Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1361952

[PATCH 2/2] perf, tools: Fix documentation of :ppp in perf list

Show all headers | View raw

From: Andi Kleen <ak@linux.intel.com>

Correctly document what is implemented for :ppp on Intel CPUs in
recent kernels.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Documentation/perf-list.txt | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 240c8ff..fbe52ac 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -40,10 +40,12 @@ address should be. The 'p' modifier 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
+ 3 - SAMPLE_IP must have 0 skid, or uses randomization to avoid
+     sample shadowing effects.
 
 For Intel systems precise event sampling is implemented with PEBS
-which supports up to precise-level 2.
+which supports up to precise-level 2, and precise level 3 for
+some special cases
 
 On AMD systems it is implemented using IBS (up to precise-level 2).
 The precise modifier works with event types 0x76 (cpu-cycles, CPU
-- 
2.5.5

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH 2/2] perf, tools: Fix documentation of :ppp in perf list Andi Kleen <andi@firstfloor.org> - 2016-03-21 17:00 +0100
  Re: [PATCH 2/2] perf, tools: Fix documentation of :ppp in perf list Jiri Olsa <jolsa@redhat.com> - 2016-03-22 09:00 +0100
  [tip:perf/urgent] perf list: Fix documentation of :ppp tip-bot for Andi Kleen <tipbot@zytor.com> - 2016-03-24 08:40 +0100

csiph-web