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Subject[PATCH 48/57] perf c2c report: Allow to report callchains
Date
Add --call-graph option to properly setup callchain
code. Adding default settings to display callchains
whenever they are stored in the perf.data.

Link: http://lkml.kernel.org/n/tip-inykbom2f19difvsu1e18avr@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/builtin-c2c.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 71b6850809a2..31e311959480 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -17,6 +17,7 @@
#include "evsel.h"
#include <asm/bug.h>
#include "ui/browsers/hists.h"
+#include "evlist.h"

struct c2c_hists {
struct hists hists;
@@ -181,6 +182,11 @@ static int process_sample_event(struct perf_tool *tool __maybe_unused,
return -1;
}

+ ret = sample__resolve_callchain(sample, &callchain_cursor, NULL,
+ evsel, &al, sysctl_perf_event_max_stack);
+ if (ret)
+ goto out;
+
mi = sample__resolve_mem(sample, &al);
if (mi == NULL)
return -ENOMEM;
@@ -2114,6 +2120,58 @@ static void ui_quirks(void)
}
}

+#define CALLCHAIN_DEFAULT_OPT "graph,0.5,caller,function,percent"
+
+const char callchain_help[] = "Display call graph (stack chain/backtrace):\n\n"
+ CALLCHAIN_REPORT_HELP
+ "\n\t\t\t\tDefault: " CALLCHAIN_DEFAULT_OPT;
+
+static int
+parse_callchain_opt(const struct option *opt, const char *arg, int unset)
+{
+ struct callchain_param *callchain = opt->value;
+
+ callchain->enabled = !unset;
+ /*
+ * --no-call-graph
+ */
+ if (unset) {
+ symbol_conf.use_callchain = false;
+ callchain->mode = CHAIN_NONE;
+ return 0;
+ }
+
+ return parse_callchain_report_opt(arg);
+}
+
+static int setup_callchain(struct perf_evlist *evlist)
+{
+ u64 sample_type = perf_evlist__combined_sample_type(evlist);
+ enum perf_call_graph_mode mode = CALLCHAIN_NONE;
+
+ if ((sample_type & PERF_SAMPLE_REGS_USER) &&
+ (sample_type & PERF_SAMPLE_STACK_USER))
+ mode = CALLCHAIN_DWARF;
+ else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
+ mode = CALLCHAIN_LBR;
+ else if (sample_type & PERF_SAMPLE_CALLCHAIN)
+ mode = CALLCHAIN_FP;
+
+ if (!callchain_param.enabled &&
+ callchain_param.mode != CHAIN_NONE &&
+ mode != CALLCHAIN_NONE) {
+ symbol_conf.use_callchain = true;
+ if (callchain_register_param(&callchain_param) < 0) {
+ ui__error("Can't register callchain params.\n");
+ return -EINVAL;
+ }
+ }
+
+ callchain_param.record_mode = mode;
+ callchain_param.min_percent = 0;
+ return 0;
+}
+
static int perf_c2c__report(int argc, const char **argv)
{
struct perf_session *session;
@@ -2121,6 +2179,7 @@ static int perf_c2c__report(int argc, const char **argv)
struct perf_data_file file = {
.mode = PERF_DATA_MODE_READ,
};
+ char callchain_default_opt[] = CALLCHAIN_DEFAULT_OPT;
const struct option c2c_options[] = {
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
@@ -2135,6 +2194,10 @@ static int perf_c2c__report(int argc, const char **argv)
#endif
OPT_BOOLEAN(0, "stats", &c2c.stats_only,
"Use the stdio interface"),
+ OPT_CALLBACK_DEFAULT('g', "call-graph", &callchain_param,
+ "print_type,threshold[,print_limit],order,sort_key[,branch],value",
+ callchain_help, &parse_callchain_opt,
+ callchain_default_opt),
OPT_END()
};
int err = 0;
@@ -2176,6 +2239,10 @@ static int perf_c2c__report(int argc, const char **argv)
goto out;
}

+ err = setup_callchain(session->evlist);
+ if (err)
+ goto out_session;
+
if (symbol__init(&session->header.env) < 0)
goto out_session;

--
2.7.4
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