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perf symbols: Store vdso buildid unconditionally

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When unwinding callchains on a different machine, vdso info should be
available so the unwind process won't be interrupted if address falls
into vdso region. But in most cases, the addresses of sample events are
not in vdso range, the buildid of a zero hit vdso won't be stored into
perf.data.

This patch stores vdso buildid regardless of whether the vdso is hit or
not.

Signed-off-by: He Kuang <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Ekaterina Tumanova <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Sukadev Bhattiprolu <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
He Kuang 2016-05-12 08:43:11 +00:00 • committed by Arnaldo Carvalho de Melo
commit 6ae98ba611
2 changed files with 3 additions and 2 deletions
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2
tools/perf/util/build-id.c
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@ -256,7 +256,7 @@ static int machine__write_buildid_table(struct machine *machine, int fd)
size_t name_len;
bool in_kernel = false;
if (!pos->hit)
if (!pos->hit && !dso__is_vdso(pos))
continue;
if (dso__is_vdso(pos)) {

3
tools/perf/util/dso.c
View file

@ -7,6 +7,7 @@
#include "auxtrace.h"
#include "util.h"
#include "debug.h"
#include "vdso.h"
char dso__symtab_origin(const struct dso *dso)
{
@ -1169,7 +1170,7 @@ bool __dsos__read_build_ids(struct list_head *head, bool with_hits)
struct dso *pos;
list_for_each_entry(pos, head, node) {
if (with_hits && !pos->hit)
if (with_hits && !pos->hit && !dso__is_vdso(pos))
continue;
if (pos->has_build_id) {
have_build_id = true;