Commit 432746f8 authored Sep 01, 2016 by Arnaldo Carvalho de Melo

perf symbols: Fixup symbol sizes before picking best ones

When we call symbol__fixup_duplicate() we use algorithms to pick the
"best" symbols for cases where there are various functions/aliases to an
address, and those check zero size symbols, which, before calling
symbol__fixup_end() are _all_ symbols in a just parsed kallsyms file.

So first fixup the end, then fixup the duplicates.

Found while trying to figure out why 'perf test vmlinux' failed, see the
output of 'perf test -v vmlinux' to see cases where the symbols picked
as best for vmlinux don't match the ones picked for kallsyms.

Cc: Anton Blanchard <anton@samba.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Fixes: 694bf407 ("perf symbols: Add some heuristics for choosing the best duplicate symbol")
Link: http://lkml.kernel.org/n/tip-rxqvdgr0mqjdxee0kf8i2ufn@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent c97b40e4

tools/perf/util/symbol-elf.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1136,8 +1136,8 @@ int dso__load_sym(struct dso dso, struct map map,
		* For misannotated, zeroed, ASM function sizes.
		*/
		if (nr > 0) {
		symbols__fixup_duplicate(&dso->symbols[map->type]);
		symbols__fixup_end(&dso->symbols[map->type]);
		symbols__fixup_duplicate(&dso->symbols[map->type]);
		if (kmap) {
		/*
		* We need to fixup this here too because we create new

tools/perf/util/symbol.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1243,8 +1243,8 @@ int __dso__load_kallsyms(struct dso dso, const char filename,
		if (kallsyms__delta(map, filename, &delta))
		return -1;

		symbols__fixup_duplicate(&dso->symbols[map->type]);
		symbols__fixup_end(&dso->symbols[map->type]);
		symbols__fixup_duplicate(&dso->symbols[map->type]);

		if (dso->kernel == DSO_TYPE_GUEST_KERNEL)
		dso->symtab_type = DSO_BINARY_TYPE__GUEST_KALLSYMS;