summaryrefslogtreecommitdiff
path: root/tools/perf/util/unwind.h
diff options
context:
space:
mode:
authorNamhyung Kim <namhyung@kernel.org>2014-10-06 09:46:00 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-10-15 17:38:23 -0300
commit66f066d8994bd146304bab72fa09c1e644c4b3ff (patch)
tree9e958638fe69c2df70107aab7015be8bc36da4f3 /tools/perf/util/unwind.h
parent0cdccac6fe4b1316f04f0dbfcc4efab51932014a (diff)
perf callchain: Create an address space per thread
The unw_addr_space_t in libunwind represents an address space to be used for stack unwinding. It doesn't need to be create/destory everytime to unwind callchain (as in get_entries) and can have a same lifetime as thread (unless exec called). So move the address space construction/destruction logic to the thread lifetime handling functions. This is a preparation to enable caching in the unwind library. Note that it saves unw_addr_space_t object using thread__set_priv(). It seems currently only used by perf trace and perf kvm stat commands which don't use callchain. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Jean Pihet <jean.pihet@linaro.org> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Arun Sharma <asharma@fb.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1412556363-26229-3-git-send-email-namhyung@kernel.org [ Fixup unwind-libunwind.c missing CALLCHAIN_DWARF definition, added missing __maybe_unused on unused parameters in stubs at util/unwind.h ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/unwind.h')
-rw-r--r--tools/perf/util/unwind.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index f03061260b4e..c17c4855bdbc 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -4,6 +4,7 @@
#include <linux/types.h>
#include "event.h"
#include "symbol.h"
+#include "thread.h"
struct unwind_entry {
struct map *map;
@@ -21,6 +22,15 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
/* libunwind specific */
#ifdef HAVE_LIBUNWIND_SUPPORT
int libunwind__arch_reg_id(int regnum);
+int unwind__prepare_access(struct thread *thread);
+void unwind__finish_access(struct thread *thread);
+#else
+static inline int unwind__prepare_access(struct thread *thread __maybe_unused)
+{
+ return 0;
+}
+
+static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
#endif
#else
static inline int
@@ -33,5 +43,12 @@ unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
{
return 0;
}
+
+static inline int unwind__prepare_access(struct thread *thread __maybe_unused)
+{
+ return 0;
+}
+
+static inline void unwind__finish_access(struct thread *thread __maybe_unused) {}
#endif /* HAVE_DWARF_UNWIND_SUPPORT */
#endif /* __UNWIND_H */