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Subject[PATCH 3/8] perf, tools: Add --branch-history option to report v2
Date
From: Andi Kleen <ak@linux.intel.com>

Add a --branch-history option to perf report that changes all
the settings necessary for using the branches in callstacks.

This is just a short cut to make this nicer to use, it does
not enable any functionality by itself.

v2: Change sort order. Rename option to --branch-history to
be less confusing.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/Documentation/perf-report.txt | 5 +++++
tools/perf/builtin-report.c | 28 +++++++++++++++++++++++++---
2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 349cd2a..5b270fe 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -228,6 +228,11 @@ OPTIONS
branch stacks and it will automatically switch to the branch view mode,
unless --no-branch-stack is used.

+--branch-history::
+ Add the addresses of sampled taken branches to the callstack.
+ This allows to examine the path the program took to each sample.
+ The data collection must have used -b (or -j) and -g.
+
--objdump=<path>::
Path to objdump binary.

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index f7a9e3d..302c4e8 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -691,6 +691,16 @@ parse_branch_mode(const struct option *opt __maybe_unused,
}

static int
+parse_branch_call_mode(const struct option *opt __maybe_unused,
+ const char *str __maybe_unused, int unset)
+{
+ int *branch_mode = opt->value;
+
+ *branch_mode = !unset;
+ return 0;
+}
+
+static int
parse_percent_limit(const struct option *opt, const char *str,
int unset __maybe_unused)
{
@@ -705,7 +715,7 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
struct perf_session *session;
struct stat st;
bool has_br_stack = false;
- int branch_mode = -1;
+ int branch_mode = -1, branch_call_mode = -1;
int ret = -1;
char callchain_default_opt[] = "fractal,0.5,callee";
const char * const report_usage[] = {
@@ -814,7 +824,11 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
OPT_BOOLEAN(0, "group", &symbol_conf.event_group,
"Show event group information together"),
OPT_CALLBACK_NOOPT('b', "branch-stack", &branch_mode, "",
- "use branch records for histogram filling", parse_branch_mode),
+ "use branch records for per branch histogram filling",
+ parse_branch_mode),
+ OPT_CALLBACK_NOOPT(0, "branch-history", &branch_call_mode, "",
+ "add last branch records to call history",
+ parse_branch_call_mode),
OPT_STRING(0, "objdump", &objdump_path, "path",
"objdump binary to use for disassembly and annotations"),
OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
@@ -862,8 +876,16 @@ repeat:
has_br_stack = perf_header__has_feat(&session->header,
HEADER_BRANCH_STACK);

- if (branch_mode == -1 && has_br_stack)
+ if (branch_mode == -1 && has_br_stack && branch_call_mode == -1)
sort__mode = SORT_MODE__BRANCH;
+ if (branch_call_mode != -1) {
+ callchain_param.branch_callstack = 1;
+ callchain_param.key = CCKEY_ADDRESS;
+ symbol_conf.use_callchain = true;
+ callchain_register_param(&callchain_param);
+ if (sort_order == default_sort_order)
+ sort_order = "srcline,symbol,dso";
+ }

/* sort__mode could be NORMAL if --no-branch-stack */
if (sort__mode == SORT_MODE__BRANCH) {
--
1.8.5.3


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