linux-kernel - RE: [PATCH 0/26] oprofile: Performance counter multiplexing

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Message-ID: <0F3CDC76A0A8FB48A8C88865301C4F12973BC0@SAUSEXMB2.amd.com>
Date:	Tue, 28 Jul 2009 17:18:26 -0500
From:	"Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
To:	"Andi Kleen" <andi@...stfloor.org>,
	"Richter, Robert" <robert.richter@....com>
CC:	"LKML" <linux-kernel@...r.kernel.org>,
	"oprofile-list" <oprofile-list@...ts.sourceforge.net>
Subject: RE: [PATCH 0/26] oprofile: Performance counter multiplexing

Hi,

The user-space support is currently in AMD CodeAnalyst utility.  I am
working on the more generic user-space support (non-AMD specific) and
will send the patches to OProfile for review.

Suravee

-----Original Message-----
From: Andi Kleen [mailto:andi@...stfloor.org] 
Sent: Tuesday, July 28, 2009 1:45 PM
To: Richter, Robert
Cc: LKML; oprofile-list
Subject: Re: [PATCH 0/26] oprofile: Performance counter multiplexing

Robert Richter <robert.richter@....com> writes:
>  	  If unsure, say N.
>  
> +config OPROFILE_EVENT_MULTIPLEX
> +	bool "OProfile multiplexing support (EXPERIMENTAL)"
> +	default n
> +	depends on OPROFILE && X86
> +	help
> +	  The number of hardware counters is limited. The multiplexing
> +	  feature enables OProfile to gather more events than counters
> +	  are provided by the hardware. This is realized by switching
> +	  between events at an user specified time interval.
> +

I would suggest to drop that CONFIG and have the code unconditional.
It's not a lot code and should be always available.

Will do more detailed review later and will look at Intel P6 support.

Where's the userland support for this?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.

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