Commit 94cb9e38 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by Ingo Molnar
Browse files

perf report: Add debug help for the finding of symbol bugs - show the symtab... 


perf report: Add debug help for the finding of symbol bugs - show the symtab origin (DSO, build-id, kernel, etc)

Used with perf report --verbose:

[acme@doppio linux-2.6-tip]$ perf report -v | head -16
     5.17%  firefox  /usr/lib64/xulrunner-1.9.1/libxul.so   0x00000000005d8eee f [.] imgContainer::DrawFrameTo(gfxIImageFrame*, gfxIImageFrame*, nsRect&)
     2.56%  firefox  /lib64/libpthread-2.10.1.so            0x0000000000008e02 d [.] __pthread_mutex_lock_internal
     1.94%  firefox  /usr/lib64/xulrunner-1.9.1/libxul.so   0x0000000000d0af8f f [.] SearchTable
     1.75%  firefox  [kernel]                               0xffffffffff60013b k [.] vread_hpet
     1.63%  firefox  /lib64/libpthread-2.10.1.so            0x000000000000a404 d [.] __pthread_mutex_unlock
     1.47%  firefox  /usr/lib64/xulrunner-1.9.1/libmozjs.so 0x00000000000482ea f [.] js_Interpret
     1.42%  firefox  /usr/lib64/xulrunner-1.9.1/libmozjs.so 0x000000000003eda3 f [.] JS_CallTracer
     1.24%  firefox  [kernel]                               0xffffffff8102ca4a k [k] read_hpet
     1.16%  firefox  [kernel]                               0xffffffff810f3dd4 k [k] fget_light
     1.11%  firefox  /usr/lib64/xulrunner-1.9.1/libmozjs.so 0x00000000000567ff f [.] js_TraceObject
     0.98%  firefox  /usr/lib64/firefox-3.5.2/firefox       0x000000000000dd23 b [.] arena_ralloc
[acme@doppio linux-2.6-tip]$

The new field is just after the symbol address. To help in
figuring out symbol resolution bugs.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 8f18aec5

tools/perf/builtin-report.c

+2 −1
Original line number Diff line number Diff line
@@ -700,7 +700,8 @@ sort__sym_print(FILE *fp, struct hist_entry *self, unsigned int width __used) 
	size_t ret = 0;



	if (verbose)

		ret += repsep_fprintf(fp, "%#018llx  ", (u64)self->ip);

		ret += repsep_fprintf(fp, "%#018llx %c ", (u64)self->ip,

				      dso__symtab_origin(self->dso));



	ret += repsep_fprintf(fp, "[%c] ", self->level);

	if (self->sym) {

tools/perf/util/symbol.c

+46 −11
Original line number Diff line number Diff line
@@ -24,6 +24,16 @@ const char *sym_hist_filter; 
#define DMGL_ANSI        (1 << 1)       /* Include const, volatile, etc */

#endif



enum dso_origin {

	DSO__ORIG_KERNEL = 0,

	DSO__ORIG_JAVA_JIT,

	DSO__ORIG_FEDORA,

	DSO__ORIG_UBUNTU,

	DSO__ORIG_BUILDID,

	DSO__ORIG_DSO,

	DSO__ORIG_NOT_FOUND,

};



static struct symbol *symbol__new(u64 start, u64 len,

				  const char *name, unsigned int priv_size,

				  u64 obj_start, int verbose)
@@ -81,6 +91,7 @@ struct dso *dso__new(const char *name, unsigned int sym_priv_size) 
		self->sym_priv_size = sym_priv_size;

		self->find_symbol = dso__find_symbol;

		self->slen_calculated = 0;

		self->origin = DSO__ORIG_NOT_FOUND;

	}



	return self;
@@ -710,7 +721,7 @@ static char *dso__read_build_id(struct dso *self, int verbose) 
		++raw;

		bid += 2;

	}

	if (verbose)

	if (verbose >= 2)

		printf("%s(%s): %s\n", __func__, self->name, build_id);

out_elf_end:

	elf_end(elf);
@@ -720,11 +731,26 @@ out: 
	return build_id;

}



char dso__symtab_origin(const struct dso *self)

{

	static const char origin[] = {

		[DSO__ORIG_KERNEL] =   'k',

		[DSO__ORIG_JAVA_JIT] = 'j',

		[DSO__ORIG_FEDORA] =   'f',

		[DSO__ORIG_UBUNTU] =   'u',

		[DSO__ORIG_BUILDID] =  'b',

		[DSO__ORIG_DSO] =      'd',

	};



	if (self == NULL || self->origin == DSO__ORIG_NOT_FOUND)

		return '!';

	return origin[self->origin];

}



int dso__load(struct dso *self, symbol_filter_t filter, int verbose)

{

	int size = PATH_MAX;

	char *name = malloc(size), *build_id = NULL;

	int variant = 0;

	int ret = -1;

	int fd;
@@ -733,19 +759,26 @@ int dso__load(struct dso *self, symbol_filter_t filter, int verbose) 


	self->adjust_symbols = 0;



	if (strncmp(self->name, "/tmp/perf-", 10) == 0)

		return dso__load_perf_map(self, filter, verbose);

	if (strncmp(self->name, "/tmp/perf-", 10) == 0) {

		ret = dso__load_perf_map(self, filter, verbose);

		self->origin = ret > 0 ? DSO__ORIG_JAVA_JIT :

					 DSO__ORIG_NOT_FOUND;

		return ret;

	}



	self->origin = DSO__ORIG_FEDORA - 1;



more:

	do {

		switch (variant) {

		case 0: /* Fedora */

		self->origin++;

		switch (self->origin) {

		case DSO__ORIG_FEDORA:

			snprintf(name, size, "/usr/lib/debug%s.debug", self->name);

			break;

		case 1: /* Ubuntu */

		case DSO__ORIG_UBUNTU:

			snprintf(name, size, "/usr/lib/debug%s", self->name);

			break;

		case 2:

		case DSO__ORIG_BUILDID:

			build_id = dso__read_build_id(self, verbose);

			if (build_id != NULL) {

				snprintf(name, size,
@@ -754,16 +787,15 @@ more: 
				free(build_id);

				break;

			}

			variant++;

			self->origin++;

			/* Fall thru */

		case 3: /* Sane people */

		case DSO__ORIG_DSO:

			snprintf(name, size, "%s", self->name);

			break;



		default:

			goto out;

		}

		variant++;



		fd = open(name, O_RDONLY);

	} while (fd < 0);
@@ -899,6 +931,9 @@ int dso__load_kernel(struct dso *self, const char *vmlinux, 
	if (err <= 0)

		err = dso__load_kallsyms(self, filter, verbose);



	if (err > 0)

		self->origin = DSO__ORIG_KERNEL;



	return err;

}

tools/perf/util/symbol.h

+2 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ struct dso { 
	unsigned int	 sym_priv_size;

	unsigned char	 adjust_symbols;

	unsigned char	 slen_calculated;

	unsigned char	 origin;

	char		 name[0];

};
@@ -49,6 +50,7 @@ int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose); 
int dso__load(struct dso *self, symbol_filter_t filter, int verbose);



size_t dso__fprintf(struct dso *self, FILE *fp);

char dso__symtab_origin(const struct dso *self);



void symbol__init(void);

#endif /* _PERF_SYMBOL_ */

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