It's passed along several hists entries in --hierarchy mode,
so it's better we keep track of it.

The current fail I see is that it gets removed in hierarchy
--mem-mode mode, where it's shared in the different hierarchies,
but removed from the template hist entry, so the report crashes.

Link: http://lkml.kernel.org/n/tip-vwr82ygpfv4kisaxfyopa...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/util/hist.c    |  4 ++--
 tools/perf/util/machine.c |  2 +-
 tools/perf/util/symbol.c  | 22 ++++++++++++++++++++++
 tools/perf/util/symbol.h  | 19 ++++++++++++++++---
 4 files changed, 41 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 44a8456cea10..7d968892ee39 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -536,7 +536,7 @@ static struct hist_entry *hists__findnew_entry(struct hists 
*hists,
                         * This mem info was allocated from sample__resolve_mem
                         * and will not be used anymore.
                         */
-                       zfree(&entry->mem_info);
+                       mem_info__zput(entry->mem_info);
 
                        /* If the map of an existing hist_entry has
                         * become out-of-date due to an exec() or
@@ -1139,7 +1139,7 @@ void hist_entry__delete(struct hist_entry *he)
        if (he->mem_info) {
                map__zput(he->mem_info->iaddr.map);
                map__zput(he->mem_info->daddr.map);
-               zfree(&he->mem_info);
+               mem_info__zput(he->mem_info);
        }
 
        zfree(&he->stat_acc);
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 12b7427444a3..d46c98d6dedd 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1697,7 +1697,7 @@ static void ip__resolve_data(struct thread *thread,
 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
                                     struct addr_location *al)
 {
-       struct mem_info *mi = zalloc(sizeof(*mi));
+       struct mem_info *mi = mem_info__aloc();
 
        if (!mi)
                return NULL;
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index a1a312d99f30..117cd25cd21a 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2221,3 +2221,25 @@ int symbol__config_symfs(const struct option *opt 
__maybe_unused,
        free(bf);
        return 0;
 }
+
+struct mem_info *mem_info__get(struct mem_info *mi)
+{
+       if (mi)
+               refcount_inc(&mi->refcnt);
+       return mi;
+}
+
+void mem_info__put(struct mem_info *mi)
+{
+       if (mi && refcount_dec_and_test(&mi->refcnt))
+               free(mi);
+}
+
+struct mem_info *mem_info__aloc(void)
+{
+       struct mem_info *mi = zalloc(sizeof(*mi));
+
+       if (mi)
+               refcount_set(&mi->refcnt, 1);
+       return mi;
+}
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 0563f33c1eb3..7e3ac7f35d63 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -200,9 +200,10 @@ struct branch_info {
 };
 
 struct mem_info {
-       struct addr_map_symbol iaddr;
-       struct addr_map_symbol daddr;
-       union perf_mem_data_src data_src;
+       struct addr_map_symbol  iaddr;
+       struct addr_map_symbol  daddr;
+       union perf_mem_data_src data_src;
+       refcount_t              refcnt;
 };
 
 struct addr_location {
@@ -389,4 +390,16 @@ int sdt_notes__get_count(struct list_head *start);
 #define SDT_NOTE_NAME "stapsdt"
 #define NR_ADDR 3
 
+struct mem_info *mem_info__aloc(void);
+struct mem_info *mem_info__get(struct mem_info *mi);
+void   mem_info__put(struct mem_info *mi);
+
+static inline void __mem_info__zput(struct mem_info **mi)
+{
+       mem_info__put(*mi);
+       *mi = NULL;
+}
+
+#define mem_info__zput(mi) __mem_info__zput(&mi)
+
 #endif /* __PERF_SYMBOL */
-- 
2.13.6

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