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    Subject[PATCH 2/5] perf tools: Document event modifiers
    Date
    From: Sonny Rao <sonnyrao@linux.vnet.ibm.com>

    Existing documentation doesn't discuss event modifiers, so add a description of
    what's currently possible to the documentation of perf-list.

    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Robert Richter <robert.richter@amd.com>
    LKML-Reference: <1287107460-12112-1-git-send-email-sonnyrao@linux.vnet.ibm.com>
    Signed-off-by: Sonny Rao <sonnyrao@linux.vnet.ibm.com>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/Documentation/perf-list.txt | 17 +++++++++++++++++
    1 files changed, 17 insertions(+), 0 deletions(-)

    diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
    index 43e3dd2..399751b 100644
    --- a/tools/perf/Documentation/perf-list.txt
    +++ b/tools/perf/Documentation/perf-list.txt
    @@ -15,6 +15,23 @@ DESCRIPTION
    This command displays the symbolic event types which can be selected in the
    various perf commands with the -e option.

    +EVENT MODIFIERS
    +---------------
    +
    +Events can optionally have a modifer by appending a colon and one or
    +more modifiers. Modifiers allow the user to restrict when events are
    +counted with 'u' for user-space, 'k' for kernel, 'h' for hypervisor.
    +
    +The 'p' modifier can be used for specifying how precise the instruction
    +address should be. The 'p' modifier is currently only implemented for
    +Intel PEBS and can be specified multiple times:
    + 0 - SAMPLE_IP can have arbitrary skid
    + 1 - SAMPLE_IP must have constant skid
    + 2 - SAMPLE_IP requested to have 0 skid
    + 3 - SAMPLE_IP must have 0 skid
    +
    +The PEBS implementation now supports up to 2.
    +
    RAW HARDWARE EVENT DESCRIPTOR
    -----------------------------
    Even when an event is not available in a symbolic form within perf right now,
    --
    1.6.2.5


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