Merge tag 'perf-core-for-mingo-20160511' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

User visible changes:

- Fix symbol insertion and callchain behavior in db-export (Chris Phlipot)

Infrastructure changes:

- Add libunwind build test (feature query), working towards supporting
  cross-platform DWARF callchains, starting with arm/arm64 (He Kuang)

- Use lsdir() more extensively (Masami Hiramatsu)

- Use SBUILD_ID_SIZE in places where the equivalent expression was
  being used (Masami Hiramatsu)

- Split some more 'perf trace' syscall arg beautifiers (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

21 files changed, 306 insertions, 138 deletions

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 9f878619077a..57c8f98874e8 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -49,6 +49,10 @@ FEATURE_TESTS_BASIC :=			\
 	libslang			\
 	libcrypto			\
 	libunwind			\
+	libunwind-x86			\
+	libunwind-x86_64		\
+	libunwind-arm			\
+	libunwind-aarch64		\
 	pthread-attr-setaffinity-np	\
 	stackprotector-all		\
 	timerfd				\
@@ -69,7 +73,9 @@ FEATURE_TESTS_EXTRA :=			\
 	libbabeltrace			\
 	liberty				\
 	liberty-z			\
-	libunwind-debug-frame
+	libunwind-debug-frame		\
+	libunwind-debug-frame-arm	\
+	libunwind-debug-frame-aarch64
 
 FEATURE_TESTS ?= $(FEATURE_TESTS_BASIC)
 
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 4ae94dbfdab9..3d88f09e188b 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -27,6 +27,12 @@ FILES=					\
 	test-libcrypto.bin		\
 	test-libunwind.bin		\
 	test-libunwind-debug-frame.bin	\
+	test-libunwind-x86.bin		\
+	test-libunwind-x86_64.bin	\
+	test-libunwind-arm.bin		\
+	test-libunwind-aarch64.bin	\
+	test-libunwind-debug-frame-arm.bin	\
+	test-libunwind-debug-frame-aarch64.bin	\
 	test-pthread-attr-setaffinity-np.bin	\
 	test-stackprotector-all.bin	\
 	test-timerfd.bin		\
@@ -103,6 +109,23 @@ $(OUTPUT)test-libunwind.bin:
 
 $(OUTPUT)test-libunwind-debug-frame.bin:
 	$(BUILD) -lelf
+$(OUTPUT)test-libunwind-x86.bin:
+	$(BUILD) -lelf -lunwind-x86
+
+$(OUTPUT)test-libunwind-x86_64.bin:
+	$(BUILD) -lelf -lunwind-x86_64
+
+$(OUTPUT)test-libunwind-arm.bin:
+	$(BUILD) -lelf -lunwind-arm
+
+$(OUTPUT)test-libunwind-aarch64.bin:
+	$(BUILD) -lelf -lunwind-aarch64
+
+$(OUTPUT)test-libunwind-debug-frame-arm.bin:
+	$(BUILD) -lelf -lunwind-arm
+
+$(OUTPUT)test-libunwind-debug-frame-aarch64.bin:
+	$(BUILD) -lelf -lunwind-aarch64
 
 $(OUTPUT)test-libaudit.bin:
 	$(BUILD) -laudit
diff --git a/tools/build/feature/test-libunwind-aarch64.c b/tools/build/feature/test-libunwind-aarch64.c
new file mode 100644
index 000000000000..fc03fb64e8c1
--- /dev/null
+++ b/tools/build/feature/test-libunwind-aarch64.c
@@ -0,0 +1,26 @@
+#include <libunwind-aarch64.h>
+#include <stdlib.h>
+
+extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+					       unw_word_t ip,
+					       unw_dyn_info_t *di,
+					       unw_proc_info_t *pi,
+					       int need_unwind_info, void *arg);
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+static unw_accessors_t accessors;
+
+int main(void)
+{
+	unw_addr_space_t addr_space;
+
+	addr_space = unw_create_addr_space(&accessors, 0);
+	if (addr_space)
+		return 0;
+
+	unw_init_remote(NULL, addr_space, NULL);
+	dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);
+
+	return 0;
+}
diff --git a/tools/build/feature/test-libunwind-arm.c b/tools/build/feature/test-libunwind-arm.c
new file mode 100644
index 000000000000..632d95ec641f
--- /dev/null
+++ b/tools/build/feature/test-libunwind-arm.c
@@ -0,0 +1,27 @@
+#include <libunwind-arm.h>
+#include <stdlib.h>
+
+extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+					       unw_word_t ip,
+					       unw_dyn_info_t *di,
+					       unw_proc_info_t *pi,
+					       int need_unwind_info, void *arg);
+
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+static unw_accessors_t accessors;
+
+int main(void)
+{
+	unw_addr_space_t addr_space;
+
+	addr_space = unw_create_addr_space(&accessors, 0);
+	if (addr_space)
+		return 0;
+
+	unw_init_remote(NULL, addr_space, NULL);
+	dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);
+
+	return 0;
+}
diff --git a/tools/build/feature/test-libunwind-debug-frame-aarch64.c b/tools/build/feature/test-libunwind-debug-frame-aarch64.c
new file mode 100644
index 000000000000..22844673fc26
--- /dev/null
+++ b/tools/build/feature/test-libunwind-debug-frame-aarch64.c
@@ -0,0 +1,16 @@
+#include <libunwind-aarch64.h>
+#include <stdlib.h>
+
+extern int
+UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
+				 unw_word_t ip, unw_word_t segbase,
+				 const char *obj_name, unw_word_t start,
+				 unw_word_t end);
+
+#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)
+
+int main(void)
+{
+	dwarf_find_debug_frame(0, NULL, 0, 0, NULL, 0, 0);
+	return 0;
+}
diff --git a/tools/build/feature/test-libunwind-debug-frame-arm.c b/tools/build/feature/test-libunwind-debug-frame-arm.c
new file mode 100644
index 000000000000..f98859684fee
--- /dev/null
+++ b/tools/build/feature/test-libunwind-debug-frame-arm.c
@@ -0,0 +1,16 @@
+#include <libunwind-arm.h>
+#include <stdlib.h>
+
+extern int
+UNW_OBJ(dwarf_find_debug_frame) (int found, unw_dyn_info_t *di_debug,
+				 unw_word_t ip, unw_word_t segbase,
+				 const char *obj_name, unw_word_t start,
+				 unw_word_t end);
+
+#define dwarf_find_debug_frame UNW_OBJ(dwarf_find_debug_frame)
+
+int main(void)
+{
+	dwarf_find_debug_frame(0, NULL, 0, 0, NULL, 0, 0);
+	return 0;
+}
diff --git a/tools/build/feature/test-libunwind-x86.c b/tools/build/feature/test-libunwind-x86.c
new file mode 100644
index 000000000000..3561edce305e
--- /dev/null
+++ b/tools/build/feature/test-libunwind-x86.c
@@ -0,0 +1,27 @@
+#include <libunwind-x86.h>
+#include <stdlib.h>
+
+extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+					       unw_word_t ip,
+					       unw_dyn_info_t *di,
+					       unw_proc_info_t *pi,
+					       int need_unwind_info, void *arg);
+
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+static unw_accessors_t accessors;
+
+int main(void)
+{
+	unw_addr_space_t addr_space;
+
+	addr_space = unw_create_addr_space(&accessors, 0);
+	if (addr_space)
+		return 0;
+
+	unw_init_remote(NULL, addr_space, NULL);
+	dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);
+
+	return 0;
+}
diff --git a/tools/build/feature/test-libunwind-x86_64.c b/tools/build/feature/test-libunwind-x86_64.c
new file mode 100644
index 000000000000..5add2517b2a1
--- /dev/null
+++ b/tools/build/feature/test-libunwind-x86_64.c
@@ -0,0 +1,27 @@
+#include <libunwind-x86_64.h>
+#include <stdlib.h>
+
+extern int UNW_OBJ(dwarf_search_unwind_table) (unw_addr_space_t as,
+					       unw_word_t ip,
+					       unw_dyn_info_t *di,
+					       unw_proc_info_t *pi,
+					       int need_unwind_info, void *arg);
+
+
+#define dwarf_search_unwind_table UNW_OBJ(dwarf_search_unwind_table)
+
+static unw_accessors_t accessors;
+
+int main(void)
+{
+	unw_addr_space_t addr_space;
+
+	addr_space = unw_create_addr_space(&accessors, 0);
+	if (addr_space)
+		return 0;
+
+	unw_init_remote(NULL, addr_space, NULL);
+	dwarf_search_unwind_table(addr_space, 0, NULL, NULL, 0, NULL);
+
+	return 0;
+}
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 709963740f9a..6e5c325148e4 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -41,7 +41,6 @@
 #include <libaudit.h> /* FIXME: Still needed for audit_errno_to_name */
 #include <stdlib.h>
 #include <linux/err.h>
-#include <linux/seccomp.h>
 #include <linux/filter.h>
 #include <linux/audit.h>
 #include <sys/ptrace.h>
@@ -369,37 +368,6 @@ static size_t syscall_arg__scnprintf_int(char *bf, size_t size,
 
 #define SCA_INT syscall_arg__scnprintf_int
 
-static size_t syscall_arg__scnprintf_flock(char *bf, size_t size,
-					   struct syscall_arg *arg)
-{
-	int printed = 0, op = arg->val;
-
-	if (op == 0)
-		return scnprintf(bf, size, "NONE");
-#define	P_CMD(cmd) \
-	if ((op & LOCK_##cmd) == LOCK_##cmd) { \
-		printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #cmd); \
-		op &= ~LOCK_##cmd; \
-	}
-
-	P_CMD(SH);
-	P_CMD(EX);
-	P_CMD(NB);
-	P_CMD(UN);
-	P_CMD(MAND);
-	P_CMD(RW);
-	P_CMD(READ);
-	P_CMD(WRITE);
-#undef P_OP
-
-	if (op)
-		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", op);
-
-	return printed;
-}
-
-#define SCA_FLOCK syscall_arg__scnprintf_flock
-
 static const char *bpf_cmd[] = {
 	"MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
 	"MAP_GET_NEXT_KEY", "PROG_LOAD",
@@ -548,57 +516,6 @@ static const char *tioctls[] = {
 static DEFINE_STRARRAY_OFFSET(tioctls, 0x5401);
 #endif /* defined(__i386__) || defined(__x86_64__) */
 
-#ifndef SECCOMP_SET_MODE_STRICT
-#define SECCOMP_SET_MODE_STRICT 0
-#endif
-#ifndef SECCOMP_SET_MODE_FILTER
-#define SECCOMP_SET_MODE_FILTER 1
-#endif
-
-static size_t syscall_arg__scnprintf_seccomp_op(char *bf, size_t size, struct syscall_arg *arg)
-{
-	int op = arg->val;
-	size_t printed = 0;
-
-	switch (op) {
-#define	P_SECCOMP_SET_MODE_OP(n) case SECCOMP_SET_MODE_##n: printed = scnprintf(bf, size, #n); break
-	P_SECCOMP_SET_MODE_OP(STRICT);
-	P_SECCOMP_SET_MODE_OP(FILTER);
-#undef P_SECCOMP_SET_MODE_OP
-	default: printed = scnprintf(bf, size, "%#x", op);			  break;
-	}
-
-	return printed;
-}
-
-#define SCA_SECCOMP_OP  syscall_arg__scnprintf_seccomp_op
-
-#ifndef SECCOMP_FILTER_FLAG_TSYNC
-#define SECCOMP_FILTER_FLAG_TSYNC 1
-#endif
-
-static size_t syscall_arg__scnprintf_seccomp_flags(char *bf, size_t size,
-						   struct syscall_arg *arg)
-{
-	int printed = 0, flags = arg->val;
-
-#define	P_FLAG(n) \
-	if (flags & SECCOMP_FILTER_FLAG_##n) { \
-		printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
-		flags &= ~SECCOMP_FILTER_FLAG_##n; \
-	}
-
-	P_FLAG(TSYNC);
-#undef P_FLAG
-
-	if (flags)
-		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
-
-	return printed;
-}
-
-#define SCA_SECCOMP_FLAGS syscall_arg__scnprintf_seccomp_flags
-
 #ifndef GRND_NONBLOCK
 #define GRND_NONBLOCK	0x0001
 #endif
@@ -634,6 +551,7 @@ static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
 	  .arg_parm	 = { [arg] = &strarray__##array, }
 
 #include "trace/beauty/eventfd.c"
+#include "trace/beauty/flock.c"
 #include "trace/beauty/futex_op.c"
 #include "trace/beauty/mmap.c"
 #include "trace/beauty/mode_t.c"
@@ -642,6 +560,7 @@ static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
 #include "trace/beauty/perf_event_open.c"
 #include "trace/beauty/pid.c"
 #include "trace/beauty/sched_policy.c"
+#include "trace/beauty/seccomp.c"
 #include "trace/beauty/signum.c"
 #include "trace/beauty/socket_type.c"
 #include "trace/beauty/waitid_options.c"
diff --git a/tools/perf/trace/beauty/flock.c b/tools/perf/trace/beauty/flock.c
new file mode 100644
index 000000000000..021bb48c6336
--- /dev/null
+++ b/tools/perf/trace/beauty/flock.c
@@ -0,0 +1,31 @@
+
+static size_t syscall_arg__scnprintf_flock(char *bf, size_t size,
+					   struct syscall_arg *arg)
+{
+	int printed = 0, op = arg->val;
+
+	if (op == 0)
+		return scnprintf(bf, size, "NONE");
+#define	P_CMD(cmd) \
+	if ((op & LOCK_##cmd) == LOCK_##cmd) { \
+		printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #cmd); \
+		op &= ~LOCK_##cmd; \
+	}
+
+	P_CMD(SH);
+	P_CMD(EX);
+	P_CMD(NB);
+	P_CMD(UN);
+	P_CMD(MAND);
+	P_CMD(RW);
+	P_CMD(READ);
+	P_CMD(WRITE);
+#undef P_OP
+
+	if (op)
+		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", op);
+
+	return printed;
+}
+
+#define SCA_FLOCK syscall_arg__scnprintf_flock
diff --git a/tools/perf/trace/beauty/seccomp.c b/tools/perf/trace/beauty/seccomp.c
new file mode 100644
index 000000000000..213c5a7e3e92
--- /dev/null
+++ b/tools/perf/trace/beauty/seccomp.c
@@ -0,0 +1,52 @@
+#include <linux/seccomp.h>
+
+#ifndef SECCOMP_SET_MODE_STRICT
+#define SECCOMP_SET_MODE_STRICT 0
+#endif
+#ifndef SECCOMP_SET_MODE_FILTER
+#define SECCOMP_SET_MODE_FILTER 1
+#endif
+
+static size_t syscall_arg__scnprintf_seccomp_op(char *bf, size_t size, struct syscall_arg *arg)
+{
+	int op = arg->val;
+	size_t printed = 0;
+
+	switch (op) {
+#define	P_SECCOMP_SET_MODE_OP(n) case SECCOMP_SET_MODE_##n: printed = scnprintf(bf, size, #n); break
+	P_SECCOMP_SET_MODE_OP(STRICT);
+	P_SECCOMP_SET_MODE_OP(FILTER);
+#undef P_SECCOMP_SET_MODE_OP
+	default: printed = scnprintf(bf, size, "%#x", op);			  break;
+	}
+
+	return printed;
+}
+
+#define SCA_SECCOMP_OP  syscall_arg__scnprintf_seccomp_op
+
+#ifndef SECCOMP_FILTER_FLAG_TSYNC
+#define SECCOMP_FILTER_FLAG_TSYNC 1
+#endif
+
+static size_t syscall_arg__scnprintf_seccomp_flags(char *bf, size_t size,
+						   struct syscall_arg *arg)
+{
+	int printed = 0, flags = arg->val;
+
+#define	P_FLAG(n) \
+	if (flags & SECCOMP_FILTER_FLAG_##n) { \
+		printed += scnprintf(bf + printed, size - printed, "%s%s", printed ? "|" : "", #n); \
+		flags &= ~SECCOMP_FILTER_FLAG_##n; \
+	}
+
+	P_FLAG(TSYNC);
+#undef P_FLAG
+
+	if (flags)
+		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
+
+	return printed;
+}
+
+#define SCA_SECCOMP_FLAGS syscall_arg__scnprintf_seccomp_flags
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index d4b3d034c503..4db73d5a0dbc 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1138,7 +1138,7 @@ fallback:
 
 	if (dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS &&
 	    !dso__is_kcore(dso)) {
-		char bf[BUILD_ID_SIZE * 2 + 16] = " with build id ";
+		char bf[SBUILD_ID_SIZE + 15] = " with build id ";
 		char *build_id_msg = NULL;
 
 		if (dso->annotate_warned)
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index b6ecf87bc3e3..bff425e1232c 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -365,39 +365,17 @@ static char *build_id_cache__dirname_from_path(const char *name,
 int build_id_cache__list_build_ids(const char *pathname,
 				   struct strlist **result)
 {
-	struct strlist *list;
 	char *dir_name;
-	DIR *dir;
-	struct dirent *d;
 	int ret = 0;
 
-	list = strlist__new(NULL, NULL);
 	dir_name = build_id_cache__dirname_from_path(pathname, false, false);
-	if (!list || !dir_name) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (!dir_name)
+		return -ENOMEM;
 
-	/* List up all dirents */
-	dir = opendir(dir_name);
-	if (!dir) {
+	*result = lsdir(dir_name, lsdir_no_dot_filter);
+	if (!*result)
 		ret = -errno;
-		goto out;
-	}
-
-	while ((d = readdir(dir)) != NULL) {
-		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
-			continue;
-		strlist__add(list, d->d_name);
-	}
-	closedir(dir);
-
-out:
 	free(dir_name);
-	if (ret)
-		strlist__delete(list);
-	else
-		*result = list;
 
 	return ret;
 }
diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index f8e3057ae3b1..8d96c80cc67e 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -260,8 +260,7 @@ static int db_ids_from_al(struct db_export *dbe, struct addr_location *al,
 		if (!al->sym) {
 			al->sym = symbol__new(al->addr, 0, 0, "unknown");
 			if (al->sym)
-				symbols__insert(&dso->symbols[al->map->type],
-						al->sym);
+				dso__insert_symbol(dso, al->map->type, al->sym);
 		}
 
 		if (al->sym) {
@@ -325,10 +324,11 @@ static struct call_path *call_path_from_sample(struct db_export *dbe,
 		al.sym = node->sym;
 		al.map = node->map;
 		al.machine = machine;
-		if (al.map)
-			al.addr = al.map->map_ip(al.map, node->ip);
-		else
-			al.addr = node->ip;
+		al.addr = node->ip;
+
+		if (al.map && !al.sym)
+			al.sym = dso__find_symbol(al.map->dso, MAP__FUNCTION,
+						  al.addr);
 
 		db_ids_from_al(dbe, &al, &dso_db_id, &sym_db_id, &offset);
 
diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 8e6395439ca0..3357479082ca 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -38,7 +38,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
 				   enum dso_binary_type type,
 				   char *root_dir, char *filename, size_t size)
 {
-	char build_id_hex[BUILD_ID_SIZE * 2 + 1];
+	char build_id_hex[SBUILD_ID_SIZE];
 	int ret = 0;
 	size_t len;
 
@@ -1301,7 +1301,7 @@ size_t __dsos__fprintf(struct list_head *head, FILE *fp)
 
 size_t dso__fprintf_buildid(struct dso *dso, FILE *fp)
 {
-	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+	char sbuild_id[SBUILD_ID_SIZE];
 
 	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
 	return fprintf(fp, "%s", sbuild_id);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index c6000d44f98c..08852dde1378 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1474,7 +1474,7 @@ static int __event_process_build_id(struct build_id_event *bev,
 
 	dso = machine__findnew_dso(machine, filename);
 	if (dso != NULL) {
-		char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+		char sbuild_id[SBUILD_ID_SIZE];
 
 		dso__set_build_id(dso, &bev->build_id);
 
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 02c31865648b..b19bcd3b7128 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -289,7 +289,7 @@ int map__load(struct map *map, symbol_filter_t filter)
 	nr = dso__load(map->dso, map, filter);
 	if (nr < 0) {
 		if (map->dso->has_build_id) {
-			char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+			char sbuild_id[SBUILD_ID_SIZE];
 
 			build_id__sprintf(map->dso->build_id,
 					  sizeof(map->dso->build_id),
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index 1546b749a3a3..ff134700bf30 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -408,8 +408,11 @@ static void python_process_tracepoint(struct perf_sample *sample,
 	if (!t)
 		Py_FatalError("couldn't create Python tuple");
 
-	if (!event)
-		die("ug! no event found for type %d", (int)evsel->attr.config);
+	if (!event) {
+		snprintf(handler_name, sizeof(handler_name),
+			 "ug! no event found for type %" PRIu64, (u64)evsel->attr.config);
+		Py_FatalError(handler_name);
+	}
 
 	pid = raw_field_value(event, "common_pid", data);
 
@@ -615,7 +618,7 @@ static int python_export_dso(struct db_export *dbe, struct dso *dso,
 			     struct machine *machine)
 {
 	struct tables *tables = container_of(dbe, struct tables, dbe);
-	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+	char sbuild_id[SBUILD_ID_SIZE];
 	PyObject *t;
 
 	build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 2946295ca502..7fb33304fb4e 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -413,6 +413,18 @@ void dso__reset_find_symbol_cache(struct dso *dso)
 	}
 }
 
+void dso__insert_symbol(struct dso *dso, enum map_type type, struct symbol *sym)
+{
+	symbols__insert(&dso->symbols[type], sym);
+
+	/* update the symbol cache if necessary */
+	if (dso->last_find_result[type].addr >= sym->start &&
+	    (dso->last_find_result[type].addr < sym->end ||
+	    sym->start == sym->end)) {
+		dso->last_find_result[type].symbol = sym;
+	}
+}
+
 struct symbol *dso__find_symbol(struct dso *dso,
 				enum map_type type, u64 addr)
 {
@@ -1596,25 +1608,27 @@ out:
 	return err;
 }
 
+static bool visible_dir_filter(const char *name, struct dirent *d)
+{
+	if (d->d_type != DT_DIR)
+		return false;
+	return lsdir_no_dot_filter(name, d);
+}
+
 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
 {
 	char kallsyms_filename[PATH_MAX];
-	struct dirent *dent;
 	int ret = -1;
-	DIR *d;
+	struct strlist *dirs;
+	struct str_node *nd;
 
-	d = opendir(dir);
-	if (!d)
+	dirs = lsdir(dir, visible_dir_filter);
+	if (!dirs)
 		return -1;
 
-	while (1) {
-		dent = readdir(d);
-		if (!dent)
-			break;
-		if (dent->d_type != DT_DIR)
-			continue;
+	strlist__for_each(nd, dirs) {
 		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
-			  "%s/%s/kallsyms", dir, dent->d_name);
+			  "%s/%s/kallsyms", dir, nd->s);
 		if (!validate_kcore_addresses(kallsyms_filename, map)) {
 			strlcpy(dir, kallsyms_filename, dir_sz);
 			ret = 0;
@@ -1622,7 +1636,7 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
 		}
 	}
 
-	closedir(d);
+	strlist__delete(dirs);
 
 	return ret;
 }
@@ -1630,7 +1644,7 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
 static char *dso__find_kallsyms(struct dso *dso, struct map *map)
 {
 	u8 host_build_id[BUILD_ID_SIZE];
-	char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+	char sbuild_id[SBUILD_ID_SIZE];
 	bool is_host = false;
 	char path[PATH_MAX];
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 07211c2f8456..2b5e4ed76fcb 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -246,6 +246,9 @@ int __dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
 int dso__load_kallsyms(struct dso *dso, const char *filename, struct map *map,
 		       symbol_filter_t filter);
 
+void dso__insert_symbol(struct dso *dso, enum map_type type,
+			struct symbol *sym);
+
 struct symbol *dso__find_symbol(struct dso *dso, enum map_type type,
 				u64 addr);
 struct symbol *dso__find_symbol_by_name(struct dso *dso, enum map_type type,
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 01c9433de7ef..eab077ad6ca9 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -139,7 +139,7 @@ struct strlist *lsdir(const char *name,
 
 	list = strlist__new(NULL, NULL);
 	if (!list) {
-		errno = -ENOMEM;
+		errno = ENOMEM;
 		goto out;
 	}