perf buildid-list: Introduce --with-hits option

Using this option 'perf buildid-list' will process all samples,
marking the DSOs that had some hits to list just them.

This in turn will be used by a new porcelain, 'perf archive',
that will be just a shell script to create a tarball from the
'perf buildid-list --with-hits' output and the files cached by
'perf record' in ~/.debug.

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: <1263519930-22803-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 4229c2c..431f204 100644 (file)
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -16,6 +16,7 @@
 
 static char const *input_name = "perf.data";
 static int force;
+static bool with_hits;
 
 static const char * const buildid_list_usage[] = {
        "perf buildid-list [<options>]",
@@ -23,6 +24,7 @@ static const char * const buildid_list_usage[] = {
 };
 
 static const struct option options[] = {
+       OPT_BOOLEAN('H', "with-hits", &with_hits, "Show only DSOs with hits"),
        OPT_STRING('i', "input", &input_name, "file",
                    "input file name"),
        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
@@ -31,6 +33,34 @@ static const struct option options[] = {
        OPT_END()
 };
 
+static int build_id_list__process_event(event_t *event,
+                                       struct perf_session *session)
+{
+       struct addr_location al;
+       u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
+       struct thread *thread = perf_session__findnew(session, event->ip.pid);
+
+       if (thread == NULL) {
+               pr_err("problem processing %d event, skipping it.\n",
+                       event->header.type);
+               return -1;
+       }
+
+       thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
+                             event->ip.ip, &al);
+
+       if (al.map != NULL)
+               al.map->dso->hit = 1;
+
+       return 0;
+}
+
+static struct perf_event_ops build_id_list__event_ops = {
+       .sample = build_id_list__process_event,
+       .mmap   = event__process_mmap,
+       .fork   = event__process_task,
+};
+
 static int __cmd_buildid_list(void)
 {
        int err = -1;
@@ -40,7 +70,10 @@ static int __cmd_buildid_list(void)
        if (session == NULL)
                return -1;
 
-       dsos__fprintf_buildid(stdout);
+       if (with_hits)
+               perf_session__process_events(session, &build_id_list__event_ops);
+
+       dsos__fprintf_buildid(stdout, with_hits);
 
        perf_session__delete(session);
        return err;

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 4267138..a4e7459 100644 (file)
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1716,22 +1716,25 @@ void dsos__fprintf(FILE *fp)
        __dsos__fprintf(&dsos__user, fp);
 }
 
-static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp)
+static size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
+                                     bool with_hits)
 {
        struct dso *pos;
        size_t ret = 0;
 
        list_for_each_entry(pos, head, node) {
+               if (with_hits && !pos->hit)
+                       continue;
                ret += dso__fprintf_buildid(pos, fp);
                ret += fprintf(fp, " %s\n", pos->long_name);
        }
        return ret;
 }
 
-size_t dsos__fprintf_buildid(FILE *fp)
+size_t dsos__fprintf_buildid(FILE *fp, bool with_hits)
 {
-       return (__dsos__fprintf_buildid(&dsos__kernel, fp) +
-               __dsos__fprintf_buildid(&dsos__user, fp));
+       return (__dsos__fprintf_buildid(&dsos__kernel, fp, with_hits) +
+               __dsos__fprintf_buildid(&dsos__user, fp, with_hits));
 }
 
 static struct dso *dsos__create_kernel(const char *vmlinux)

diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 36b7c71..525085f 100644 (file)
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -97,6 +97,7 @@ struct dso {
        u8               slen_calculated:1;
        u8               has_build_id:1;
        u8               kernel:1;
+       u8               hit:1;
        unsigned char    origin;
        u8               sorted_by_name;
        u8               loaded;
@@ -129,7 +130,7 @@ struct perf_session;
 int dso__load(struct dso *self, struct map *map, struct perf_session *session,
              symbol_filter_t filter);
 void dsos__fprintf(FILE *fp);
-size_t dsos__fprintf_buildid(FILE *fp);
+size_t dsos__fprintf_buildid(FILE *fp, bool with_hits);
 
 size_t dso__fprintf_buildid(struct dso *self, FILE *fp);
 size_t dso__fprintf(struct dso *self, enum map_type type, FILE *fp);