linux-kernel - [tip:perf/core] perf callchain: Compare symbol name for inlined frames when matching

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Date:   Wed, 25 Oct 2017 10:19:13 -0700
From:   tip-bot for Milian Wolff <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, hpa@...or.com, acme@...hat.com,
        dsahern@...il.com, namhyung@...nel.org, tglx@...utronix.de,
        peterz@...radead.org, jolsa@...hat.com, milian.wolff@...b.com,
        ravi.bangoria@...ux.vnet.ibm.com, mingo@...nel.org,
        yao.jin@...ux.intel.com
Subject: [tip:perf/core] perf callchain: Compare symbol name for inlined
 frames when matching

Commit-ID:  9856240ad3269f2fdab0b2fa4400ef8aab792061
Gitweb:     https://git.kernel.org/tip/9856240ad3269f2fdab0b2fa4400ef8aab792061
Author:     Milian Wolff <milian.wolff@...b.com>
AuthorDate: Mon, 9 Oct 2017 22:33:03 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 24 Oct 2017 09:59:56 -0300

perf callchain: Compare symbol name for inlined frames when matching

The fake symbols we create for inlined frames will represent different
functions but can use the symbol start address. This leads to issues
when different inline branches all lead to the same function.

Before:
~~~~~
$ perf report -s sym -i perf.inlining.data --inline --stdio -g function
...
             --38.86%--_start
                       __libc_start_main
                       main
                       |
                        --37.57%--std::norm<double> (inlined)
                                  std::_Norm_helper<true>::_S_do_it<double> (inlined)
                                  |
                                   --36.36%--std::abs<double> (inlined)
                                             std::__complex_abs (inlined)
                                             |
                                              --12.24%--std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul>::operator() (inlined)
                                                        std::__detail::__mod<unsigned long, 2147483647ul, 16807ul, 0ul> (inlined)
                                                        std::__detail::_Mod<unsigned long, 2147483647ul, 16807ul, 0ul, true, true>::__calc (inlined)
~~~~~

Note that this backtrace representation is completely bogus.
Complex abs does not call the linear congruential engine! It
is just a side-effect of a longer inlined stack being appended
to a shorter, different inlined stack, both of which originate
in the same function (main).

This patch fixes the issue:

~~~~~
$ perf report -s sym -i perf.inlining.data --inline --stdio -g function
...
             --38.86%--_start
                       __libc_start_main
                       main
                       |
                       |--35.59%--std::uniform_real_distribution<double>::operator()<std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul> > (inlined)
                       |          std::uniform_real_distribution<double>::operator()<std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul> > (inlined)
                       |          |
                       |           --34.37%--std::__detail::_Adaptor<std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul>, double>::operator() (inlined)
                       |                     std::generate_canonical<double, 53ul, std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul> > (inlined)
                       |                     |
                       |                      --12.24%--std::linear_congruential_engine<unsigned long, 16807ul, 0ul, 2147483647ul>::operator() (inlined)
                       |                                std::__detail::__mod<unsigned long, 2147483647ul, 16807ul, 0ul> (inlined)
                       |                                std::__detail::_Mod<unsigned long, 2147483647ul, 16807ul, 0ul, true, true>::__calc (inlined)
                       |
                        --1.99%--std::norm<double> (inlined)
                                  std::_Norm_helper<true>::_S_do_it<double> (inlined)
                                  std::abs<double> (inlined)
                                  std::__complex_abs (inlined)
~~~~~

Signed-off-by: Milian Wolff <milian.wolff@...b.com>
Reviewed-by: Jiri Olsa <jolsa@...hat.com>
Reviewed-by: Namhyung Kim <namhyung@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
Cc: Yao Jin <yao.jin@...ux.intel.com>
Link: http://lkml.kernel.org/r/20171009203310.17362-10-milian.wolff@kdab.com
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
[ Fix up conflict with c1fbc0cf81f1 ("perf callchain: Compare dsos (as well) for CCKEY_FUNCTION"), remove unneeded hunk ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/callchain.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 77031ef..35a920f 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -690,6 +690,14 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
 	}
 
 	if (cnode->ms.sym && sym && callchain_param.key == CCKEY_FUNCTION) {
+		/*
+		 * Compare inlined frames based on their symbol name because
+		 * different inlined frames will have the same symbol start
+		 */
+		if (cnode->ms.sym->inlined || node->sym->inlined)
+			return match_chain_strings(cnode->ms.sym->name,
+						   node->sym->name);
+
 		left = cnode->ms.sym->start;
 		right = sym->start;
 		left_dso = cnode->ms.map->dso;