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

From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Namhyung Kim <namhyung@kernel.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Andi Kleen <ak@linux.intel.com>,
	Adrian Hunter <adrian.hunter@intel.com>,
	Song Liu <songliubraving@fb.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>
Subject: [PATCH 06/12] perf tools: Do not erase uncovered maps by kcore
Date: Tue, 16 Apr 2019 18:01:21 +0200	[thread overview]
Message-ID: <20190416160127.30203-7-jolsa@kernel.org> (raw)
In-Reply-To: <20190416160127.30203-1-jolsa@kernel.org>

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@kernel.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

