Release 4.14 tools/perf/util/comm.c

// SPDX-License-Identifier: GPL-2.0
#include "comm.h"
#include "util.h"
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <linux/refcount.h>


struct comm_str {
	
char *str;
	
struct rb_node rb_node;
	
refcount_t refcnt;
};

/* Should perhaps be moved to struct machine */

static struct rb_root comm_str_root;



static struct comm_str *comm_str__get(struct comm_str *cs)
{
	if (cs)
		refcount_inc(&cs->refcnt);
	return cs;
}

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28
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static void comm_str__put(struct comm_str *cs)
{
	if (cs && refcount_dec_and_test(&cs->refcnt)) {
		rb_erase(&cs->rb_node, &comm_str_root);
		zfree(&cs->str);
		free(cs);
	}
}

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2.04%
1
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49
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4
100.00%



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;
	}

	refcount_set(&cs->refcnt, 1);

	return cs;
}

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2
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76
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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 comm_str__get(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;
}

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2
100.00%



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;
	}

	return comm;
}

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100.00%



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

	return 0;
}

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1
33.33%
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82
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3
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void comm__free(struct comm *comm)
{
	comm_str__put(comm->comm_str);
	free(comm);
}

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const char *comm__str(const struct comm *comm)
{
	return comm->comm_str->str;
}
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20
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100.00%
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20
100.00%
1
100.00%

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446
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20.00%
Namhyung Kim
50
8.82%
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10.00%
Arnaldo Carvalho de Melo
39
6.88%
4
40.00%
Adrian Hunter
22
3.88%
1
10.00%
Elena Reshetova
9
1.59%
1
10.00%
Greg Kroah-Hartman
1
0.18%
1
10.00%
Total
567
100.00%
10
100.00%
Directory: tools/perf/util

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