linux-kernel - [PATCH 06/12] perf tools: Do not erase uncovered maps by kcore

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Date:   Tue, 16 Apr 2019 18:01:21 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH 06/12] perf tools: Do not erase uncovered maps by kcore

Maps in kcore do not cover bpf maps, so we can't just
remove everything. Keeping all kernel maps, which are
not covered by kcore maps.

Link: http://lkml.kernel.org/n/tip-9eytka8wofp0a047ul6lmejk@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/symbol.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 5cbad55cd99d..96738a7a8c14 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1166,6 +1166,18 @@ static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
 	return 0;
 }
 
+static bool in_kcore(struct kcore_mapfn_data *md, struct map *map)
+{
+	struct map *iter;
+
+	list_for_each_entry(iter, &md->maps, node) {
+		if ((map->start >= iter->start) && (map->start < iter->end))
+			return true;
+	}
+
+	return false;
+}
+
 static int dso__load_kcore(struct dso *dso, struct map *map,
 			   const char *kallsyms_filename)
 {
@@ -1222,7 +1234,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
 	while (old_map) {
 		struct map *next = map_groups__next(old_map);
 
-		if (old_map != map)
+		if (old_map != map && !in_kcore(&md, old_map))
 			map_groups__remove(kmaps, old_map);
 		old_map = next;
 	}
-- 
2.17.2