perf symbols: Move symbol filtering to event__preprocess_sample()

So that --dsos, --comm, --symbols can bem used in more tools,
like in perf diff:

$ perf record -f find / > /dev/null
$ perf record -f find / > /dev/null
$ perf diff --dsos /lib64/libc-2.10.1.so | head -5
   1        +22392124     /lib64/libc-2.10.1.so   _IO_vfprintf_internal
   2         +6410655     /lib64/libc-2.10.1.so   __GI_memmove
   3    +1   +9192692     /lib64/libc-2.10.1.so   _int_malloc
   4    -1  -15158605     /lib64/libc-2.10.1.so   _int_free
   5           +45669     /lib64/libc-2.10.1.so   _IO_new_file_xsputn
$

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260914682-29652-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 16 insertions, 3 deletions

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 4fde60655341..ff91e9c291bb 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -50,6 +50,9 @@ static int diff__process_sample_event(event_t *event, struct perf_session *sessi
                 return -1;
         }
 
+        if (al.filtered)
+                return 0;
+
         event__parse_sample(event, session->sample_type, &data);
 
         if (al.sym && perf_session__add_hist_entry(session, &al, data.period)) {
@@ -182,10 +185,14 @@ blank:		memset(displacement, ' ', sizeof(displacement));
         printed = fprintf(fp, "%4lu %5.5s ", pos, displacement);
 
         if (show_percent) {
-                double old_percent = (old_count * 100) / pair_session->events_stats.total,
-                       new_percent = (self->count * 100) / session->events_stats.total;
-                double diff = old_percent - new_percent;
+                double old_percent = 0, new_percent = 0, diff;
+
+                if (pair_session->events_stats.total > 0)
+                        old_percent = (old_count * 100) / pair_session->events_stats.total;
+                if (session->events_stats.total > 0)
+                        new_percent = (self->count * 100) / session->events_stats.total;
 
+                diff = old_percent - new_percent;
                 if (verbose)
                         printed += fprintf(fp, " %3.2f%% %3.2f%%", old_percent, new_percent);
 
@@ -260,6 +267,12 @@ static const struct option options[] = {
                     "Don't shorten the pathnames taking into account the cwd"),
         OPT_BOOLEAN('P', "full-paths", &event_ops.full_paths,
                     "Don't shorten the pathnames taking into account the cwd"),
+        OPT_STRING('d', "dsos", &symbol_conf.dso_list_str, "dso[,dso...]",
+                   "only consider symbols in these dsos"),
+        OPT_STRING('C', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
+                   "only consider symbols in these comms"),
+        OPT_STRING('S', "symbols", &symbol_conf.sym_list_str, "symbol[,symbol...]",
+                   "only consider these symbols"),
         OPT_END()
 };