From 800d3f561659b5436f8c57e7c26dd1f6928b5615 Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Fri, 11 Oct 2019 10:21:22 +0800 Subject: [PATCH] perf report: Add warning when libunwind not compiled in We received a user report that call-graph DWARF mode was enabled in 'perf record' but 'perf report' didn't unwind the callstack correctly. The reason was, libunwind was not compiled in. We can use 'perf -vv' to check the compiled libraries but it would be valuable to report a warning to user directly (especially valuable for a perf newbie). The warning is: Warning: Please install libunwind development packages during the perf build. Both TUI and stdio are supported. Signed-off-by: Jin Yao Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/20191011022122.26369-1-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-report.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index aae0e57c60fb..7accaf8ef689 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -399,6 +399,13 @@ static int report__setup_sample_type(struct report *rep) PERF_SAMPLE_BRANCH_ANY)) rep->nonany_branch_mode = true; +#ifndef HAVE_LIBUNWIND_SUPPORT + if (dwarf_callchain_users) { + ui__warning("Please install libunwind development packages " + "during the perf build.\n"); + } +#endif + return 0; } -- 2.30.2