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-rw-r--r--arch/x86/lib/usercopy.c2
-rw-r--r--kernel/events/core.c8
-rw-r--r--kernel/events/internal.h10
-rw-r--r--kernel/events/ring_buffer.c27
-rw-r--r--tools/include/linux/compiler.h58
-rw-r--r--tools/include/linux/export.h10
-rw-r--r--tools/include/linux/rbtree.h104
-rw-r--r--tools/include/linux/rbtree_augmented.h245
-rw-r--r--tools/lib/rbtree.c548
-rw-r--r--tools/perf/MANIFEST6
-rw-r--r--tools/perf/util/Build2
-rw-r--r--tools/perf/util/include/linux/rbtree.h16
-rw-r--r--tools/perf/util/include/linux/rbtree_augmented.h2
13 files changed, 995 insertions, 43 deletions
diff --git a/arch/x86/lib/usercopy.c b/arch/x86/lib/usercopy.c
index ddf9ecb53cc3..e342586db6e4 100644
--- a/arch/x86/lib/usercopy.c
+++ b/arch/x86/lib/usercopy.c
@@ -20,7 +20,7 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
20 unsigned long ret; 20 unsigned long ret;
21 21
22 if (__range_not_ok(from, n, TASK_SIZE)) 22 if (__range_not_ok(from, n, TASK_SIZE))
23 return 0; 23 return n;
24 24
25 /* 25 /*
26 * Even though this function is typically called from NMI/IRQ context 26 * Even though this function is typically called from NMI/IRQ context
diff --git a/kernel/events/core.c b/kernel/events/core.c
index e965cfae4207..d3dae3419b99 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4358,14 +4358,6 @@ static void ring_buffer_wakeup(struct perf_event *event)
4358 rcu_read_unlock(); 4358 rcu_read_unlock();
4359} 4359}
4360 4360
4361static void rb_free_rcu(struct rcu_head *rcu_head)
4362{
4363 struct ring_buffer *rb;
4364
4365 rb = container_of(rcu_head, struct ring_buffer, rcu_head);
4366 rb_free(rb);
4367}
4368
4369struct ring_buffer *ring_buffer_get(struct perf_event *event) 4361struct ring_buffer *ring_buffer_get(struct perf_event *event)
4370{ 4362{
4371 struct ring_buffer *rb; 4363 struct ring_buffer *rb;
diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index 2deb24c7a40d..2bbad9c1274c 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -11,6 +11,7 @@
11struct ring_buffer { 11struct ring_buffer {
12 atomic_t refcount; 12 atomic_t refcount;
13 struct rcu_head rcu_head; 13 struct rcu_head rcu_head;
14 struct irq_work irq_work;
14#ifdef CONFIG_PERF_USE_VMALLOC 15#ifdef CONFIG_PERF_USE_VMALLOC
15 struct work_struct work; 16 struct work_struct work;
16 int page_order; /* allocation order */ 17 int page_order; /* allocation order */
@@ -55,6 +56,15 @@ struct ring_buffer {
55}; 56};
56 57
57extern void rb_free(struct ring_buffer *rb); 58extern void rb_free(struct ring_buffer *rb);
59
60static inline void rb_free_rcu(struct rcu_head *rcu_head)
61{
62 struct ring_buffer *rb;
63
64 rb = container_of(rcu_head, struct ring_buffer, rcu_head);
65 rb_free(rb);
66}
67
58extern struct ring_buffer * 68extern struct ring_buffer *
59rb_alloc(int nr_pages, long watermark, int cpu, int flags); 69rb_alloc(int nr_pages, long watermark, int cpu, int flags);
60extern void perf_event_wakeup(struct perf_event *event); 70extern void perf_event_wakeup(struct perf_event *event);
diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 96472824a752..b2be01b1aa9d 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -221,6 +221,8 @@ void perf_output_end(struct perf_output_handle *handle)
221 rcu_read_unlock(); 221 rcu_read_unlock();
222} 222}
223 223
224static void rb_irq_work(struct irq_work *work);
225
224static void 226static void
225ring_buffer_init(struct ring_buffer *rb, long watermark, int flags) 227ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)
226{ 228{
@@ -241,6 +243,16 @@ ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)
241 243
242 INIT_LIST_HEAD(&rb->event_list); 244 INIT_LIST_HEAD(&rb->event_list);
243 spin_lock_init(&rb->event_lock); 245 spin_lock_init(&rb->event_lock);
246 init_irq_work(&rb->irq_work, rb_irq_work);
247}
248
249static void ring_buffer_put_async(struct ring_buffer *rb)
250{
251 if (!atomic_dec_and_test(&rb->refcount))
252 return;
253
254 rb->rcu_head.next = (void *)rb;
255 irq_work_queue(&rb->irq_work);
244} 256}
245 257
246/* 258/*
@@ -319,7 +331,7 @@ err_put:
319 rb_free_aux(rb); 331 rb_free_aux(rb);
320 332
321err: 333err:
322 ring_buffer_put(rb); 334 ring_buffer_put_async(rb);
323 handle->event = NULL; 335 handle->event = NULL;
324 336
325 return NULL; 337 return NULL;
@@ -370,7 +382,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size,
370 382
371 local_set(&rb->aux_nest, 0); 383 local_set(&rb->aux_nest, 0);
372 rb_free_aux(rb); 384 rb_free_aux(rb);
373 ring_buffer_put(rb); 385 ring_buffer_put_async(rb);
374} 386}
375 387
376/* 388/*
@@ -557,7 +569,18 @@ static void __rb_free_aux(struct ring_buffer *rb)
557void rb_free_aux(struct ring_buffer *rb) 569void rb_free_aux(struct ring_buffer *rb)
558{ 570{
559 if (atomic_dec_and_test(&rb->aux_refcount)) 571 if (atomic_dec_and_test(&rb->aux_refcount))
572 irq_work_queue(&rb->irq_work);
573}
574
575static void rb_irq_work(struct irq_work *work)
576{
577 struct ring_buffer *rb = container_of(work, struct ring_buffer, irq_work);
578
579 if (!atomic_read(&rb->aux_refcount))
560 __rb_free_aux(rb); 580 __rb_free_aux(rb);
581
582 if (rb->rcu_head.next == (void *)rb)
583 call_rcu(&rb->rcu_head, rb_free_rcu);
561} 584}
562 585
563#ifndef CONFIG_PERF_USE_VMALLOC 586#ifndef CONFIG_PERF_USE_VMALLOC
diff --git a/tools/include/linux/compiler.h b/tools/include/linux/compiler.h
index f0e72674c52d..9098083869c8 100644
--- a/tools/include/linux/compiler.h
+++ b/tools/include/linux/compiler.h
@@ -41,4 +41,62 @@
41 41
42#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) 42#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
43 43
44#include <linux/types.h>
45
46static __always_inline void __read_once_size(const volatile void *p, void *res, int size)
47{
48 switch (size) {
49 case 1: *(__u8 *)res = *(volatile __u8 *)p; break;
50 case 2: *(__u16 *)res = *(volatile __u16 *)p; break;
51 case 4: *(__u32 *)res = *(volatile __u32 *)p; break;
52 case 8: *(__u64 *)res = *(volatile __u64 *)p; break;
53 default:
54 barrier();
55 __builtin_memcpy((void *)res, (const void *)p, size);
56 barrier();
57 }
58}
59
60static __always_inline void __write_once_size(volatile void *p, void *res, int size)
61{
62 switch (size) {
63 case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
64 case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
65 case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
66 case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
67 default:
68 barrier();
69 __builtin_memcpy((void *)p, (const void *)res, size);
70 barrier();
71 }
72}
73
74/*
75 * Prevent the compiler from merging or refetching reads or writes. The
76 * compiler is also forbidden from reordering successive instances of
77 * READ_ONCE, WRITE_ONCE and ACCESS_ONCE (see below), but only when the
78 * compiler is aware of some particular ordering. One way to make the
79 * compiler aware of ordering is to put the two invocations of READ_ONCE,
80 * WRITE_ONCE or ACCESS_ONCE() in different C statements.
81 *
82 * In contrast to ACCESS_ONCE these two macros will also work on aggregate
83 * data types like structs or unions. If the size of the accessed data
84 * type exceeds the word size of the machine (e.g., 32 bits or 64 bits)
85 * READ_ONCE() and WRITE_ONCE() will fall back to memcpy and print a
86 * compile-time warning.
87 *
88 * Their two major use cases are: (1) Mediating communication between
89 * process-level code and irq/NMI handlers, all running on the same CPU,
90 * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
91 * mutilate accesses that either do not require ordering or that interact
92 * with an explicit memory barrier or atomic instruction that provides the
93 * required ordering.
94 */
95
96#define READ_ONCE(x) \
97 ({ union { typeof(x) __val; char __c[1]; } __u; __read_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
98
99#define WRITE_ONCE(x, val) \
100 ({ union { typeof(x) __val; char __c[1]; } __u = { .__val = (val) }; __write_once_size(&(x), __u.__c, sizeof(x)); __u.__val; })
101
44#endif /* _TOOLS_LINUX_COMPILER_H */ 102#endif /* _TOOLS_LINUX_COMPILER_H */
diff --git a/tools/include/linux/export.h b/tools/include/linux/export.h
deleted file mode 100644
index d07e586b9ba0..000000000000
--- a/tools/include/linux/export.h
+++ /dev/null
@@ -1,10 +0,0 @@
1#ifndef _TOOLS_LINUX_EXPORT_H_
2#define _TOOLS_LINUX_EXPORT_H_
3
4#define EXPORT_SYMBOL(sym)
5#define EXPORT_SYMBOL_GPL(sym)
6#define EXPORT_SYMBOL_GPL_FUTURE(sym)
7#define EXPORT_UNUSED_SYMBOL(sym)
8#define EXPORT_UNUSED_SYMBOL_GPL(sym)
9
10#endif
diff --git a/tools/include/linux/rbtree.h b/tools/include/linux/rbtree.h
new file mode 100644
index 000000000000..112582253dd0
--- /dev/null
+++ b/tools/include/linux/rbtree.h
@@ -0,0 +1,104 @@
1/*
2 Red Black Trees
3 (C) 1999 Andrea Arcangeli <andrea@suse.de>
4
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 linux/include/linux/rbtree.h
20
21 To use rbtrees you'll have to implement your own insert and search cores.
22 This will avoid us to use callbacks and to drop drammatically performances.
23 I know it's not the cleaner way, but in C (not in C++) to get
24 performances and genericity...
25
26 See Documentation/rbtree.txt for documentation and samples.
27*/
28
29#ifndef __TOOLS_LINUX_PERF_RBTREE_H
30#define __TOOLS_LINUX_PERF_RBTREE_H
31
32#include <linux/kernel.h>
33#include <linux/stddef.h>
34
35struct rb_node {
36 unsigned long __rb_parent_color;
37 struct rb_node *rb_right;
38 struct rb_node *rb_left;
39} __attribute__((aligned(sizeof(long))));
40 /* The alignment might seem pointless, but allegedly CRIS needs it */
41
42struct rb_root {
43 struct rb_node *rb_node;
44};
45
46
47#define rb_parent(r) ((struct rb_node *)((r)->__rb_parent_color & ~3))
48
49#define RB_ROOT (struct rb_root) { NULL, }
50#define rb_entry(ptr, type, member) container_of(ptr, type, member)
51
52#define RB_EMPTY_ROOT(root) ((root)->rb_node == NULL)
53
54/* 'empty' nodes are nodes that are known not to be inserted in an rbtree */
55#define RB_EMPTY_NODE(node) \
56 ((node)->__rb_parent_color == (unsigned long)(node))
57#define RB_CLEAR_NODE(node) \
58 ((node)->__rb_parent_color = (unsigned long)(node))
59
60
61extern void rb_insert_color(struct rb_node *, struct rb_root *);
62extern void rb_erase(struct rb_node *, struct rb_root *);
63
64
65/* Find logical next and previous nodes in a tree */
66extern struct rb_node *rb_next(const struct rb_node *);
67extern struct rb_node *rb_prev(const struct rb_node *);
68extern struct rb_node *rb_first(const struct rb_root *);
69extern struct rb_node *rb_last(const struct rb_root *);
70
71/* Postorder iteration - always visit the parent after its children */
72extern struct rb_node *rb_first_postorder(const struct rb_root *);
73extern struct rb_node *rb_next_postorder(const struct rb_node *);
74
75/* Fast replacement of a single node without remove/rebalance/add/rebalance */
76extern void rb_replace_node(struct rb_node *victim, struct rb_node *new,
77 struct rb_root *root);
78
79static inline void rb_link_node(struct rb_node *node, struct rb_node *parent,
80 struct rb_node **rb_link)
81{
82 node->__rb_parent_color = (unsigned long)parent;
83 node->rb_left = node->rb_right = NULL;
84
85 *rb_link = node;
86}
87
88#define rb_entry_safe(ptr, type, member) \
89 ({ typeof(ptr) ____ptr = (ptr); \
90 ____ptr ? rb_entry(____ptr, type, member) : NULL; \
91 })
92
93
94/*
95 * Handy for checking that we are not deleting an entry that is
96 * already in a list, found in block/{blk-throttle,cfq-iosched}.c,
97 * probably should be moved to lib/rbtree.c...
98 */
99static inline void rb_erase_init(struct rb_node *n, struct rb_root *root)
100{
101 rb_erase(n, root);
102 RB_CLEAR_NODE(n);
103}
104#endif /* __TOOLS_LINUX_PERF_RBTREE_H */
diff --git a/tools/include/linux/rbtree_augmented.h b/tools/include/linux/rbtree_augmented.h
new file mode 100644
index 000000000000..43be941db695
--- /dev/null
+++ b/tools/include/linux/rbtree_augmented.h
@@ -0,0 +1,245 @@
1/*
2 Red Black Trees
3 (C) 1999 Andrea Arcangeli <andrea@suse.de>
4 (C) 2002 David Woodhouse <dwmw2@infradead.org>
5 (C) 2012 Michel Lespinasse <walken@google.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20
21 tools/linux/include/linux/rbtree_augmented.h
22
23 Copied from:
24 linux/include/linux/rbtree_augmented.h
25*/
26
27#ifndef _TOOLS_LINUX_RBTREE_AUGMENTED_H
28#define _TOOLS_LINUX_RBTREE_AUGMENTED_H
29
30#include <linux/compiler.h>
31#include <linux/rbtree.h>
32
33/*
34 * Please note - only struct rb_augment_callbacks and the prototypes for
35 * rb_insert_augmented() and rb_erase_augmented() are intended to be public.
36 * The rest are implementation details you are not expected to depend on.
37 *
38 * See Documentation/rbtree.txt for documentation and samples.
39 */
40
41struct rb_augment_callbacks {
42 void (*propagate)(struct rb_node *node, struct rb_node *stop);
43 void (*copy)(struct rb_node *old, struct rb_node *new);
44 void (*rotate)(struct rb_node *old, struct rb_node *new);
45};
46
47extern void __rb_insert_augmented(struct rb_node *node, struct rb_root *root,
48 void (*augment_rotate)(struct rb_node *old, struct rb_node *new));
49/*
50 * Fixup the rbtree and update the augmented information when rebalancing.
51 *
52 * On insertion, the user must update the augmented information on the path
53 * leading to the inserted node, then call rb_link_node() as usual and
54 * rb_augment_inserted() instead of the usual rb_insert_color() call.
55 * If rb_augment_inserted() rebalances the rbtree, it will callback into
56 * a user provided function to update the augmented information on the
57 * affected subtrees.
58 */
59static inline void
60rb_insert_augmented(struct rb_node *node, struct rb_root *root,
61 const struct rb_augment_callbacks *augment)
62{
63 __rb_insert_augmented(node, root, augment->rotate);
64}
65
66#define RB_DECLARE_CALLBACKS(rbstatic, rbname, rbstruct, rbfield, \
67 rbtype, rbaugmented, rbcompute) \
68static inline void \
69rbname ## _propagate(struct rb_node *rb, struct rb_node *stop) \
70{ \
71 while (rb != stop) { \
72 rbstruct *node = rb_entry(rb, rbstruct, rbfield); \
73 rbtype augmented = rbcompute(node); \
74 if (node->rbaugmented == augmented) \
75 break; \
76 node->rbaugmented = augmented; \
77 rb = rb_parent(&node->rbfield); \
78 } \
79} \
80static inline void \
81rbname ## _copy(struct rb_node *rb_old, struct rb_node *rb_new) \
82{ \
83 rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
84 rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
85 new->rbaugmented = old->rbaugmented; \
86} \
87static void \
88rbname ## _rotate(struct rb_node *rb_old, struct rb_node *rb_new) \
89{ \
90 rbstruct *old = rb_entry(rb_old, rbstruct, rbfield); \
91 rbstruct *new = rb_entry(rb_new, rbstruct, rbfield); \
92 new->rbaugmented = old->rbaugmented; \
93 old->rbaugmented = rbcompute(old); \
94} \
95rbstatic const struct rb_augment_callbacks rbname = { \
96 rbname ## _propagate, rbname ## _copy, rbname ## _rotate \
97};
98
99
100#define RB_RED 0
101#define RB_BLACK 1
102
103#define __rb_parent(pc) ((struct rb_node *)(pc & ~3))
104
105#define __rb_color(pc) ((pc) & 1)
106#define __rb_is_black(pc) __rb_color(pc)
107#define __rb_is_red(pc) (!__rb_color(pc))
108#define rb_color(rb) __rb_color((rb)->__rb_parent_color)
109#define rb_is_red(rb) __rb_is_red((rb)->__rb_parent_color)
110#define rb_is_black(rb) __rb_is_black((rb)->__rb_parent_color)
111
112static inline void rb_set_parent(struct rb_node *rb, struct rb_node *p)
113{
114 rb->__rb_parent_color = rb_color(rb) | (unsigned long)p;
115}
116
117static inline void rb_set_parent_color(struct rb_node *rb,
118 struct rb_node *p, int color)
119{
120 rb->__rb_parent_color = (unsigned long)p | color;
121}
122
123static inline void
124__rb_change_child(struct rb_node *old, struct rb_node *new,
125 struct rb_node *parent, struct rb_root *root)
126{
127 if (parent) {
128 if (parent->rb_left == old)
129 parent->rb_left = new;
130 else
131 parent->rb_right = new;
132 } else
133 root->rb_node = new;
134}
135
136extern void __rb_erase_color(struct rb_node *parent, struct rb_root *root,
137 void (*augment_rotate)(struct rb_node *old, struct rb_node *new));
138
139static __always_inline struct rb_node *
140__rb_erase_augmented(struct rb_node *node, struct rb_root *root,
141 const struct rb_augment_callbacks *augment)
142{
143 struct rb_node *child = node->rb_right, *tmp = node->rb_left;
144 struct rb_node *parent, *rebalance;
145 unsigned long pc;
146
147 if (!tmp) {
148 /*
149 * Case 1: node to erase has no more than 1 child (easy!)
150 *
151 * Note that if there is one child it must be red due to 5)
152 * and node must be black due to 4). We adjust colors locally
153 * so as to bypass __rb_erase_color() later on.
154 */
155 pc = node->__rb_parent_color;
156 parent = __rb_parent(pc);
157 __rb_change_child(node, child, parent, root);
158 if (child) {
159 child->__rb_parent_color = pc;
160 rebalance = NULL;
161 } else
162 rebalance = __rb_is_black(pc) ? parent : NULL;
163 tmp = parent;
164 } else if (!child) {
165 /* Still case 1, but this time the child is node->rb_left */
166 tmp->__rb_parent_color = pc = node->__rb_parent_color;
167 parent = __rb_parent(pc);
168 __rb_change_child(node, tmp, parent, root);
169 rebalance = NULL;
170 tmp = parent;
171 } else {
172 struct rb_node *successor = child, *child2;
173 tmp = child->rb_left;
174 if (!tmp) {
175 /*
176 * Case 2: node's successor is its right child
177 *
178 * (n) (s)
179 * / \ / \
180 * (x) (s) -> (x) (c)
181 * \
182 * (c)
183 */
184 parent = successor;
185 child2 = successor->rb_right;
186 augment->copy(node, successor);
187 } else {
188 /*
189 * Case 3: node's successor is leftmost under
190 * node's right child subtree
191 *
192 * (n) (s)
193 * / \ / \
194 * (x) (y) -> (x) (y)
195 * / /
196 * (p) (p)
197 * / /
198 * (s) (c)
199 * \
200 * (c)
201 */
202 do {
203 parent = successor;
204 successor = tmp;
205 tmp = tmp->rb_left;
206 } while (tmp);
207 parent->rb_left = child2 = successor->rb_right;
208 successor->rb_right = child;
209 rb_set_parent(child, successor);
210 augment->copy(node, successor);
211 augment->propagate(parent, successor);
212 }
213
214 successor->rb_left = tmp = node->rb_left;
215 rb_set_parent(tmp, successor);
216
217 pc = node->__rb_parent_color;
218 tmp = __rb_parent(pc);
219 __rb_change_child(node, successor, tmp, root);
220 if (child2) {
221 successor->__rb_parent_color = pc;
222 rb_set_parent_color(child2, parent, RB_BLACK);
223 rebalance = NULL;
224 } else {
225 unsigned long pc2 = successor->__rb_parent_color;
226 successor->__rb_parent_color = pc;
227 rebalance = __rb_is_black(pc2) ? parent : NULL;
228 }
229 tmp = successor;
230 }
231
232 augment->propagate(tmp, NULL);
233 return rebalance;
234}
235
236static __always_inline void
237rb_erase_augmented(struct rb_node *node, struct rb_root *root,
238 const struct rb_augment_callbacks *augment)
239{
240 struct rb_node *rebalance = __rb_erase_augmented(node, root, augment);
241 if (rebalance)
242 __rb_erase_color(rebalance, root, augment->rotate);
243}
244
245#endif /* _TOOLS_LINUX_RBTREE_AUGMENTED_H */
diff --git a/tools/lib/rbtree.c b/tools/lib/rbtree.c
new file mode 100644
index 000000000000..17c2b596f043
--- /dev/null
+++ b/tools/lib/rbtree.c
@@ -0,0 +1,548 @@
1/*
2 Red Black Trees
3 (C) 1999 Andrea Arcangeli <andrea@suse.de>
4 (C) 2002 David Woodhouse <dwmw2@infradead.org>
5 (C) 2012 Michel Lespinasse <walken@google.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20
21 linux/lib/rbtree.c
22*/
23
24#include <linux/rbtree_augmented.h>
25
26/*
27 * red-black trees properties: http://en.wikipedia.org/wiki/Rbtree
28 *
29 * 1) A node is either red or black
30 * 2) The root is black
31 * 3) All leaves (NULL) are black
32 * 4) Both children of every red node are black
33 * 5) Every simple path from root to leaves contains the same number
34 * of black nodes.
35 *
36 * 4 and 5 give the O(log n) guarantee, since 4 implies you cannot have two
37 * consecutive red nodes in a path and every red node is therefore followed by
38 * a black. So if B is the number of black nodes on every simple path (as per
39 * 5), then the longest possible path due to 4 is 2B.
40 *
41 * We shall indicate color with case, where black nodes are uppercase and red
42 * nodes will be lowercase. Unknown color nodes shall be drawn as red within
43 * parentheses and have some accompanying text comment.
44 */
45
46static inline void rb_set_black(struct rb_node *rb)
47{
48 rb->__rb_parent_color |= RB_BLACK;
49}
50
51static inline struct rb_node *rb_red_parent(struct rb_node *red)
52{
53 return (struct rb_node *)red->__rb_parent_color;
54}
55
56/*
57 * Helper function for rotations:
58 * - old's parent and color get assigned to new
59 * - old gets assigned new as a parent and 'color' as a color.
60 */
61static inline void
62__rb_rotate_set_parents(struct rb_node *old, struct rb_node *new,
63 struct rb_root *root, int color)
64{
65 struct rb_node *parent = rb_parent(old);
66 new->__rb_parent_color = old->__rb_parent_color;
67 rb_set_parent_color(old, new, color);
68 __rb_change_child(old, new, parent, root);
69}
70
71static __always_inline void
72__rb_insert(struct rb_node *node, struct rb_root *root,
73 void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
74{
75 struct rb_node *parent = rb_red_parent(node), *gparent, *tmp;
76
77 while (true) {
78 /*
79 * Loop invariant: node is red
80 *
81 * If there is a black parent, we are done.
82 * Otherwise, take some corrective action as we don't
83 * want a red root or two consecutive red nodes.
84 */
85 if (!parent) {
86 rb_set_parent_color(node, NULL, RB_BLACK);
87 break;
88 } else if (rb_is_black(parent))
89 break;
90
91 gparent = rb_red_parent(parent);
92
93 tmp = gparent->rb_right;
94 if (parent != tmp) { /* parent == gparent->rb_left */
95 if (tmp && rb_is_red(tmp)) {
96 /*
97 * Case 1 - color flips
98 *
99 * G g
100 * / \ / \
101 * p u --> P U
102 * / /
103 * n n
104 *
105 * However, since g's parent might be red, and
106 * 4) does not allow this, we need to recurse
107 * at g.
108 */
109 rb_set_parent_color(tmp, gparent, RB_BLACK);
110 rb_set_parent_color(parent, gparent, RB_BLACK);
111 node = gparent;
112 parent = rb_parent(node);
113 rb_set_parent_color(node, parent, RB_RED);
114 continue;
115 }
116
117 tmp = parent->rb_right;
118 if (node == tmp) {
119 /*
120 * Case 2 - left rotate at parent
121 *
122 * G G
123 * / \ / \
124 * p U --> n U
125 * \ /
126 * n p
127 *
128 * This still leaves us in violation of 4), the
129 * continuation into Case 3 will fix that.
130 */
131 parent->rb_right = tmp = node->rb_left;
132 node->rb_left = parent;
133 if (tmp)
134 rb_set_parent_color(tmp, parent,
135 RB_BLACK);
136 rb_set_parent_color(parent, node, RB_RED);
137 augment_rotate(parent, node);
138 parent = node;
139 tmp = node->rb_right;
140 }
141
142 /*
143 * Case 3 - right rotate at gparent
144 *
145 * G P
146 * / \ / \
147 * p U --> n g
148 * / \
149 * n U
150 */
151 gparent->rb_left = tmp; /* == parent->rb_right */
152 parent->rb_right = gparent;
153 if (tmp)
154 rb_set_parent_color(tmp, gparent, RB_BLACK);
155 __rb_rotate_set_parents(gparent, parent, root, RB_RED);
156 augment_rotate(gparent, parent);
157 break;
158 } else {
159 tmp = gparent->rb_left;
160 if (tmp && rb_is_red(tmp)) {
161 /* Case 1 - color flips */
162 rb_set_parent_color(tmp, gparent, RB_BLACK);
163 rb_set_parent_color(parent, gparent, RB_BLACK);
164 node = gparent;
165 parent = rb_parent(node);
166 rb_set_parent_color(node, parent, RB_RED);
167 continue;
168 }
169
170 tmp = parent->rb_left;
171 if (node == tmp) {
172 /* Case 2 - right rotate at parent */
173 parent->rb_left = tmp = node->rb_right;
174 node->rb_right = parent;
175 if (tmp)
176 rb_set_parent_color(tmp, parent,
177 RB_BLACK);
178 rb_set_parent_color(parent, node, RB_RED);
179 augment_rotate(parent, node);
180 parent = node;
181 tmp = node->rb_left;
182 }
183
184 /* Case 3 - left rotate at gparent */
185 gparent->rb_right = tmp; /* == parent->rb_left */
186 parent->rb_left = gparent;
187 if (tmp)
188 rb_set_parent_color(tmp, gparent, RB_BLACK);
189 __rb_rotate_set_parents(gparent, parent, root, RB_RED);
190 augment_rotate(gparent, parent);
191 break;
192 }
193 }
194}
195
196/*
197 * Inline version for rb_erase() use - we want to be able to inline
198 * and eliminate the dummy_rotate callback there
199 */
200static __always_inline void
201____rb_erase_color(struct rb_node *parent, struct rb_root *root,
202 void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
203{
204 struct rb_node *node = NULL, *sibling, *tmp1, *tmp2;
205
206 while (true) {
207 /*
208 * Loop invariants:
209 * - node is black (or NULL on first iteration)
210 * - node is not the root (parent is not NULL)
211 * - All leaf paths going through parent and node have a
212 * black node count that is 1 lower than other leaf paths.
213 */
214 sibling = parent->rb_right;
215 if (node != sibling) { /* node == parent->rb_left */
216 if (rb_is_red(sibling)) {
217 /*
218 * Case 1 - left rotate at parent
219 *
220 * P S
221 * / \ / \
222 * N s --> p Sr
223 * / \ / \
224 * Sl Sr N Sl
225 */
226 parent->rb_right = tmp1 = sibling->rb_left;
227 sibling->rb_left = parent;
228 rb_set_parent_color(tmp1, parent, RB_BLACK);
229 __rb_rotate_set_parents(parent, sibling, root,
230 RB_RED);
231 augment_rotate(parent, sibling);
232 sibling = tmp1;
233 }
234 tmp1 = sibling->rb_right;
235 if (!tmp1 || rb_is_black(tmp1)) {
236 tmp2 = sibling->rb_left;
237 if (!tmp2 || rb_is_black(tmp2)) {
238 /*
239 * Case 2 - sibling color flip
240 * (p could be either color here)
241 *
242 * (p) (p)
243 * / \ / \
244 * N S --> N s
245 * / \ / \
246 * Sl Sr Sl Sr
247 *
248 * This leaves us violating 5) which
249 * can be fixed by flipping p to black
250 * if it was red, or by recursing at p.
251 * p is red when coming from Case 1.
252 */
253 rb_set_parent_color(sibling, parent,
254 RB_RED);
255 if (rb_is_red(parent))
256 rb_set_black(parent);
257 else {
258 node = parent;
259 parent = rb_parent(node);
260 if (parent)
261 continue;
262 }
263 break;
264 }
265 /*
266 * Case 3 - right rotate at sibling
267 * (p could be either color here)
268 *
269 * (p) (p)
270 * / \ / \
271 * N S --> N Sl
272 * / \ \
273 * sl Sr s
274 * \
275 * Sr
276 */
277 sibling->rb_left = tmp1 = tmp2->rb_right;
278 tmp2->rb_right = sibling;
279 parent->rb_right = tmp2;
280 if (tmp1)
281 rb_set_parent_color(tmp1, sibling,
282 RB_BLACK);
283 augment_rotate(sibling, tmp2);
284 tmp1 = sibling;
285 sibling = tmp2;
286 }
287 /*
288 * Case 4 - left rotate at parent + color flips
289 * (p and sl could be either color here.
290 * After rotation, p becomes black, s acquires
291 * p's color, and sl keeps its color)
292 *
293 * (p) (s)
294 * / \ / \
295 * N S --> P Sr
296 * / \ / \
297 * (sl) sr N (sl)
298 */
299 parent->rb_right = tmp2 = sibling->rb_left;
300 sibling->rb_left = parent;
301 rb_set_parent_color(tmp1, sibling, RB_BLACK);
302 if (tmp2)
303 rb_set_parent(tmp2, parent);
304 __rb_rotate_set_parents(parent, sibling, root,
305 RB_BLACK);
306 augment_rotate(parent, sibling);
307 break;
308 } else {
309 sibling = parent->rb_left;
310 if (rb_is_red(sibling)) {
311 /* Case 1 - right rotate at parent */
312 parent->rb_left = tmp1 = sibling->rb_right;
313 sibling->rb_right = parent;
314 rb_set_parent_color(tmp1, parent, RB_BLACK);
315 __rb_rotate_set_parents(parent, sibling, root,
316 RB_RED);
317 augment_rotate(parent, sibling);
318 sibling = tmp1;
319 }
320 tmp1 = sibling->rb_left;
321 if (!tmp1 || rb_is_black(tmp1)) {
322 tmp2 = sibling->rb_right;
323 if (!tmp2 || rb_is_black(tmp2)) {
324 /* Case 2 - sibling color flip */
325 rb_set_parent_color(sibling, parent,
326 RB_RED);
327 if (rb_is_red(parent))
328 rb_set_black(parent);
329 else {
330 node = parent;
331 parent = rb_parent(node);
332 if (parent)
333 continue;
334 }
335 break;
336 }
337 /* Case 3 - right rotate at sibling */
338 sibling->rb_right = tmp1 = tmp2->rb_left;
339 tmp2->rb_left = sibling;
340 parent->rb_left = tmp2;
341 if (tmp1)
342 rb_set_parent_color(tmp1, sibling,
343 RB_BLACK);
344 augment_rotate(sibling, tmp2);
345 tmp1 = sibling;
346 sibling = tmp2;
347 }
348 /* Case 4 - left rotate at parent + color flips */
349 parent->rb_left = tmp2 = sibling->rb_right;
350 sibling->rb_right = parent;
351 rb_set_parent_color(tmp1, sibling, RB_BLACK);
352 if (tmp2)
353 rb_set_parent(tmp2, parent);
354 __rb_rotate_set_parents(parent, sibling, root,
355 RB_BLACK);
356 augment_rotate(parent, sibling);
357 break;
358 }
359 }
360}
361
362/* Non-inline version for rb_erase_augmented() use */
363void __rb_erase_color(struct rb_node *parent, struct rb_root *root,
364 void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
365{
366 ____rb_erase_color(parent, root, augment_rotate);
367}
368
369/*
370 * Non-augmented rbtree manipulation functions.
371 *
372 * We use dummy augmented callbacks here, and have the compiler optimize them
373 * out of the rb_insert_color() and rb_erase() function definitions.
374 */
375
376static inline void dummy_propagate(struct rb_node *node, struct rb_node *stop) {}
377static inline void dummy_copy(struct rb_node *old, struct rb_node *new) {}
378static inline void dummy_rotate(struct rb_node *old, struct rb_node *new) {}
379
380static const struct rb_augment_callbacks dummy_callbacks = {
381 dummy_propagate, dummy_copy, dummy_rotate
382};
383
384void rb_insert_color(struct rb_node *node, struct rb_root *root)
385{
386 __rb_insert(node, root, dummy_rotate);
387}
388
389void rb_erase(struct rb_node *node, struct rb_root *root)
390{
391 struct rb_node *rebalance;
392 rebalance = __rb_erase_augmented(node, root, &dummy_callbacks);
393 if (rebalance)
394 ____rb_erase_color(rebalance, root, dummy_rotate);
395}
396
397/*
398 * Augmented rbtree manipulation functions.
399 *
400 * This instantiates the same __always_inline functions as in the non-augmented
401 * case, but this time with user-defined callbacks.
402 */
403
404void __rb_insert_augmented(struct rb_node *node, struct rb_root *root,
405 void (*augment_rotate)(struct rb_node *old, struct rb_node *new))
406{
407 __rb_insert(node, root, augment_rotate);
408}
409
410/*
411 * This function returns the first node (in sort order) of the tree.
412 */
413struct rb_node *rb_first(const struct rb_root *root)
414{
415 struct rb_node *n;
416
417 n = root->rb_node;
418 if (!n)
419 return NULL;
420 while (n->rb_left)
421 n = n->rb_left;
422 return n;
423}
424
425struct rb_node *rb_last(const struct rb_root *root)
426{
427 struct rb_node *n;
428
429 n = root->rb_node;
430 if (!n)
431 return NULL;
432 while (n->rb_right)
433 n = n->rb_right;
434 return n;
435}
436
437struct rb_node *rb_next(const struct rb_node *node)
438{
439 struct rb_node *parent;
440
441 if (RB_EMPTY_NODE(node))
442 return NULL;
443
444 /*
445 * If we have a right-hand child, go down and then left as far
446 * as we can.
447 */
448 if (node->rb_right) {
449 node = node->rb_right;
450 while (node->rb_left)
451 node=node->rb_left;
452 return (struct rb_node *)node;
453 }
454
455 /*
456 * No right-hand children. Everything down and left is smaller than us,
457 * so any 'next' node must be in the general direction of our parent.
458 * Go up the tree; any time the ancestor is a right-hand child of its
459 * parent, keep going up. First time it's a left-hand child of its
460 * parent, said parent is our 'next' node.
461 */
462 while ((parent = rb_parent(node)) && node == parent->rb_right)
463 node = parent;
464
465 return parent;
466}
467
468struct rb_node *rb_prev(const struct rb_node *node)
469{
470 struct rb_node *parent;
471
472 if (RB_EMPTY_NODE(node))
473 return NULL;
474
475 /*
476 * If we have a left-hand child, go down and then right as far
477 * as we can.
478 */
479 if (node->rb_left) {
480 node = node->rb_left;
481 while (node->rb_right)
482 node=node->rb_right;
483 return (struct rb_node *)node;
484 }
485
486 /*
487 * No left-hand children. Go up till we find an ancestor which
488 * is a right-hand child of its parent.
489 */
490 while ((parent = rb_parent(node)) && node == parent->rb_left)
491 node = parent;
492
493 return parent;
494}
495
496void rb_replace_node(struct rb_node *victim, struct rb_node *new,
497 struct rb_root *root)
498{
499 struct rb_node *parent = rb_parent(victim);
500
501 /* Set the surrounding nodes to point to the replacement */
502 __rb_change_child(victim, new, parent, root);
503 if (victim->rb_left)
504 rb_set_parent(victim->rb_left, new);
505 if (victim->rb_right)
506 rb_set_parent(victim->rb_right, new);
507
508 /* Copy the pointers/colour from the victim to the replacement */
509 *new = *victim;
510}
511
512static struct rb_node *rb_left_deepest_node(const struct rb_node *node)
513{
514 for (;;) {
515 if (node->rb_left)
516 node = node->rb_left;
517 else if (node->rb_right)
518 node = node->rb_right;
519 else
520 return (struct rb_node *)node;
521 }
522}
523
524struct rb_node *rb_next_postorder(const struct rb_node *node)
525{
526 const struct rb_node *parent;
527 if (!node)
528 return NULL;
529 parent = rb_parent(node);
530
531 /* If we're sitting on node, we've already seen our children */
532 if (parent && node == parent->rb_left && parent->rb_right) {
533 /* If we are the parent's left node, go to the parent's right
534 * node then all the way down to the left */
535 return rb_left_deepest_node(parent->rb_right);
536 } else
537 /* Otherwise we are the parent's right node, and the parent
538 * should be next */
539 return (struct rb_node *)parent;
540}
541
542struct rb_node *rb_first_postorder(const struct rb_root *root)
543{
544 if (!root->rb_node)
545 return NULL;
546
547 return rb_left_deepest_node(root->rb_node);
548}
diff --git a/tools/perf/MANIFEST b/tools/perf/MANIFEST
index fe50a1b34aa0..09dc0aabb515 100644
--- a/tools/perf/MANIFEST
+++ b/tools/perf/MANIFEST
@@ -18,6 +18,7 @@ tools/arch/x86/include/asm/atomic.h
18tools/arch/x86/include/asm/rmwcc.h 18tools/arch/x86/include/asm/rmwcc.h
19tools/lib/traceevent 19tools/lib/traceevent
20tools/lib/api 20tools/lib/api
21tools/lib/rbtree.c
21tools/lib/symbol/kallsyms.c 22tools/lib/symbol/kallsyms.c
22tools/lib/symbol/kallsyms.h 23tools/lib/symbol/kallsyms.h
23tools/lib/util/find_next_bit.c 24tools/lib/util/find_next_bit.c
@@ -44,6 +45,8 @@ tools/include/linux/kernel.h
44tools/include/linux/list.h 45tools/include/linux/list.h
45tools/include/linux/log2.h 46tools/include/linux/log2.h
46tools/include/linux/poison.h 47tools/include/linux/poison.h
48tools/include/linux/rbtree.h
49tools/include/linux/rbtree_augmented.h
47tools/include/linux/types.h 50tools/include/linux/types.h
48include/asm-generic/bitops/arch_hweight.h 51include/asm-generic/bitops/arch_hweight.h
49include/asm-generic/bitops/const_hweight.h 52include/asm-generic/bitops/const_hweight.h
@@ -51,12 +54,10 @@ include/asm-generic/bitops/fls64.h
51include/asm-generic/bitops/__fls.h 54include/asm-generic/bitops/__fls.h
52include/asm-generic/bitops/fls.h 55include/asm-generic/bitops/fls.h
53include/linux/perf_event.h 56include/linux/perf_event.h
54include/linux/rbtree.h
55include/linux/list.h 57include/linux/list.h
56include/linux/hash.h 58include/linux/hash.h
57include/linux/stringify.h 59include/linux/stringify.h
58lib/hweight.c 60lib/hweight.c
59lib/rbtree.c
60include/linux/swab.h 61include/linux/swab.h
61arch/*/include/asm/unistd*.h 62arch/*/include/asm/unistd*.h
62arch/*/include/uapi/asm/unistd*.h 63arch/*/include/uapi/asm/unistd*.h
@@ -65,7 +66,6 @@ arch/*/lib/memcpy*.S
65arch/*/lib/memset*.S 66arch/*/lib/memset*.S
66include/linux/poison.h 67include/linux/poison.h
67include/linux/hw_breakpoint.h 68include/linux/hw_breakpoint.h
68include/linux/rbtree_augmented.h
69include/uapi/linux/perf_event.h 69include/uapi/linux/perf_event.h
70include/uapi/linux/const.h 70include/uapi/linux/const.h
71include/uapi/linux/swab.h 71include/uapi/linux/swab.h
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 586a59d46022..601d11440596 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -139,7 +139,7 @@ $(OUTPUT)util/find_next_bit.o: ../lib/util/find_next_bit.c FORCE
139 $(call rule_mkdir) 139 $(call rule_mkdir)
140 $(call if_changed_dep,cc_o_c) 140 $(call if_changed_dep,cc_o_c)
141 141
142$(OUTPUT)util/rbtree.o: ../../lib/rbtree.c FORCE 142$(OUTPUT)util/rbtree.o: ../lib/rbtree.c FORCE
143 $(call rule_mkdir) 143 $(call rule_mkdir)
144 $(call if_changed_dep,cc_o_c) 144 $(call if_changed_dep,cc_o_c)
145 145
diff --git a/tools/perf/util/include/linux/rbtree.h b/tools/perf/util/include/linux/rbtree.h
deleted file mode 100644
index f06d89f0b867..000000000000
--- a/tools/perf/util/include/linux/rbtree.h
+++ /dev/null
@@ -1,16 +0,0 @@
1#ifndef __TOOLS_LINUX_PERF_RBTREE_H
2#define __TOOLS_LINUX_PERF_RBTREE_H
3#include <stdbool.h>
4#include "../../../../include/linux/rbtree.h"
5
6/*
7 * Handy for checking that we are not deleting an entry that is
8 * already in a list, found in block/{blk-throttle,cfq-iosched}.c,
9 * probably should be moved to lib/rbtree.c...
10 */
11static inline void rb_erase_init(struct rb_node *n, struct rb_root *root)
12{
13 rb_erase(n, root);
14 RB_CLEAR_NODE(n);
15}
16#endif /* __TOOLS_LINUX_PERF_RBTREE_H */
diff --git a/tools/perf/util/include/linux/rbtree_augmented.h b/tools/perf/util/include/linux/rbtree_augmented.h
deleted file mode 100644
index 9d6fcdf1788b..000000000000
--- a/tools/perf/util/include/linux/rbtree_augmented.h
+++ /dev/null
@@ -1,2 +0,0 @@
1#include <stdbool.h>
2#include "../../../../include/linux/rbtree_augmented.h"
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 12:10:24 -0500