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    Subject[PATCH v6 0/4] Add support for parametrized events
    Description of "event parameters" from the documentation patch:

    Event parameters are a basic way for partial events to be specified in
    sysfs with per-event names given to the fields that need to be filled in
    when using a particular event.

    It is intended for supporting cases where the single 'cpu' parameter is
    insufficient. For example, POWER 8 has events for physical
    sockets/cores/cpus that are accessible from with virtual machines. To
    keep using the single 'cpu' parameter we'd need to perform a mapping
    between Linux's cpus and the physical machine's cpus (in this case
    Linux is running under a hypervisor). This isn't possible because
    bindings between our cpus and physical cpus may not be fixed, and we
    probably won't have a "cpu" on each physical cpu.

    Description of the sysfs contents when events are parameterized (copied from an
    included patch):



    In the case of the last example, a value replacing "?" would need
    to be provided by the user selecting the particular event. This is
    refered to as "event parameterization". All non-numerical values
    indicate an event parameter.

    Notes on how perf-list displays parameterized events


    Some pmu events listed by 'perf list' will be displayed with '$xyz' in
    them. For example:


    This means that when provided as an event, a value for ? must also
    be supplied. For example:

    perf stat -e \
    'hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,core=2' ...


    [Jiri Olsa, Sukadev Bhattiprolu] Rather than display
    'starting_index=$core' in perf.list and sysfs and expect user to
    specify a value for 'starting_index', replace 'starting_index' with
    what it really means for the event. i.e for an event, if starting_index
    refers to 'core' then display 'core=?' in both perf list and sysfs (see
    examples above).

    - [Jiri Olsa, Peter Zijlstra] Use '$arg' notation rather than ?
    to indicate event parameters.

    - [Michael Ellerman] Separate the kernel and tool patches in the
    patchset into different patchsets.

    - [Jiri Olsa] Rebase to perf/core tree (fix small merge conflict)

    - [Jiri Olsa] Changed the event parameters are specified. If
    event file specifes 'param=val' make the usage 'param=123'
    rather than 'val=123'. (patch 1,2/10)
    - Shortened event names using "PHYS" and "VCPU" (patch 4/10)
    - Print help message if invalid parameter is specified or required
    parameter is missing.
    - Moved 3 patches that are unrelated to parametrized events into
    a separate patchset.
    - Reordered patches so code changes come first.

    - [Joe Perches, David Laight] Use beNN_to_cpu() instead of guessing
    the size from type.
    - Use kmem_cache_free() to free page allocated with kmem_cache_alloc().
    - Rebase to recent kernel

    Cody P Schafer (4):
    tools/perf: support parsing parameterized events
    tools/perf: extend format_alias() to include event parameters
    perf Documentation: add event parameters
    tools/perf: Document parameterized and symbolic events

    .../testing/sysfs-bus-event_source-devices-events | 6 ++
    tools/perf/Documentation/perf-list.txt | 13 +++
    tools/perf/Documentation/perf-record.txt | 12 +++
    tools/perf/Documentation/perf-stat.txt | 20 ++++-
    tools/perf/util/parse-events.h | 1 +
    tools/perf/util/pmu.c | 92 +++++++++++++++++++---
    6 files changed, 128 insertions(+), 16 deletions(-)


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