summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/comm.c
blob: b2bb59df65e10c10cfe6dd1aacb495d4804a6a4f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
#include "comm.h"
#include "util.h"
#include <stdlib.h>
#include <stdio.h>

struct comm_str {
	char *str;
	struct rb_node rb_node;
	int ref;
};

/* Should perhaps be moved to struct machine */
static struct rb_root comm_str_root;

static void comm_str__get(struct comm_str *cs)
{
	cs->ref++;
}

static void comm_str__put(struct comm_str *cs)
{
	if (!--cs->ref) {
		rb_erase(&cs->rb_node, &comm_str_root);
		zfree(&cs->str);
		free(cs);
	}
}

static struct comm_str *comm_str__alloc(const char *str)
{
	struct comm_str *cs;

	cs = zalloc(sizeof(*cs));
	if (!cs)
		return NULL;

	cs->str = strdup(str);
	if (!cs->str) {
		free(cs);
		return NULL;
	}

	return cs;
}

static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root)
{
	struct rb_node **p = &root->rb_node;
	struct rb_node *parent = NULL;
	struct comm_str *iter, *new;
	int cmp;

	while (*p != NULL) {
		parent = *p;
		iter = rb_entry(parent, struct comm_str, rb_node);

		cmp = strcmp(str, iter->str);
		if (!cmp)
			return iter;

		if (cmp < 0)
			p = &(*p)->rb_left;
		else
			p = &(*p)->rb_right;
	}

	new = comm_str__alloc(str);
	if (!new)
		return NULL;

	rb_link_node(&new->rb_node, parent, p);
	rb_insert_color(&new->rb_node, root);

	return new;
}

struct comm *comm__new(const char *str, u64 timestamp, bool exec)
{
	struct comm *comm = zalloc(sizeof(*comm));

	if (!comm)
		return NULL;

	comm->start = timestamp;
	comm->exec = exec;

	comm->comm_str = comm_str__findnew(str, &comm_str_root);
	if (!comm->comm_str) {
		free(comm);
		return NULL;
	}

	comm_str__get(comm->comm_str);

	return comm;
}

int comm__override(struct comm *comm, const char *str, u64 timestamp, bool exec)
{
	struct comm_str *new, *old = comm->comm_str;

	new = comm_str__findnew(str, &comm_str_root);
	if (!new)
		return -ENOMEM;

	comm_str__get(new);
	comm_str__put(old);
	comm->comm_str = new;
	comm->start = timestamp;
	if (exec)
		comm->exec = true;

	return 0;
}

void comm__free(struct comm *comm)
{
	comm_str__put(comm->comm_str);
	free(comm);
}

const char *comm__str(const struct comm *comm)
{
	return comm->comm_str->str;
}