From 7dbf4dcfe2987c35c2c4675cd7ae1b6006979176 Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Mon, 10 Sep 2012 18:50:19 +0200 Subject: perf tools: Back [vdso] DSO with real data Storing data for VDSO shared object, because we need it for the post unwind processing. The VDSO shared object is same for all process on a running system, so it makes no difference when we store it inside the tracer - perf. When [vdso] map memory is hit, we retrieve [vdso] DSO image and store it into temporary file. During the build-id processing phase, the [vdso] DSO image is stored in build-id db, and build-id reference is made inside perf.data. The build-id vdso file object is called '[vdso]'. We don't use temporary file name which gets removed when record is finished. During report phase the vdso build-id object is treated as any other build-id DSO object. Adding following API for vdso object: bool is_vdso_map(const char *filename) - returns true if the filename matches vdso map name struct dso *vdso__dso_findnew(struct list_head *head) - find/create proper vdso DSO object vdso__exit(void) - removes temporary VDSO image if there's any This change makes backtrace dwarf post unwind possible from [vdso] maps. Following output is current report of [vdso] sample dwarf backtrace: # Overhead Command Shared Object Symbol # ........ ....... ................. ............................. # 99.52% ex [vdso] [.] 0x00007fff3ace89af | --- 0x7fff3ace89af Following output is new report of [vdso] sample dwarf backtrace: # Overhead Command Shared Object Symbol # ........ ....... ................. ............................. # 99.52% ex [vdso] [.] 0x00000000000009af | --- 0x7fff3ace89af main __libc_start_main _start Signed-off-by: Jiri Olsa Acked-by: Peter Zijlstra Cc: Frederic Weisbecker Cc: Ingo Molnar Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1347295819-23177-5-git-send-email-jolsa@redhat.com [ committer note: s/ALIGN/PERF_ALIGN/g to cope with the android build changes ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/map.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'tools/perf/util/map.c') diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 7d37159c1e99..b442ee49452b 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -9,6 +9,7 @@ #include "map.h" #include "thread.h" #include "strlist.h" +#include "vdso.h" const char *map_type__name[MAP__NR_TYPES] = { [MAP__FUNCTION] = "Functions", @@ -23,7 +24,6 @@ static inline int is_anon_memory(const char *filename) static inline int is_no_dso_memory(const char *filename) { return !strcmp(filename, "[stack]") || - !strcmp(filename, "[vdso]") || !strcmp(filename, "[heap]"); } @@ -52,9 +52,10 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len, if (self != NULL) { char newfilename[PATH_MAX]; struct dso *dso; - int anon, no_dso; + int anon, no_dso, vdso; anon = is_anon_memory(filename); + vdso = is_vdso_map(filename); no_dso = is_no_dso_memory(filename); if (anon) { @@ -62,7 +63,12 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len, filename = newfilename; } - dso = __dsos__findnew(dsos__list, filename); + if (vdso) { + pgoff = 0; + dso = vdso__dso_findnew(dsos__list); + } else + dso = __dsos__findnew(dsos__list, filename); + if (dso == NULL) goto out_delete; -- cgit v1.2.3-59-g8ed1b