perf tools: Introducing rblist

rblist is the rbtree based code from strlist. It will be the common code
for strlist and the to-be-introduced intlist.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1343709095-7089-2-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 77f124f..285f700 100644 (file)
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -319,6 +319,7 @@ LIB_H += $(ARCH_INCLUDE)
 LIB_H += util/cgroup.h
 LIB_H += $(TRACE_EVENT_DIR)event-parse.h
 LIB_H += util/target.h
+LIB_H += util/rblist.h
 
 LIB_OBJS += $(OUTPUT)util/abspath.o
 LIB_OBJS += $(OUTPUT)util/alias.o
@@ -383,6 +384,7 @@ LIB_OBJS += $(OUTPUT)util/xyarray.o
 LIB_OBJS += $(OUTPUT)util/cpumap.o
 LIB_OBJS += $(OUTPUT)util/cgroup.o
 LIB_OBJS += $(OUTPUT)util/target.o
+LIB_OBJS += $(OUTPUT)util/rblist.o
 
 BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
 

diff --git a/tools/perf/util/rblist.c b/tools/perf/util/rblist.c
new file mode 100644 (file)
index 0000000..0171fb6
--- /dev/null
+++ b/tools/perf/util/rblist.c
@@ -0,0 +1,107 @@
+/*
+ * Based on strlist.c by:
+ * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
+ *
+ * Licensed under the GPLv2.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "rblist.h"
+
+int rblist__add_node(struct rblist *rblist, const void *new_entry)
+{
+       struct rb_node **p = &rblist->entries.rb_node;
+       struct rb_node *parent = NULL, *new_node;
+
+       while (*p != NULL) {
+               int rc;
+
+               parent = *p;
+
+               rc = rblist->node_cmp(parent, new_entry);
+               if (rc > 0)
+                       p = &(*p)->rb_left;
+               else if (rc < 0)
+                       p = &(*p)->rb_right;
+               else
+                       return -EEXIST;
+       }
+
+       new_node = rblist->node_new(rblist, new_entry);
+       if (new_node == NULL)
+               return -ENOMEM;
+
+       rb_link_node(new_node, parent, p);
+       rb_insert_color(new_node, &rblist->entries);
+       ++rblist->nr_entries;
+
+       return 0;
+}
+
+void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
+{
+       rb_erase(rb_node, &rblist->entries);
+       rblist->node_delete(rblist, rb_node);
+}
+
+struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
+{
+       struct rb_node **p = &rblist->entries.rb_node;
+       struct rb_node *parent = NULL;
+
+       while (*p != NULL) {
+               int rc;
+
+               parent = *p;
+
+               rc = rblist->node_cmp(parent, entry);
+               if (rc > 0)
+                       p = &(*p)->rb_left;
+               else if (rc < 0)
+                       p = &(*p)->rb_right;
+               else
+                       return parent;
+       }
+
+       return NULL;
+}
+
+void rblist__init(struct rblist *rblist)
+{
+       if (rblist != NULL) {
+               rblist->entries  = RB_ROOT;
+               rblist->nr_entries = 0;
+       }
+
+       return;
+}
+
+void rblist__delete(struct rblist *rblist)
+{
+       if (rblist != NULL) {
+               struct rb_node *pos, *next = rb_first(&rblist->entries);
+
+               while (next) {
+                       pos = next;
+                       next = rb_next(pos);
+                       rb_erase(pos, &rblist->entries);
+                       rblist->node_delete(rblist, pos);
+               }
+               free(rblist);
+       }
+}
+
+struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
+{
+       struct rb_node *node;
+
+       for (node = rb_first(&rblist->entries); node; node = rb_next(node)) {
+               if (!idx--)
+                       return node;
+       }
+
+       return NULL;
+}

diff --git a/tools/perf/util/rblist.h b/tools/perf/util/rblist.h
new file mode 100644 (file)
index 0000000..6d0cae5
--- /dev/null
+++ b/tools/perf/util/rblist.h
@@ -0,0 +1,47 @@
+#ifndef __PERF_RBLIST_H
+#define __PERF_RBLIST_H
+
+#include <linux/rbtree.h>
+#include <stdbool.h>
+
+/*
+ * create node structs of the form:
+ * struct my_node {
+ *     struct rb_node rb_node;
+ *     ... my data ...
+ * };
+ *
+ * create list structs of the form:
+ * struct mylist {
+ *     struct rblist rblist;
+ *     ... my data ...
+ * };
+ */
+
+struct rblist {
+       struct rb_root entries;
+       unsigned int   nr_entries;
+
+       int (*node_cmp)(struct rb_node *rbn, const void *entry);
+       struct rb_node *(*node_new)(struct rblist *rlist, const void *new_entry);
+       void (*node_delete)(struct rblist *rblist, struct rb_node *rb_node);
+};
+
+void rblist__init(struct rblist *rblist);
+void rblist__delete(struct rblist *rblist);
+int rblist__add_node(struct rblist *rblist, const void *new_entry);
+void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node);
+struct rb_node *rblist__find(struct rblist *rblist, const void *entry);
+struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx);
+
+static inline bool rblist__empty(const struct rblist *rblist)
+{
+       return rblist->nr_entries == 0;
+}
+
+static inline unsigned int rblist__nr_entries(const struct rblist *rblist)
+{
+       return rblist->nr_entries;
+}
+
+#endif /* __PERF_RBLIST_H */