perf thread: Make thread__find_map() search all maps

tip:perf/core tip-bot for Arnaldo Carvalho de Melo 1 participant 1 message May 2, 2018 perf events

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2018-05-02 17:57 UTC #0 lore raw

Commit-ID:  404eb5a436c4cbdc3b76896a28a3b72b7ad9294e
Gitweb:     https://git.kernel.org/tip/404eb5a436c4cbdc3b76896a28a3b72b7ad9294e
Author:     Arnaldo Carvalho de Melo <[email protected]>
AuthorDate: Thu, 26 Apr 2018 09:34:37 -0300
Committer:  Arnaldo Carvalho de Melo <[email protected]>
CommitDate: Thu, 26 Apr 2018 13:47:17 -0300

perf thread: Make thread__find_map() search all maps

We still have the split internally, but users don't see it anymore, simplifying the growing number of cases where we end up searching in the MAP__VARIABLE maps.

This further paves the way for ditching the split.

Cc Adrian Hunter <[email protected]>

Cc David Ahern <[email protected]>

Cc Jiri Olsa <[email protected]>

Cc Namhyung Kim <[email protected]>

Cc Wang Nan <[email protected]>

Link https://lkml.kernel.org/n/[email protected] open here

Signed-off-by Arnaldo Carvalho de Melo <[email protected]>

---
 tools/perf/builtin-script.c              |  4 ++--
 tools/perf/util/event.c                  | 19 +++++++++++--------
 tools/perf/util/thread.h                 | 10 ++--------
 tools/perf/util/unwind-libdw.c           | 10 ----------
 tools/perf/util/unwind-libunwind-local.c | 12 +-----------
 5 files changed, 16 insertions(+), 39 deletions(-)

tools/perf/builtin-script.c +2 -2

index 07cb083ac89c..fa2c7a288750 100644
@@ -927,8 +927,8 @@ static int ip__fprintf_sym(uint64_t addr, struct thread *thread,
 
 	memset(&al, 0, sizeof(al));
 
-	if (!thread__find_map(thread, cpumode, addr, &al))
-		__thread__find_map(thread, cpumode, MAP__VARIABLE, addr, &al);
+	thread__find_map(thread, cpumode, addr, &al);
+
 	if ((*lastsym) && al.addr >= (*lastsym)->start && al.addr < (*lastsym)->end)
 		return 0;

tools/perf/util/event.c +11 -8

index 7b67771cd478..7831c2266118 100644
@@ -1488,8 +1488,8 @@ int perf_event__process(struct perf_tool *tool __maybe_unused,
 	return machine__process_event(machine, event, sample);
 }
 
-struct map *__thread__find_map(struct thread *thread, u8 cpumode, enum map_type type,
-			       u64 addr, struct addr_location *al)
+static struct map *__thread__find_map(struct thread *thread, u8 cpumode, enum map_type type,
+				      u64 addr, struct addr_location *al)
 {
 	struct map_groups *mg = thread->mg;
 	struct machine *machine = mg->machine;

@@ -1565,12 +1565,18 @@ try_again:
 	return al->map;
 }
 
+struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
+			     struct addr_location *al)
+{
+	struct map *map = __thread__find_map(thread, cpumode, MAP__FUNCTION, addr, al);
+	return map ?: __thread__find_map(thread, cpumode, MAP__VARIABLE, addr, al);
+}
+
 struct symbol *thread__find_symbol(struct thread *thread, u8 cpumode,
 				   u64 addr, struct addr_location *al)
 {
 	al->sym = NULL;
-	if (__thread__find_map(thread, cpumode, MAP__FUNCTION, addr, al) ||
-	    __thread__find_map(thread, cpumode, MAP__VARIABLE, addr, al))
+	if (thread__find_map(thread, cpumode, addr, al))
 		al->sym = map__find_symbol(al->map, al->addr);
 	return al->sym;
 }

@@ -1668,10 +1674,7 @@ bool sample_addr_correlates_sym(struct perf_event_attr *attr)
 void thread__resolve(struct thread *thread, struct addr_location *al,
 		     struct perf_sample *sample)
 {
-	if (!thread__find_map(thread, sample->cpumode, sample->addr, al)) {
-		__thread__find_map(thread, sample->cpumode, MAP__VARIABLE,
-				   sample->addr, al);
-	}
+	thread__find_map(thread, sample->cpumode, sample->addr, al);
 
 	al->cpu = sample->cpu;
 	al->sym = NULL;

tools/perf/util/thread.h +2 -8

index 54aa24d6151e..07606aa6998d 100644
@@ -92,14 +92,8 @@ size_t thread__fprintf(struct thread *thread, FILE *fp);
 
 struct thread *thread__main_thread(struct machine *machine, struct thread *thread);
 
-struct map *__thread__find_map(struct thread *thread, u8 cpumode, enum map_type type,
-			       u64 addr, struct addr_location *al);
-
-static inline struct map *thread__find_map(struct thread *thread, u8 cpumode,
-					   u64 addr, struct addr_location *al)
-{
-	return __thread__find_map(thread, cpumode, MAP__FUNCTION, addr, al);
-}
+struct map *thread__find_map(struct thread *thread, u8 cpumode, u64 addr,
+			     struct addr_location *al);
 
 struct symbol *thread__find_symbol(struct thread *thread, u8 cpumode,
 				   u64 addr, struct addr_location *al);

tools/perf/util/unwind-libdw.c +0 ~~-10~~

index 17401922cd42..538db4e5d1e6 100644
@@ -105,16 +105,6 @@ static int access_dso_mem(struct unwind_info *ui, Dwarf_Addr addr,
 	ssize_t size;
 
 	if (!thread__find_map(ui->thread, PERF_RECORD_MISC_USER, addr, &al)) {
-		/*
-		 * We've seen cases (softice) where DWARF unwinder went
-		 * through non executable mmaps, which we need to lookup
-		 * in MAP__VARIABLE tree.
-		 */
-		__thread__find_map(ui->thread, PERF_RECORD_MISC_USER,
-				   MAP__VARIABLE, addr, &al);
-	}
-
-	if (!al.map) {
 		pr_debug("unwind: no map for %lx\n", (unsigned long)addr);
 		return -1;
 	}

tools/perf/util/unwind-libunwind-local.c +1 ~~-11~~

index 2afb22b0a1a9..6a11bc7e6b27 100644
@@ -366,17 +366,7 @@ static int read_unwind_spec_debug_frame(struct dso *dso,
 static struct map *find_map(unw_word_t ip, struct unwind_info *ui)
 {
 	struct addr_location al;
-
-	if (!thread__find_map(ui->thread, PERF_RECORD_MISC_USER, ip, &al)) {
-		/*
-		 * We've seen cases (softice) where DWARF unwinder went
-		 * through non executable mmaps, which we need to lookup
-		 * in MAP__VARIABLE tree.
-		 */
-		__thread__find_map(ui->thread, PERF_RECORD_MISC_USER,
-				   MAP__VARIABLE, ip, &al);
-	}
-	return al.map;
+	return thread__find_map(ui->thread, PERF_RECORD_MISC_USER, ip, &al);
 }
 
 static int