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    SubjectRe: Oprofile : need to adjust PC by 16 bytes
    On Sat, Nov 15, 2008 at 05:30:58PM +0100, Eric Dumazet wrote:
    > Andi Kleen a écrit :
    > >>>And no, blindly subtracting 16 from IP is not a fix.
    > >>Who mentioned a fix ? I am only giving more fuel to Intel guys so they
    > >>hopefully can give us a working oprofile.
    > >
    > >You would need to implement PEBS support to avoid that problem. But it's a
    > >big
    > >task. perfmon2 implements it already.
    > >
    >
    > Thanks for the information.
    >
    > Hum, so I grabbed perfmon2 git tree, installed various tools...
    >
    > I am quite new to pfmon and tried :
    >
    > # pfmon --system-wide
    > sizeof=64 44
    > <press ENTER to stop session>
    >
    > Then started "tbench 8", and got a kernel panic after 6 seconds.
    >
    >
    > I was using oprofile like this
    >
    > opcontrol --vmlinux=/path/vmlinux --start
    > // doing some benchmarking...
    > opreport -l vmlinux | head -n 40
    >
    >
    > What would be a working equivalent for perfmon2 based tools ?

    Probably getting a perfmon tree that works. I guess Stephane
    can help (cc'ed). Or just deal with imprecise events for now.

    -Andi
    --
    ak@linux.intel.com
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