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Subject[PATCH 1/6] perf top: teach it to autolocate vmlinux
Date
By relying on logic in dso__load_kernel_sym(), we can automatically load
vmlinux.

The only thing which needs to be adjusted, is how --sym-annotate option
is handled - now we can't rely on vmlinux been loaded until full
successful pass of dso__load_vmlinux(), but that's not the case if we'll
do sym_filter_entry setup in symbol_filter().

So move this step right after event__process_sample() where we know the
whole dso__load_kernel_sym() pass is done.

By the way, though conceptually similar `perf top` still can't annotate
userspace - see next patches with fixes.

Signed-off-by: Kirill Smelkov <kirr@landau.phys.spbu.ru>
Cc: Mike Galbraith <efault@gmx.de>
---
tools/perf/Documentation/perf-top.txt | 2 +-
tools/perf/builtin-top.c | 39 +++++++++++++++++++-------------
2 files changed, 24 insertions(+), 17 deletions(-)
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index 4a7d558..785b9fc 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -74,7 +74,7 @@ OPTIONS

-s <symbol>::
--sym-annotate=<symbol>::
- Annotate this symbol. Requires -k option.
+ Annotate this symbol.

-v::
--verbose::
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index ddc584b..9c7de93 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -94,6 +94,7 @@ struct source_line {

static char *sym_filter = NULL;
struct sym_entry *sym_filter_entry = NULL;
+struct sym_entry *sym_filter_entry_sched = NULL;
static int sym_pcnt_filter = 5;
static int sym_counter = 0;
static int display_weighted = -1;
@@ -695,11 +696,9 @@ static void print_mapped_keys(void)

fprintf(stdout, "\t[f] profile display filter (count). \t(%d)\n", count_filter);

- if (symbol_conf.vmlinux_name) {
- fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
- fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
- fprintf(stdout, "\t[S] stop annotation.\n");
- }
+ fprintf(stdout, "\t[F] annotate display filter (percent). \t(%d%%)\n", sym_pcnt_filter);
+ fprintf(stdout, "\t[s] annotate symbol. \t(%s)\n", name?: "NULL");
+ fprintf(stdout, "\t[S] stop annotation.\n");

if (nr_counters > 1)
fprintf(stdout, "\t[w] toggle display weighted/count[E]r. \t(%d)\n", display_weighted ? 1 : 0);
@@ -725,14 +724,13 @@ static int key_mapped(int c)
case 'Q':
case 'K':
case 'U':
+ case 'F':
+ case 's':
+ case 'S':
return 1;
case 'E':
case 'w':
return nr_counters > 1 ? 1 : 0;
- case 'F':
- case 's':
- case 'S':
- return symbol_conf.vmlinux_name ? 1 : 0;
default:
break;
}
@@ -910,8 +908,12 @@ static int symbol_filter(struct map *map, struct symbol *sym)
syme = symbol__priv(sym);
syme->map = map;
syme->src = NULL;
- if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter))
- sym_filter_entry = syme;
+
+ if (!sym_filter_entry && sym_filter && !strcmp(name, sym_filter)) {
+ /* schedule initial sym_filter_entry setup */
+ sym_filter_entry_sched = syme;
+ sym_filter = NULL;
+ }

for (i = 0; skip_symbols[i]; i++) {
if (!strcmp(skip_symbols[i], name)) {
@@ -951,6 +953,13 @@ static void event__process_sample(const event_t *self,
al.sym == NULL || al.filtered)
return;

+ /* let's see, whether we need to install initial sym_filter_entry */
+ if (sym_filter_entry_sched) {
+ sym_filter_entry = sym_filter_entry_sched;
+ sym_filter_entry_sched = NULL;
+ parse_source(sym_filter_entry);
+ }
+
syme = symbol__priv(al.sym);
if (!syme->skip) {
syme->count[counter]++;
@@ -1244,7 +1253,7 @@ static const struct option options[] = {
OPT_BOOLEAN('i', "inherit", &inherit,
"child tasks inherit counters"),
OPT_STRING('s', "sym-annotate", &sym_filter, "symbol name",
- "symbol to annotate - requires -k option"),
+ "symbol to annotate"),
OPT_BOOLEAN('z', "zero", &zero,
"zero history across updates"),
OPT_INTEGER('F', "freq", &freq,
@@ -1280,16 +1289,14 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)

symbol_conf.priv_size = (sizeof(struct sym_entry) +
(nr_counters + 1) * sizeof(unsigned long));
- if (symbol_conf.vmlinux_name == NULL)
- symbol_conf.try_vmlinux_path = true;
+
+ symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
if (symbol__init() < 0)
return -1;

if (delay_secs < 1)
delay_secs = 1;

- parse_source(sym_filter_entry);
-
/*
* User specified count overrides default frequency.
*/
--
1.6.6.79.gd514e.dirty

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