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Subject[PATCH 2/5] perf tools: Document event modifiers
From: Sonny Rao <>

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 <>
Cc: Paul Mackerras <>
Cc: Peter Zijlstra <>
Cc: Robert Richter <>
LKML-Reference: <>
Signed-off-by: Sonny Rao <>
Signed-off-by: Arnaldo Carvalho de Melo <>
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.

+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.
Even when an event is not available in a symbolic form within perf right now,

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