linux-kernel - [PATCH] perf callchain: Pass relative address to hist entry

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Message-Id: <20171025021209.13180-1-namhyung@kernel.org>
Date:   Wed, 25 Oct 2017 11:12:09 +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,
        Milian Wolff <milian.wolff@...b.com>
Subject: [PATCH] perf callchain: Pass relative address to hist entry

The addr_location->addr should have relative address to be passed to
hist entry so that it can compare with others which might come from a
different address space.

The callchain_cursor_node->ip already has a relative address thus it
should not map it again.  But I found a bug handling cumulative
(children) entries.  For chilren entries that has no self period, the
al->addr (so he->ip) ends up having an doubly-mapped address.

It seems to be there from the beginning but only affects entries that
have no srclines - finding srcline itself is done using a different
address but it will show the invalid address if no srcline was found.

Tested-by: Milian Wolff <milian.wolff@...b.com>
Fixes: c7405d85d7a3 ("perf tools: Update cpumode for each cumulative entry")
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/util/callchain.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 3a3916934a92..837012147c7b 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1091,10 +1091,7 @@ int fill_callchain_info(struct addr_location *al, struct callchain_cursor_node *
 	al->map = node->map;
 	al->sym = node->sym;
 	al->srcline = node->srcline;
-	if (node->map)
-		al->addr = node->map->map_ip(node->map, node->ip);
-	else
-		al->addr = node->ip;
+	al->addr = node->ip;

 	if (al->sym == NULL) {
 		if (hide_unresolved)
-- 
2.14.2