pert-report doesn't resolve function names in VDSO:
$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
8.76%
0x7fff6b1fe861
__gettimeofday
ACE_OS::gettimeofday()
...
In this case symbol values should be adjusted the same way as for executables,
relocatable objects and prelinked libraries.
After fix:
$ perf report --stdio -g flat,0.0,15,callee --sort pid
...
8.76%
__vdso_gettimeofday
__gettimeofday
ACE_OS::gettimeofday()
...
---------------------------------------------------------------------------------------------------------------------------
perf tools: Adjust symbols in VDSO
Signed-off-by: Vladimir Nikulichev <[email protected]>
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 3b7dbf5..9c8b23b 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -6,6 +6,7 @@
#include <inttypes.h>
#include "symbol.h"
+#include "vdso.h"
#include <symbol/kallsyms.h>
#include "debug.h"
@@ -618,6 +619,8 @@ int symsrc__init(struct symsrc *ss, struct dso *dso, const
char *name,
GElf_Shdr shdr;
ss->adjust_symbols = (ehdr.e_type == ET_EXEC ||
ehdr.e_type == ET_REL ||
+ (dso->symsrc_filename == NULL &&
+ is_vdso_map(dso->short_name)) ||
elf_section_by_name(elf, &ehdr, &shdr,
".gnu.prelink_undo",
NULL) != NULL);--
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