mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
315cc066b8
Add RB_DECLARE_CALLBACKS_MAX, which generates augmented rbtree callbacks for the case where the augmented value is a scalar whose definition follows a max(f(node)) pattern. This actually covers all present uses of RB_DECLARE_CALLBACKS, and saves some (source) code duplication in the various RBCOMPUTE function definitions. [walken@google.com: fix mm/vmalloc.c] Link: http://lkml.kernel.org/r/CANN689FXgK13wDYNh1zKxdipeTuALG4eKvKpsdZqKFJ-rvtGiQ@mail.gmail.com [walken@google.com: re-add check to check_augmented()] Link: http://lkml.kernel.org/r/20190727022027.GA86863@google.com Link: http://lkml.kernel.org/r/20190703040156.56953-3-walken@google.com Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David Howells <dhowells@redhat.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: Uladzislau Rezki <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
409 lines
9.4 KiB
C
409 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/rbtree_augmented.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/timex.h>
|
|
|
|
#define __param(type, name, init, msg) \
|
|
static type name = init; \
|
|
module_param(name, type, 0444); \
|
|
MODULE_PARM_DESC(name, msg);
|
|
|
|
__param(int, nnodes, 100, "Number of nodes in the rb-tree");
|
|
__param(int, perf_loops, 1000, "Number of iterations modifying the rb-tree");
|
|
__param(int, check_loops, 100, "Number of iterations modifying and verifying the rb-tree");
|
|
|
|
struct test_node {
|
|
u32 key;
|
|
struct rb_node rb;
|
|
|
|
/* following fields used for testing augmented rbtree functionality */
|
|
u32 val;
|
|
u32 augmented;
|
|
};
|
|
|
|
static struct rb_root_cached root = RB_ROOT_CACHED;
|
|
static struct test_node *nodes = NULL;
|
|
|
|
static struct rnd_state rnd;
|
|
|
|
static void insert(struct test_node *node, struct rb_root_cached *root)
|
|
{
|
|
struct rb_node **new = &root->rb_root.rb_node, *parent = NULL;
|
|
u32 key = node->key;
|
|
|
|
while (*new) {
|
|
parent = *new;
|
|
if (key < rb_entry(parent, struct test_node, rb)->key)
|
|
new = &parent->rb_left;
|
|
else
|
|
new = &parent->rb_right;
|
|
}
|
|
|
|
rb_link_node(&node->rb, parent, new);
|
|
rb_insert_color(&node->rb, &root->rb_root);
|
|
}
|
|
|
|
static void insert_cached(struct test_node *node, struct rb_root_cached *root)
|
|
{
|
|
struct rb_node **new = &root->rb_root.rb_node, *parent = NULL;
|
|
u32 key = node->key;
|
|
bool leftmost = true;
|
|
|
|
while (*new) {
|
|
parent = *new;
|
|
if (key < rb_entry(parent, struct test_node, rb)->key)
|
|
new = &parent->rb_left;
|
|
else {
|
|
new = &parent->rb_right;
|
|
leftmost = false;
|
|
}
|
|
}
|
|
|
|
rb_link_node(&node->rb, parent, new);
|
|
rb_insert_color_cached(&node->rb, root, leftmost);
|
|
}
|
|
|
|
static inline void erase(struct test_node *node, struct rb_root_cached *root)
|
|
{
|
|
rb_erase(&node->rb, &root->rb_root);
|
|
}
|
|
|
|
static inline void erase_cached(struct test_node *node, struct rb_root_cached *root)
|
|
{
|
|
rb_erase_cached(&node->rb, root);
|
|
}
|
|
|
|
|
|
#define NODE_VAL(node) ((node)->val)
|
|
|
|
RB_DECLARE_CALLBACKS_MAX(static, augment_callbacks,
|
|
struct test_node, rb, u32, augmented, NODE_VAL)
|
|
|
|
static void insert_augmented(struct test_node *node,
|
|
struct rb_root_cached *root)
|
|
{
|
|
struct rb_node **new = &root->rb_root.rb_node, *rb_parent = NULL;
|
|
u32 key = node->key;
|
|
u32 val = node->val;
|
|
struct test_node *parent;
|
|
|
|
while (*new) {
|
|
rb_parent = *new;
|
|
parent = rb_entry(rb_parent, struct test_node, rb);
|
|
if (parent->augmented < val)
|
|
parent->augmented = val;
|
|
if (key < parent->key)
|
|
new = &parent->rb.rb_left;
|
|
else
|
|
new = &parent->rb.rb_right;
|
|
}
|
|
|
|
node->augmented = val;
|
|
rb_link_node(&node->rb, rb_parent, new);
|
|
rb_insert_augmented(&node->rb, &root->rb_root, &augment_callbacks);
|
|
}
|
|
|
|
static void insert_augmented_cached(struct test_node *node,
|
|
struct rb_root_cached *root)
|
|
{
|
|
struct rb_node **new = &root->rb_root.rb_node, *rb_parent = NULL;
|
|
u32 key = node->key;
|
|
u32 val = node->val;
|
|
struct test_node *parent;
|
|
bool leftmost = true;
|
|
|
|
while (*new) {
|
|
rb_parent = *new;
|
|
parent = rb_entry(rb_parent, struct test_node, rb);
|
|
if (parent->augmented < val)
|
|
parent->augmented = val;
|
|
if (key < parent->key)
|
|
new = &parent->rb.rb_left;
|
|
else {
|
|
new = &parent->rb.rb_right;
|
|
leftmost = false;
|
|
}
|
|
}
|
|
|
|
node->augmented = val;
|
|
rb_link_node(&node->rb, rb_parent, new);
|
|
rb_insert_augmented_cached(&node->rb, root,
|
|
leftmost, &augment_callbacks);
|
|
}
|
|
|
|
|
|
static void erase_augmented(struct test_node *node, struct rb_root_cached *root)
|
|
{
|
|
rb_erase_augmented(&node->rb, &root->rb_root, &augment_callbacks);
|
|
}
|
|
|
|
static void erase_augmented_cached(struct test_node *node,
|
|
struct rb_root_cached *root)
|
|
{
|
|
rb_erase_augmented_cached(&node->rb, root, &augment_callbacks);
|
|
}
|
|
|
|
static void init(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < nnodes; i++) {
|
|
nodes[i].key = prandom_u32_state(&rnd);
|
|
nodes[i].val = prandom_u32_state(&rnd);
|
|
}
|
|
}
|
|
|
|
static bool is_red(struct rb_node *rb)
|
|
{
|
|
return !(rb->__rb_parent_color & 1);
|
|
}
|
|
|
|
static int black_path_count(struct rb_node *rb)
|
|
{
|
|
int count;
|
|
for (count = 0; rb; rb = rb_parent(rb))
|
|
count += !is_red(rb);
|
|
return count;
|
|
}
|
|
|
|
static void check_postorder_foreach(int nr_nodes)
|
|
{
|
|
struct test_node *cur, *n;
|
|
int count = 0;
|
|
rbtree_postorder_for_each_entry_safe(cur, n, &root.rb_root, rb)
|
|
count++;
|
|
|
|
WARN_ON_ONCE(count != nr_nodes);
|
|
}
|
|
|
|
static void check_postorder(int nr_nodes)
|
|
{
|
|
struct rb_node *rb;
|
|
int count = 0;
|
|
for (rb = rb_first_postorder(&root.rb_root); rb; rb = rb_next_postorder(rb))
|
|
count++;
|
|
|
|
WARN_ON_ONCE(count != nr_nodes);
|
|
}
|
|
|
|
static void check(int nr_nodes)
|
|
{
|
|
struct rb_node *rb;
|
|
int count = 0, blacks = 0;
|
|
u32 prev_key = 0;
|
|
|
|
for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) {
|
|
struct test_node *node = rb_entry(rb, struct test_node, rb);
|
|
WARN_ON_ONCE(node->key < prev_key);
|
|
WARN_ON_ONCE(is_red(rb) &&
|
|
(!rb_parent(rb) || is_red(rb_parent(rb))));
|
|
if (!count)
|
|
blacks = black_path_count(rb);
|
|
else
|
|
WARN_ON_ONCE((!rb->rb_left || !rb->rb_right) &&
|
|
blacks != black_path_count(rb));
|
|
prev_key = node->key;
|
|
count++;
|
|
}
|
|
|
|
WARN_ON_ONCE(count != nr_nodes);
|
|
WARN_ON_ONCE(count < (1 << black_path_count(rb_last(&root.rb_root))) - 1);
|
|
|
|
check_postorder(nr_nodes);
|
|
check_postorder_foreach(nr_nodes);
|
|
}
|
|
|
|
static void check_augmented(int nr_nodes)
|
|
{
|
|
struct rb_node *rb;
|
|
|
|
check(nr_nodes);
|
|
for (rb = rb_first(&root.rb_root); rb; rb = rb_next(rb)) {
|
|
struct test_node *node = rb_entry(rb, struct test_node, rb);
|
|
u32 subtree, max = node->val;
|
|
if (node->rb.rb_left) {
|
|
subtree = rb_entry(node->rb.rb_left, struct test_node,
|
|
rb)->augmented;
|
|
if (max < subtree)
|
|
max = subtree;
|
|
}
|
|
if (node->rb.rb_right) {
|
|
subtree = rb_entry(node->rb.rb_right, struct test_node,
|
|
rb)->augmented;
|
|
if (max < subtree)
|
|
max = subtree;
|
|
}
|
|
WARN_ON_ONCE(node->augmented != max);
|
|
}
|
|
}
|
|
|
|
static int __init rbtree_test_init(void)
|
|
{
|
|
int i, j;
|
|
cycles_t time1, time2, time;
|
|
struct rb_node *node;
|
|
|
|
nodes = kmalloc_array(nnodes, sizeof(*nodes), GFP_KERNEL);
|
|
if (!nodes)
|
|
return -ENOMEM;
|
|
|
|
printk(KERN_ALERT "rbtree testing");
|
|
|
|
prandom_seed_state(&rnd, 3141592653589793238ULL);
|
|
init();
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++) {
|
|
for (j = 0; j < nnodes; j++)
|
|
insert(nodes + j, &root);
|
|
for (j = 0; j < nnodes; j++)
|
|
erase(nodes + j, &root);
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n",
|
|
(unsigned long long)time);
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++) {
|
|
for (j = 0; j < nnodes; j++)
|
|
insert_cached(nodes + j, &root);
|
|
for (j = 0; j < nnodes; j++)
|
|
erase_cached(nodes + j, &root);
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 2 (latency of nnodes cached insert+delete): %llu cycles\n",
|
|
(unsigned long long)time);
|
|
|
|
for (i = 0; i < nnodes; i++)
|
|
insert(nodes + i, &root);
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++) {
|
|
for (node = rb_first(&root.rb_root); node; node = rb_next(node))
|
|
;
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 3 (latency of inorder traversal): %llu cycles\n",
|
|
(unsigned long long)time);
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++)
|
|
node = rb_first(&root.rb_root);
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 4 (latency to fetch first node)\n");
|
|
printk(" non-cached: %llu cycles\n", (unsigned long long)time);
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++)
|
|
node = rb_first_cached(&root);
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" cached: %llu cycles\n", (unsigned long long)time);
|
|
|
|
for (i = 0; i < nnodes; i++)
|
|
erase(nodes + i, &root);
|
|
|
|
/* run checks */
|
|
for (i = 0; i < check_loops; i++) {
|
|
init();
|
|
for (j = 0; j < nnodes; j++) {
|
|
check(j);
|
|
insert(nodes + j, &root);
|
|
}
|
|
for (j = 0; j < nnodes; j++) {
|
|
check(nnodes - j);
|
|
erase(nodes + j, &root);
|
|
}
|
|
check(0);
|
|
}
|
|
|
|
printk(KERN_ALERT "augmented rbtree testing");
|
|
|
|
init();
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++) {
|
|
for (j = 0; j < nnodes; j++)
|
|
insert_augmented(nodes + j, &root);
|
|
for (j = 0; j < nnodes; j++)
|
|
erase_augmented(nodes + j, &root);
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 1 (latency of nnodes insert+delete): %llu cycles\n", (unsigned long long)time);
|
|
|
|
time1 = get_cycles();
|
|
|
|
for (i = 0; i < perf_loops; i++) {
|
|
for (j = 0; j < nnodes; j++)
|
|
insert_augmented_cached(nodes + j, &root);
|
|
for (j = 0; j < nnodes; j++)
|
|
erase_augmented_cached(nodes + j, &root);
|
|
}
|
|
|
|
time2 = get_cycles();
|
|
time = time2 - time1;
|
|
|
|
time = div_u64(time, perf_loops);
|
|
printk(" -> test 2 (latency of nnodes cached insert+delete): %llu cycles\n", (unsigned long long)time);
|
|
|
|
for (i = 0; i < check_loops; i++) {
|
|
init();
|
|
for (j = 0; j < nnodes; j++) {
|
|
check_augmented(j);
|
|
insert_augmented(nodes + j, &root);
|
|
}
|
|
for (j = 0; j < nnodes; j++) {
|
|
check_augmented(nnodes - j);
|
|
erase_augmented(nodes + j, &root);
|
|
}
|
|
check_augmented(0);
|
|
}
|
|
|
|
kfree(nodes);
|
|
|
|
return -EAGAIN; /* Fail will directly unload the module */
|
|
}
|
|
|
|
static void __exit rbtree_test_exit(void)
|
|
{
|
|
printk(KERN_ALERT "test exit\n");
|
|
}
|
|
|
|
module_init(rbtree_test_init)
|
|
module_exit(rbtree_test_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Michel Lespinasse");
|
|
MODULE_DESCRIPTION("Red Black Tree test");
|