linux/tools/perf/util/vdso.h
Adrian Hunter f6832e1720 perf tools: Add support for 32-bit compatibility VDSOs
'perf record' post-processes the event stream  to create a list of
build-ids for object files for which sample events have been recorded.
That results in those object files being recorded in the build-id cache.

In the case of VDSO, perf tools reads it from memory and copies it into
a temporary file, which as decribed above, gets added to the build-id
cache.

Then when the perf.data file is processed by other tools, the build-id
of VDSO is listed in the perf.data file and the VDSO can be read from
the build-id cache.  In that case the name of the map, the short name of
the DSO, and the entry in the build-id cache are all "[vdso]".

However, in the 64-bit case, there also can be 32-bit compatibility
VDSOs.

A previous patch added programs "perf-read-vdso32" and "perf
read-vdsox32".

This patch uses those programs to read the correct VDSO for a thread and
create a temporary file just as for the 64-bit VDSO.

The map name and the entry in the build-id cache are still "[vdso]" but
the DSO short name becomes "[vdso32]" and "[vdsox32]" respectively.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1414061124-26830-16-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-10-29 10:32:48 -02:00

30 lines
588 B
C

#ifndef __PERF_VDSO__
#define __PERF_VDSO__
#include <linux/types.h>
#include <string.h>
#include <stdbool.h>
#define VDSO__MAP_NAME "[vdso]"
#define DSO__NAME_VDSO "[vdso]"
#define DSO__NAME_VDSO32 "[vdso32]"
#define DSO__NAME_VDSOX32 "[vdsox32]"
static inline bool is_vdso_map(const char *filename)
{
return !strcmp(filename, VDSO__MAP_NAME);
}
struct dso;
bool dso__is_vdso(struct dso *dso);
struct machine;
struct thread;
struct dso *vdso__dso_findnew(struct machine *machine, struct thread *thread);
void vdso__exit(struct machine *machine);
#endif /* __PERF_VDSO__ */