perf symbols: Don't try to load kallsyms if doesn't match the record build-id
Now a perf.data file collected on a x86_64 fedora 12 machine
gets properly parsed on a Debian testing PARISC64 machine with
32-bit userland:
acme@parisc:~/git/linux-2.6-tip$ perf report 2> /dev/null | head -15
# Samples: 293085637
#
# Overhead Command Shared Object Symbol
# ........ ............... ................................. ......
#
35.11% find [kernel.kallsyms] [k] 0xffffffff81002b5a
18.25% perf [kernel.kallsyms] [k] 0xffffffff8102235f
9.07% find find [.] 0x0000000000fb0e
5.80% swapper [kernel.kallsyms] [k] 0xffffffff8102235f
3.29% perf libc-2.10.2.so [.] __GI_strcmp
2.70% find libc-2.10.2.so [.] __GI_memmove
2.33% init [kernel.kallsyms] [k] 0xffffffff810091b9
2.03% find libc-2.10.2.so [.] _int_malloc
1.67% find libc-2.10.2.so [.] _IO_vfprintf_internal
1.65% sshd libcrypto.so.0.9.8k [.] 0x00000000105440
acme@parisc:~/git/linux-2.6-tip$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1263501006-14185-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 381999d..71d23e1 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1608,11 +1608,11 @@
u8 kallsyms_build_id[BUILD_ID_SIZE];
if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
- sizeof(kallsyms_build_id)) == 0)
-
- is_kallsyms = dso__build_id_equal(self, kallsyms_build_id);
- if (is_kallsyms)
- goto do_kallsyms;
+ sizeof(kallsyms_build_id)) == 0) {
+ is_kallsyms = dso__build_id_equal(self, kallsyms_build_id);
+ if (is_kallsyms)
+ goto do_kallsyms;
+ }
goto do_vmlinux;
}
@@ -1623,6 +1623,9 @@
do_vmlinux:
err = dso__load_vmlinux(self, map, session, self->long_name, filter);
if (err <= 0) {
+ if (self->has_build_id)
+ return -1;
+
pr_info("The file %s cannot be used, "
"trying to use /proc/kallsyms...", self->long_name);
do_kallsyms: