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perf symbols: Allow symbol alias when loading map for symbol name

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When perf probe tries to add a probe in a binary using symbol name, it
sometimes failed since some symbols were discard during loading dso.

When it resolves an address to symbol, it'd be better to have just one
symbol at given address.  But for finding address from symbol, it'd be
better to keep all names (including aliases).

So allow tools to state that they want to allow aliases via
symbol_conf.allow_aliases.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Naohiro Aota <naota@elisp.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150306073127.6904.3232.stgit@localhost.localdomain
[ Original patch passwd allow_alias to many functions, use symbol_conf.allow_aliases instead ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2015-03-06 16:31:27 +09:00 committed by Arnaldo Carvalho de Melo
parent 0687eba787
commit 680d926a8c
3 changed files with 4 additions and 1 deletions
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1
tools/perf/util/probe-event.c
View file

@ -80,6 +80,7 @@ static int init_symbol_maps(bool user_only)
int ret;
symbol_conf.sort_by_name = true;
symbol_conf.allow_aliases = true;
ret = symbol__init(NULL);
if (ret < 0) {
pr_debug("Failed to init symbol map.\n");

3
tools/perf/util/symbol-elf.c
View file

@ -1048,7 +1048,8 @@ new_symbol:
* For misannotated, zeroed, ASM function sizes.
*/
if (nr > 0) {
symbols__fixup_duplicate(&dso->symbols[map->type]);
if (!symbol_conf.allow_aliases)
symbols__fixup_duplicate(&dso->symbols[map->type]);
symbols__fixup_end(&dso->symbols[map->type]);
if (kmap) {
/*

1
tools/perf/util/symbol.h
View file

@ -87,6 +87,7 @@ struct symbol_conf {
ignore_vmlinux_buildid,
show_kernel_path,
use_modules,
allow_aliases,
sort_by_name,
show_nr_samples,
show_total_period,