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authorKan Liang <kan.liang@linux.intel.com>2022-08-16 15:56:12 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2022-08-27 17:55:17 +0300
commit3126204ce3d9ab083cbdc2d61ab93746232eb89b (patch)
treef95331d8ed59bd305a0e76111785836faf0e7047
parentd72e5cf3cf69d4c68d3b54aea232451b0a8b69d3 (diff)
downloadlinux-3126204ce3d9ab083cbdc2d61ab93746232eb89b.tar.xz
perf docs: Update the documentation for the save_type filter
Update the documentation to reflect the kernel changes. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ian Rogers <irogers@google.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: https://lore.kernel.org/r/20220816125612.2042397-2-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/Documentation/perf-record.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 6ec6d0ba0a72..0228efc96686 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.