linux-kernel - [PATCH 2/2] perf docs: Update the documentation for the save

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Date:   Tue, 16 Aug 2022 05:56:12 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...hat.com, linux-kernel@...r.kernel.org
Cc:     eranian@...gle.com, ak@...ux.intel.com, namhyung@...nel.org,
        irogers@...gle.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 2/2] perf docs: Update the documentation for the save_type filter

From: Kan Liang <kan.liang@...ux.intel.com>

Update the documentation to reflect the kernel changes.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 tools/perf/Documentation/perf-record.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 099817ef5150..d5c57ac1ee0a 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -397,6 +397,9 @@ following filters are defined:
 	- abort_tx: only when the target is a hardware transaction abort
 	- cond: conditional branches
 	- save_type: save branch type during sampling in case binary is not available later
+		     For the platforms with Intel Arch LBR support (12th-Gen+ client or
+		     4th-Gen Xeon+ server), the save branch type is unconditionally enabled
+		     when the taken branch stack sampling is enabled.
 
 +
 The option requires at least one branch type among any, any_call, any_ret, ind_call, cond.
-- 
2.35.1