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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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