perf report: Make --branch-history work without callgraphs(-g) option in perf record
perf record -b -g <command>
perf report --branch-history
This merges the LBRs with the callgraphs.
However it would be nice if it also works without callgraphs (-g) set in
perf record, so that only the LBRs are displayed. But currently perf
report errors in this case. For example,
perf record -b <command>
perf report --branch-history
Error:
Selected -g or --branch-history but no callchain data. Did
you call 'perf record' without -g?
This patch displays the LBRs only even if callgraphs(-g) is not enabled
in perf record.
Change log:
v2: According to Milian Wolff's comment, change the obsolete error
message. Now the error message is:
┌─Error:─────────────────────────────────────┐
│Selected -g or --branch-history. │
│But no callchain or branch data. │
│Did you call 'perf record' without -g or -b?│
│ │
│ │
│Press any key... │
└────────────────────────────────────────────┘
When passing the last parameter to hists__fprintf,
changes "|" to "||".
hists__fprintf(hists, !quiet, 0, 0, rep->min_percent, stdout,
symbol_conf.use_callchain || symbol_conf.show_branchflag_count);
Signed-off-by: Yao Jin <yao.jin@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1494240182-28899-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 983b238..bace342 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -279,10 +279,11 @@ static int report__setup_sample_type(struct report *rep)
"'perf record' without -g?\n");
return -EINVAL;
}
- if (symbol_conf.use_callchain) {
- ui__error("Selected -g or --branch-history but no "
- "callchain data. Did\n"
- "you call 'perf record' without -g?\n");
+ if (symbol_conf.use_callchain &&
+ !symbol_conf.show_branchflag_count) {
+ ui__error("Selected -g or --branch-history.\n"
+ "But no callchain or branch data.\n"
+ "Did you call 'perf record' without -g or -b?\n");
return -1;
}
} else if (!callchain_param.enabled &&
@@ -417,7 +418,8 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
hists__fprintf_nr_sample_events(hists, rep, evname, stdout);
hists__fprintf(hists, !quiet, 0, 0, rep->min_percent, stdout,
- symbol_conf.use_callchain);
+ symbol_conf.use_callchain ||
+ symbol_conf.show_branchflag_count);
fprintf(stdout, "\n\n");
}
