linux-kernel - [PATCH/RFC 4/9] perf symbols: Load kernel module symbols ASAP

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Date:   Fri, 23 Jun 2017 14:48:22 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@....com,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andi Kleen <andi@...stfloor.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Wang Nan <wangnan0@...wei.com>
Subject: [PATCH/RFC 4/9] perf symbols: Load kernel module symbols ASAP

When loading kernel symbols from /proc/kallsyms, it might have different
addresses for modules.  We should honor the mmap event recorded in a
perf.data so load the module symbols when it sees the event so that it
cannot be overridden by symbols in /proc/kallsyms later.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/machine.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index d838f893e639..799efe920f0c 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -656,6 +656,9 @@ struct map *machine__findnew_module_map(struct machine *machine, u64 start,
 
 	map_groups__insert(&machine->kmaps, map);
 
+	if (dso->has_build_id)
+		map__load(map);
+
 	/* Put the map here because map_groups__insert alread got it */
 	map__put(map);
 out:
-- 
2.13.1