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perf top: Teach it to autolocate vmlinux 

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>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1265223128-11786-9-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Kirill Smelkov 2010-02-03 16:52:08 -02:00 committed by Ingo Molnar
parent 7a2b620986
commit 6cff0e8dba
2 changed files with 24 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/Documentation/perf-top.txt
View File

@ -74,7 +74,7 @@ OPTIONS
-s <symbol>::
--sym-annotate=<symbol>::
Annotate this symbol. Requires -k option.
Annotate this symbol.
-v::
--verbose::

39
tools/perf/builtin-top.c
View File

@ -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)) {
@ -976,6 +978,13 @@ static void event__process_sample(const event_t *self,
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]++;
@ -1270,7 +1279,7 @@ 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,
@ -1306,16 +1315,14 @@ 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.
*/