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Date: Wed, 6 Dec 2023 17:16:36 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Nick Terrell <terrelln@...com>,
Kan Liang <kan.liang@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Huacai Chen <chenhuacai@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Vincent Whitchurch <vincent.whitchurch@...s.com>,
"Steinar H. Gunderson" <sesse@...gle.com>,
Liam Howlett <liam.howlett@...cle.com>,
Miguel Ojeda <ojeda@...nel.org>,
Colin Ian King <colin.i.king@...il.com>,
Dmitrii Dolgov <9erthalion6@...il.com>,
Yang Jihong <yangjihong1@...wei.com>,
Ming Wang <wangming01@...ngson.cn>,
James Clark <james.clark@....com>,
K Prateek Nayak <kprateek.nayak@....com>,
Sean Christopherson <seanjc@...gle.com>,
Leo Yan <leo.yan@...aro.org>,
Ravi Bangoria <ravi.bangoria@....com>,
German Gomez <german.gomez@....com>,
Changbin Du <changbin.du@...wei.com>,
Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
Sandipan Das <sandipan.das@....com>,
liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org,
Guilherme Amadio <amadio@...too.org>
Subject: [PATCH v6 02/47] perf maps: Add maps__for_each_map to iterate maps
holding the lock
The macro maps__for_each_entry is error prone as it doesn't require
holding the maps lock. Add a new function that iterates the maps
holding the read lock. Convert maps__find_symbol_by_name and
maps__fprintf to use callbacks, the latter being an example of where
the read lock wasn't being held.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/util/maps.c | 99 ++++++++++++++++++++++++++++--------------
tools/perf/util/maps.h | 3 ++
2 files changed, 69 insertions(+), 33 deletions(-)
diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c
index 9a011aed4b75..160a6dce54bb 100644
--- a/tools/perf/util/maps.c
+++ b/tools/perf/util/maps.c
@@ -196,6 +196,21 @@ void maps__put(struct maps *maps)
RC_CHK_PUT(maps);
}
+int maps__for_each_map(struct maps *maps, int (*cb)(struct map *map, void *data), void *data)
+{
+ struct map_rb_node *pos;
+ int ret = 0;
+
+ down_read(maps__lock(maps));
+ maps__for_each_entry(maps, pos) {
+ ret = cb(pos->map, data);
+ if (ret)
+ break;
+ }
+ up_read(maps__lock(maps));
+ return ret;
+}
+
struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
{
struct map *map = maps__find(maps, addr);
@@ -210,31 +225,40 @@ struct symbol *maps__find_symbol(struct maps *maps, u64 addr, struct map **mapp)
return NULL;
}
-struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
-{
+struct maps__find_symbol_by_name_args {
+ struct map **mapp;
+ const char *name;
struct symbol *sym;
- struct map_rb_node *pos;
+};
- down_read(maps__lock(maps));
+static int maps__find_symbol_by_name_cb(struct map *map, void *data)
+{
+ struct maps__find_symbol_by_name_args *args = data;
- maps__for_each_entry(maps, pos) {
- sym = map__find_symbol_by_name(pos->map, name);
+ args->sym = map__find_symbol_by_name(map, args->name);
+ if (!args->sym)
+ return 0;
- if (sym == NULL)
- continue;
- if (!map__contains_symbol(pos->map, sym)) {
- sym = NULL;
- continue;
- }
- if (mapp != NULL)
- *mapp = pos->map;
- goto out;
+ if (!map__contains_symbol(map, args->sym)) {
+ args->sym = NULL;
+ return 0;
}
- sym = NULL;
-out:
- up_read(maps__lock(maps));
- return sym;
+ if (args->mapp != NULL)
+ *args->mapp = map__get(map);
+ return 1;
+}
+
+struct symbol *maps__find_symbol_by_name(struct maps *maps, const char *name, struct map **mapp)
+{
+ struct maps__find_symbol_by_name_args args = {
+ .mapp = mapp,
+ .name = name,
+ .sym = NULL,
+ };
+
+ maps__for_each_map(maps, maps__find_symbol_by_name_cb, &args);
+ return args.sym;
}
int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
@@ -253,25 +277,34 @@ int maps__find_ams(struct maps *maps, struct addr_map_symbol *ams)
return ams->ms.sym ? 0 : -1;
}
-size_t maps__fprintf(struct maps *maps, FILE *fp)
-{
- size_t printed = 0;
- struct map_rb_node *pos;
+struct maps__fprintf_args {
+ FILE *fp;
+ size_t printed;
+};
- down_read(maps__lock(maps));
+static int maps__fprintf_cb(struct map *map, void *data)
+{
+ struct maps__fprintf_args *args = data;
- maps__for_each_entry(maps, pos) {
- printed += fprintf(fp, "Map:");
- printed += map__fprintf(pos->map, fp);
- if (verbose > 2) {
- printed += dso__fprintf(map__dso(pos->map), fp);
- printed += fprintf(fp, "--\n");
- }
+ args->printed += fprintf(args->fp, "Map:");
+ args->printed += map__fprintf(map, args->fp);
+ if (verbose > 2) {
+ args->printed += dso__fprintf(map__dso(map), args->fp);
+ args->printed += fprintf(args->fp, "--\n");
}
+ return 0;
+}
- up_read(maps__lock(maps));
+size_t maps__fprintf(struct maps *maps, FILE *fp)
+{
+ struct maps__fprintf_args args = {
+ .fp = fp,
+ .printed = 0,
+ };
+
+ maps__for_each_map(maps, maps__fprintf_cb, &args);
- return printed;
+ return args.printed;
}
int maps__fixup_overlappings(struct maps *maps, struct map *map, FILE *fp)
diff --git a/tools/perf/util/maps.h b/tools/perf/util/maps.h
index a689149be8c4..14ad95979257 100644
--- a/tools/perf/util/maps.h
+++ b/tools/perf/util/maps.h
@@ -81,6 +81,9 @@ static inline void __maps__zput(struct maps **map)
#define maps__zput(map) __maps__zput(&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);
+
static inline struct rb_root *maps__entries(struct maps *maps)
{
return &RC_CHK_ACCESS(maps)->entries;
--
2.43.0.rc2.451.g8631bc7472-goog
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