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Subject[PATCH 05/19] perf tools: Add refcnt into struct mem_info
Date
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-vwr82ygpfv4kisaxfyopaef6@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@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* become out-of-date due to an exec() or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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