From: Ian Rogers <irogers@google.com>
Date: Thu, 7 Dec 2023 01:16:48 +0000 (-0800)
Subject: perf maps: Add remove maps function to remove a map based on callback
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8d5847a61723b4dbb3da3b356925c4928ed14de2;p=linux.git
perf maps: Add remove maps function to remove a map based on callback
Removing maps wasn't being done under the write lock. Similar to
maps__for_each_map(), iterate the entries but in this case remove the
entry based on the result of the callback. If an entry was removed
then maps_by_name() also needs updating, so add missed flush.
In dso__load_kcore(), the test of map to save would always be false with
REFCNT_CHECKING because of a missing RC_CHK_ACCESS/RC_CHK_EQUAL.
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Guilherme Amadio <amadio@gentoo.org>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Li Dong <lidong@vivo.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Nick Terrell <terrelln@fb.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Vincent Whitchurch <vincent.whitchurch@axis.com>
Cc: Wenyu Liu <liuwenyu7@huawei.com>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20231207011722.1220634-15-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index 00e6589bba10d..f13fd3a9686b1 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -13,6 +13,10 @@
#define maps__for_each_entry(maps, map) \
for (map = maps__first(maps); map; map = map_rb_node__next(map))
+#define maps__for_each_entry_safe(maps, map, next) \
+ for (map = maps__first(maps), next = map_rb_node__next(map); map; \
+ map = next, next = map_rb_node__next(map))
+
static void maps__init(struct maps *maps, struct machine *machine)
{
refcount_set(maps__refcnt(maps), 1);
@@ -214,6 +218,26 @@ int maps__for_each_map(struct maps *maps, int (*cb)(struct map *map, void *data)
return ret;
}
+void maps__remove_maps(struct maps *maps, bool (*cb)(struct map *map, void *data), void *data)
+{
+ struct map_rb_node *pos, *next;
+ unsigned int start_nr_maps;
+
+ down_write(maps__lock(maps));
+
+ start_nr_maps = maps__nr_maps(maps);
+ maps__for_each_entry_safe(maps, pos, next) {
+ if (cb(pos->map, data)) {
+ __maps__remove(maps, pos);
+ --RC_CHK_ACCESS(maps)->nr_maps;
+ }
+ }
+ if (maps__maps_by_name(maps) && start_nr_maps != maps__nr_maps(maps))
+ __maps__free_maps_by_name(maps);
+
+ up_write(maps__lock(maps));
+}
+
struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
{
struct map *map = maps__find(maps, addr);
diff --git a/tools/perf/util/maps.h b/tools/perf/util/maps.h
index 8ac30cdaf5bd1..b94ad5c8fea74 100644
--- a/tools/perf/util/maps.h
+++ b/tools/perf/util/maps.h
@@ -36,10 +36,6 @@ struct map_rb_node *map_rb_node__next(struct map_rb_node *node);
struct map_rb_node *maps__find_node(struct maps *maps, struct map *map);
struct map *maps__find(struct maps *maps, u64 addr);
-#define maps__for_each_entry_safe(maps, map, next) \
- for (map = maps__first(maps), next = map_rb_node__next(map); map; \
- map = next, next = map_rb_node__next(map))
-
DECLARE_RC_STRUCT(maps) {
struct rb_root entries;
struct rw_semaphore lock;
@@ -80,6 +76,8 @@ static inline void __maps__zput(struct maps **map)
/* Iterate over map calling cb for each entry. */
int maps__for_each_map(struct maps *maps, int (*cb)(struct map *map, void *data), void *data);
+/* Iterate over map removing an entry if cb returns true. */
+void maps__remove_maps(struct maps *maps, bool (*cb)(struct map *map, void *data), void *data);
static inline struct rb_root *maps__entries(struct maps *maps)
{
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 72f03b875478a..be212ba157dc3 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1239,13 +1239,23 @@ static int kcore_mapfn(u64 start, u64 len, u64 pgoff, void *data)
return 0;
}
+static bool remove_old_maps(struct map *map, void *data)
+{
+ const struct map *map_to_save = data;
+
+ /*
+ * We need to preserve eBPF maps even if they are covered by kcore,
+ * because we need to access eBPF dso for source data.
+ */
+ return !RC_CHK_EQUAL(map, map_to_save) && !__map__is_bpf_prog(map);
+}
+
static int dso__load_kcore(struct dso *dso, struct map *map,
const char *kallsyms_filename)
{
struct maps *kmaps = map__kmaps(map);
struct kcore_mapfn_data md;
struct map *replacement_map = NULL;
- struct map_rb_node *old_node, *next;
struct machine *machine;
bool is_64_bit;
int err, fd;
@@ -1292,17 +1302,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
}
/* Remove old maps */
- maps__for_each_entry_safe(kmaps, old_node, next) {
- struct map *old_map = old_node->map;
-
- /*
- * We need to preserve eBPF maps even if they are
- * covered by kcore, because we need to access
- * eBPF dso for source data.
- */
- if (old_map != map && !__map__is_bpf_prog(old_map))
- maps__remove(kmaps, old_map);
- }
+ maps__remove_maps(kmaps, remove_old_maps, map);
machine->trampolines_mapped = false;
/* Find the kernel map using the '_stext' symbol */