perf callchain: Compare dsos (as well) for CCKEY_FUNCTION

Two functions from different binaries can have same start address. Thus,
comparing only start address in match_chain() leads to inconsistent
callchains. Fix this by adding a check for dsos as well.

Ex, https://www.spinics.net/lists/linux-perf-users/msg04067.html

Reported-by: Alexander Pozdneev <pozdneyev@gmail.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Krister Johansen <kjlx@templeofstupid.com>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yao Jin <yao.jin@linux.intel.com>
Cc: zhangmengting@huawei.com
Link: http://lkml.kernel.org/r/20171005091234.5874-1-ravi.bangoria@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index be09d77..a971caf 100644 (file)
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -685,6 +685,8 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
 {
        struct symbol *sym = node->sym;
        u64 left, right;
+       struct dso *left_dso = NULL;
+       struct dso *right_dso = NULL;
 
        if (callchain_param.key == CCKEY_SRCLINE) {
                enum match_result match = match_chain_srcline(node, cnode);
@@ -696,12 +698,14 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
        if (cnode->ms.sym && sym && callchain_param.key == CCKEY_FUNCTION) {
                left = cnode->ms.sym->start;
                right = sym->start;
+               left_dso = cnode->ms.map->dso;
+               right_dso = node->map->dso;
        } else {
                left = cnode->ip;
                right = node->ip;
        }
 
-       if (left == right) {
+       if (left == right && left_dso == right_dso) {
                if (node->branch) {
                        cnode->branch_count++;