?
I would think you could get multiple, depending on your sampling period
and the size of the region.
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