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    Subject[RFC][PATCH 0/3] perf support for amd guest/host-only bits

    this small set of patches implement support for the amd guest/host-only
    bits into perf. The counting for either host or guest-mode can be
    enabled using two additional attribute-bits.

    The patches are RFC for now for several reasons. First of all, these are
    my first patches for perf, so I likely don't implemented everything the
    perf-way. Another reason is, that when one of these two bits is set, the
    counters will only count when SVM is enabled (with KVM this is only the
    case when a guest runs). So even when host-only is configured (which
    needs to be done explicitly, so no regression, default is still to set
    none of these two bits) the counter will not count at all as long as no
    kvm guest is running. The question is whether this is ok or whether this
    situation needs to be handled (say, count when host-only is specified by
    userspace and svm is disabled). Or we just don't care because specifing
    guest/host-only counting only makes sense with guests anyway. I am open
    for both.

    So any feedback is greatly appreciated :-)




    arch/x86/include/asm/perf_event.h | 3 +++
    arch/x86/kernel/cpu/perf_event_amd.c | 6 ++++++
    include/linux/perf_event.h | 5 ++++-
    kernel/perf_event.c | 4 ++++
    tools/perf/util/parse-events.c | 10 +++++++++-
    5 files changed, 26 insertions(+), 2 deletions(-)


    Joerg Roedel (3):
    perf, core: Introduce attrs to count in either host or guest mode
    perf, x86: Use GO/HO bits in perf-ctr
    perf, tools: Add support for guest/host-only profiling

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      Last update: 2011-05-10 16:39    [W:0.022 / U:230.436 seconds]
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