Commit 680d926a authored Mar 06, 2015 by Namhyung Kim Committed by Arnaldo Carvalho de Melo Mar 12, 2015

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



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>

parent 0687eba7

tools/perf/util/probe-event.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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");

tools/perf/util/symbol-elf.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1048,6 +1048,7 @@ new_symbol:
		* For misannotated, zeroed, ASM function sizes.
		*/
		if (nr > 0) {
		if (!symbol_conf.allow_aliases)
		symbols__fixup_duplicate(&dso->symbols[map->type]);
		symbols__fixup_end(&dso->symbols[map->type]);
		if (kmap) {

tools/perf/util/symbol.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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,

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