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    Subject[PATCH 10/26] perf Documentation: Add event parameters
    Date
    From: Cody P Schafer <cody@linux.vnet.ibm.com>

    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.

    Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
    Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
    Acked-by: Jiri Olsa <jolsa@kernel.org>
    Cc: Cody P Schafer <dev@codyps.com>
    Cc: Haren Myneni <hbabu@us.ibm.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
    Cc: linuxppc-dev@lists.ozlabs.org
    Link: http://lkml.kernel.org/r/1420679633-28856-4-git-send-email-sukadev@linux.vnet.ibm.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    Documentation/ABI/testing/sysfs-bus-event_source-devices-events | 6 ++++++
    1 file changed, 6 insertions(+)

    diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
    index 20979f8b3edb..505f080d20a1 100644
    --- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
    +++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
    @@ -52,12 +52,18 @@ Description: Per-pmu performance monitoring events specific to the running syste
    event=0x2abc
    event=0x423,inv,cmask=0x3
    domain=0x1,offset=0x8,starting_index=0xffff
    + domain=0x1,offset=0x8,core=?

    Each of the assignments indicates a value to be assigned to a
    particular set of bits (as defined by the format file
    corresponding to the <term>) in the perf_event structure passed
    to the perf_open syscall.

    + In the case of the last example, a value replacing "?" would
    + need to be provided by the user selecting the particular event.
    + This is referred to as "event parameterization". Event
    + parameters have the format 'param=?'.
    +
    What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit
    Date: 2014/02/24
    Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
    --
    1.9.3


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