tools/perf/util/lock-contention.c

Source file repositories/reference/linux-study-clean/tools/perf/util/lock-contention.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/lock-contention.c
Extension
.c
Size
3239 bytes
Lines
144
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct callstack_filter {
	struct list_head list;
	char name[];
};

static LIST_HEAD(callstack_filters);
struct hlist_head *lockhash_table;

int parse_call_stack(const struct option *opt __maybe_unused, const char *str,
		     int unset __maybe_unused)
{
	char *s, *tmp, *tok;
	int ret = 0;

	s = strdup(str);
	if (s == NULL)
		return -1;

	for (tok = strtok_r(s, ", ", &tmp); tok; tok = strtok_r(NULL, ", ", &tmp)) {
		struct callstack_filter *entry;

		entry = malloc(sizeof(*entry) + strlen(tok) + 1);
		if (entry == NULL) {
			pr_err("Memory allocation failure\n");
			free(s);
			return -1;
		}

		strcpy(entry->name, tok);
		list_add_tail(&entry->list, &callstack_filters);
	}

	free(s);
	return ret;
}

bool needs_callstack(void)
{
	return !list_empty(&callstack_filters);
}

struct lock_stat *lock_stat_find(u64 addr)
{
	struct hlist_head *entry = lockhashentry(addr);
	struct lock_stat *ret;

	hlist_for_each_entry(ret, entry, hash_entry) {
		if (ret->addr == addr)
			return ret;
	}
	return NULL;
}

struct lock_stat *lock_stat_findnew(u64 addr, const char *name, int flags)
{
	struct hlist_head *entry = lockhashentry(addr);
	struct lock_stat *ret, *new;

	hlist_for_each_entry(ret, entry, hash_entry) {
		if (ret->addr == addr)
			return ret;
	}

	new = zalloc(sizeof(struct lock_stat));
	if (!new)
		goto alloc_failed;

	new->addr = addr;
	new->name = strdup(name);
	if (!new->name) {
		free(new);
		goto alloc_failed;
	}

	new->flags = flags;
	new->wait_time_min = ULLONG_MAX;

	hlist_add_head(&new->hash_entry, entry);
	return new;

alloc_failed:
	pr_err("memory allocation failed\n");
	return NULL;
}

bool match_callstack_filter(struct machine *machine, u64 *callstack, int max_stack_depth)
{
	struct map *kmap;
	struct symbol *sym;
	u64 ip;

Annotation

Implementation Notes