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Subject[005/200] perf top: Properly notify the user that vmlinux is missing
2.6.34-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arnaldo Carvalho de Melo <acme@redhat.com>

commit b0a9ab62ab96e258a0ddd81d7fe2719c3db36006 upstream.

Before this patch this message would very briefly appear on the
screen and then the screen would get updates only on the top,
for number of interrupts received, etc, but no annotation would
be performed:

[root@doppio linux-2.6-tip]# perf top -s n_tty_write > /tmp/bla
objdump: '[kernel.kallsyms]': No such file

Now this is what the user gets:

[root@doppio linux-2.6-tip]# perf top -s n_tty_write
Can't annotate n_tty_write: No vmlinux file was found in the
path: [0] vmlinux
[1] /boot/vmlinux
[2] /boot/vmlinux-2.6.33-rc5
[3] /lib/modules/2.6.33-rc5/build/vmlinux
[4] /usr/lib/debug/lib/modules/2.6.33-rc5/vmlinux
[root@doppio linux-2.6-tip]#

This bug was introduced when we added automatic search for
vmlinux, before that time the user had to specify a vmlinux
file.

Reported-by: David S. Miller <davem@davemloft.net>
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1268664418-28328-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
tools/perf/builtin-top.c | 33 +++++++++++++++++++++++++--------
tools/perf/util/symbol.c | 25 ++++++++++++-------------
tools/perf/util/symbol.h | 15 +++++++++++++++
3 files changed, 52 insertions(+), 21 deletions(-)

--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -169,7 +169,7 @@ static void sig_winch_handler(int sig __
update_print_entries(&winsize);
}

-static void parse_source(struct sym_entry *syme)
+static int parse_source(struct sym_entry *syme)
{
struct symbol *sym;
struct sym_entry_source *source;
@@ -180,12 +180,21 @@ static void parse_source(struct sym_entr
u64 len;

if (!syme)
- return;
+ return -1;
+
+ sym = sym_entry__symbol(syme);
+ map = syme->map;
+
+ /*
+ * We can't annotate with just /proc/kallsyms
+ */
+ if (map->dso->origin == DSO__ORIG_KERNEL)
+ return -1;

if (syme->src == NULL) {
syme->src = zalloc(sizeof(*source));
if (syme->src == NULL)
- return;
+ return -1;
pthread_mutex_init(&syme->src->lock, NULL);
}

@@ -195,9 +204,6 @@ static void parse_source(struct sym_entr
pthread_mutex_lock(&source->lock);
goto out_assign;
}
-
- sym = sym_entry__symbol(syme);
- map = syme->map;
path = map->dso->long_name;

len = sym->end - sym->start;
@@ -209,7 +215,7 @@ static void parse_source(struct sym_entr

file = popen(command, "r");
if (!file)
- return;
+ return -1;

pthread_mutex_lock(&source->lock);
source->lines_tail = &source->lines;
@@ -245,6 +251,7 @@ static void parse_source(struct sym_entr
out_assign:
sym_filter_entry = syme;
pthread_mutex_unlock(&source->lock);
+ return 0;
}

static void __zero_source_counters(struct sym_entry *syme)
@@ -990,7 +997,17 @@ static void event__process_sample(const
if (sym_filter_entry_sched) {
sym_filter_entry = sym_filter_entry_sched;
sym_filter_entry_sched = NULL;
- parse_source(sym_filter_entry);
+ if (parse_source(sym_filter_entry) < 0) {
+ struct symbol *sym = sym_entry__symbol(sym_filter_entry);
+
+ pr_err("Can't annotate %s", sym->name);
+ if (sym_filter_entry->map->dso->origin == DSO__ORIG_KERNEL) {
+ pr_err(": No vmlinux file was found in the path:\n");
+ vmlinux_path__fprintf(stderr);
+ } else
+ pr_err(".\n");
+ exit(1);
+ }
}

syme = symbol__priv(al.sym);
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -18,18 +18,6 @@
#define NT_GNU_BUILD_ID 3
#endif

-enum dso_origin {
- DSO__ORIG_KERNEL = 0,
- DSO__ORIG_JAVA_JIT,
- DSO__ORIG_BUILD_ID_CACHE,
- DSO__ORIG_FEDORA,
- DSO__ORIG_UBUNTU,
- DSO__ORIG_BUILDID,
- DSO__ORIG_DSO,
- DSO__ORIG_KMODULE,
- DSO__ORIG_NOT_FOUND,
-};
-
static void dsos__add(struct list_head *head, struct dso *dso);
static struct map *map__new2(u64 start, struct dso *dso, enum map_type type);
static int dso__load_kernel_sym(struct dso *self, struct map *map,
@@ -1025,7 +1013,7 @@ static int dso__load_sym(struct dso *sel
}
curr_map->map_ip = identity__map_ip;
curr_map->unmap_ip = identity__map_ip;
- curr_dso->origin = DSO__ORIG_KERNEL;
+ curr_dso->origin = self->origin;
map_groups__insert(kmap->kmaps, curr_map);
dsos__add(&dsos__kernel, curr_dso);
dso__set_loaded(curr_dso, map->type);
@@ -1895,6 +1883,17 @@ out_fail:
return -1;
}

+size_t vmlinux_path__fprintf(FILE *fp)
+{
+ int i;
+ size_t printed = 0;
+
+ for (i = 0; i < vmlinux_path__nr_entries; ++i)
+ printed += fprintf(fp, "[%d] %s\n", i, vmlinux_path[i]);
+
+ return printed;
+}
+
static int setup_list(struct strlist **list, const char *list_str,
const char *list_name)
{
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -150,6 +150,19 @@ size_t dsos__fprintf_buildid(FILE *fp, b

size_t dso__fprintf_buildid(struct dso *self, FILE *fp);
size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp);
+
+enum dso_origin {
+ DSO__ORIG_KERNEL = 0,
+ DSO__ORIG_JAVA_JIT,
+ DSO__ORIG_BUILD_ID_CACHE,
+ DSO__ORIG_FEDORA,
+ DSO__ORIG_UBUNTU,
+ DSO__ORIG_BUILDID,
+ DSO__ORIG_DSO,
+ DSO__ORIG_KMODULE,
+ DSO__ORIG_NOT_FOUND,
+};
+
char dso__symtab_origin(const struct dso *self);
void dso__set_long_name(struct dso *self, char *name);
void dso__set_build_id(struct dso *self, void *build_id);
@@ -169,4 +182,6 @@ int kallsyms__parse(const char *filename
int symbol__init(void);
bool symbol_type__is_a(char symbol_type, enum map_type map_type);

+size_t vmlinux_path__fprintf(FILE *fp);
+
#endif /* __PERF_SYMBOL */

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