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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-07-11 12:18:34 -0300
committerIngo Molnar <mingo@elte.hu>2009-07-11 19:20:25 +0200
commit27d0fd410c3cee00ece2e55f4354a7a9ec1a6a6a (patch)
treea81c59fef46f70e700e86f04a3bf5b90d7cd17b9 /tools
parent60c1baf1248e00d423604f018c8af1cf750ad885 (diff)
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strlist: Introduce strlist__entry and strlist__nr_entries methods
The strlist__entry method allows accessing strlists like an array, will be used in the 'perf report' to access the first entry. We now keep the nr_entries so that we can check if we have just one entry, will be used in 'perf report' to improve the output by showing just at the top when we have just, say, one DSO. While at it use nr_entries to optimize strlist__is_empty by not using the far more costly rb_first based implementation. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <1247325517-12272-2-git-send-email-acme@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/strlist.c20
-rw-r--r--tools/perf/util/strlist.h11
2 files changed, 27 insertions, 4 deletions
diff --git a/tools/perf/util/strlist.c b/tools/perf/util/strlist.c
index 025a78edfff..7ad38171dc2 100644
--- a/tools/perf/util/strlist.c
+++ b/tools/perf/util/strlist.c
@@ -64,6 +64,7 @@ int strlist__add(struct strlist *self, const char *new_entry)
rb_link_node(&sn->rb_node, parent, p);
rb_insert_color(&sn->rb_node, &self->entries);
+ ++self->nr_entries;
return 0;
}
@@ -155,8 +156,9 @@ struct strlist *strlist__new(bool dupstr, const char *slist)
struct strlist *self = malloc(sizeof(*self));
if (self != NULL) {
- self->entries = RB_ROOT;
- self->dupstr = dupstr;
+ self->entries = RB_ROOT;
+ self->dupstr = dupstr;
+ self->nr_entries = 0;
if (slist && strlist__parse_list(self, slist) != 0)
goto out_error;
}
@@ -182,3 +184,17 @@ void strlist__delete(struct strlist *self)
free(self);
}
}
+
+struct str_node *strlist__entry(const struct strlist *self, unsigned int idx)
+{
+ struct rb_node *nd;
+
+ for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
+ struct str_node *pos = rb_entry(nd, struct str_node, rb_node);
+
+ if (!idx--)
+ return pos;
+ }
+
+ return NULL;
+}
diff --git a/tools/perf/util/strlist.h b/tools/perf/util/strlist.h
index 2fdcfee8758..921818e44a5 100644
--- a/tools/perf/util/strlist.h
+++ b/tools/perf/util/strlist.h
@@ -11,7 +11,8 @@ struct str_node {
struct strlist {
struct rb_root entries;
- bool dupstr;
+ unsigned int nr_entries;
+ bool dupstr;
};
struct strlist *strlist__new(bool dupstr, const char *slist);
@@ -21,11 +22,17 @@ void strlist__remove(struct strlist *self, struct str_node *sn);
int strlist__load(struct strlist *self, const char *filename);
int strlist__add(struct strlist *self, const char *str);
+struct str_node *strlist__entry(const struct strlist *self, unsigned int idx);
bool strlist__has_entry(struct strlist *self, const char *entry);
static inline bool strlist__empty(const struct strlist *self)
{
- return rb_first(&self->entries) == NULL;
+ return self->nr_entries == 0;
+}
+
+static inline unsigned int strlist__nr_entries(const struct strlist *self)
+{
+ return self->nr_entries;
}
int strlist__parse_list(struct strlist *self, const char *s);