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SubjectRE: [PATCH 0/26] oprofile: Performance counter multiplexing

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.


-----Original Message-----
From: Andi Kleen []
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 <> writes:
> If unsure, say N.
> + 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?


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