Commit 6cff0e8d authored by Kirill Smelkov's avatar Kirill Smelkov Committed by Ingo Molnar
Browse files

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: default avatarKirill Smelkov <kirr@landau.phys.spbu.ru>
Signed-off-by: default avatarArnaldo 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: default avatarIngo Molnar <mingo@elte.hu>
parent 7a2b6209

tools/perf/Documentation/perf-top.txt

+1 −1
Original line number Diff line number Diff line
@@ -74,7 +74,7 @@ OPTIONS 


-s <symbol>::

--sym-annotate=<symbol>::

        Annotate this symbol.  Requires -k option.

        Annotate this symbol.



-v::

--verbose::

tools/perf/builtin-top.c

+23 −16
Original line number Diff line number Diff line
@@ -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");

	}



	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.

	 */

CRA Git | Maintained and supported by SUSTech CRA and CCSE