]>
git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - lib/interval_tree_test_main.c
1 #include <linux/module.h>
2 #include <linux/interval_tree.h>
3 #include <linux/random.h>
7 #define PERF_LOOPS 100000
9 #define SEARCH_LOOPS 10000
11 static struct rb_root root
= RB_ROOT
;
12 static struct interval_tree_node nodes
[NODES
];
13 static u32 queries
[SEARCHES
];
15 static struct rnd_state rnd
;
17 static inline unsigned long
18 search(unsigned long query
, struct rb_root
*root
)
20 struct interval_tree_node
*node
;
21 unsigned long results
= 0;
23 for (node
= interval_tree_iter_first(root
, query
, query
); node
;
24 node
= interval_tree_iter_next(node
, query
, query
))
29 static void init(void)
32 for (i
= 0; i
< NODES
; i
++) {
33 u32 a
= prandom_u32_state(&rnd
);
34 u32 b
= prandom_u32_state(&rnd
);
43 for (i
= 0; i
< SEARCHES
; i
++)
44 queries
[i
] = prandom_u32_state(&rnd
);
47 static int interval_tree_test_init(void)
50 unsigned long results
;
51 cycles_t time1
, time2
, time
;
53 printk(KERN_ALERT
"interval tree insert/remove");
55 prandom_seed_state(&rnd
, 3141592653589793238ULL);
60 for (i
= 0; i
< PERF_LOOPS
; i
++) {
61 for (j
= 0; j
< NODES
; j
++)
62 interval_tree_insert(nodes
+ j
, &root
);
63 for (j
= 0; j
< NODES
; j
++)
64 interval_tree_remove(nodes
+ j
, &root
);
70 time
= div_u64(time
, PERF_LOOPS
);
71 printk(" -> %llu cycles\n", (unsigned long long)time
);
73 printk(KERN_ALERT
"interval tree search");
75 for (j
= 0; j
< NODES
; j
++)
76 interval_tree_insert(nodes
+ j
, &root
);
81 for (i
= 0; i
< SEARCH_LOOPS
; i
++)
82 for (j
= 0; j
< SEARCHES
; j
++)
83 results
+= search(queries
[j
], &root
);
88 time
= div_u64(time
, SEARCH_LOOPS
);
89 results
= div_u64(results
, SEARCH_LOOPS
);
90 printk(" -> %llu cycles (%lu results)\n",
91 (unsigned long long)time
, results
);
93 return -EAGAIN
; /* Fail will directly unload the module */
96 static void interval_tree_test_exit(void)
98 printk(KERN_ALERT
"test exit\n");
101 module_init(interval_tree_test_init
)
102 module_exit(interval_tree_test_exit
)
104 MODULE_LICENSE("GPL");
105 MODULE_AUTHOR("Michel Lespinasse");
106 MODULE_DESCRIPTION("Interval Tree test");