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

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 tools/perf/Documentation/perf-list.txt |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/tools/perf/Documentation/perf-list.txt b/tools/perf/Documentation/perf-list.txt
index 399751b..700afd7 100644
--- a/tools/perf/Documentation/perf-list.txt
+++ b/tools/perf/Documentation/perf-list.txt
@@ -58,6 +58,13 @@ raw encoding of 0x1A8 can be used:
  perf stat -e r1a8 -a sleep 1
  perf record -e r1a8 ...
 
+Some special events on x86 encode additional data in the normally unused 
+[32;63] bits of the raw value. This is particularly used for 
+the OFFCORE_RESPONSE events on Intel Core i7.  The 16bit 
+mask in the OFFCORE_RESPONSE register is put into bits [32;48].
+For example the OFFCORE_RESPONSE_0.ANY_DATA.ANY_CACHE_DRAM event
+is encoded as r00007f11004301b7.
+
 You should refer to the processor specific documentation for getting these
 details. Some of them are referenced in the SEE ALSO section below.
 
-- 
1.7.1

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