tools/perf/util/sharded_mutex.h

File Facts

System

Linux kernel

Corpus path

tools/perf/util/sharded_mutex.h

Extension

.h

Size

922 bytes

Lines

30

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.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• mutex.h
• hashmap.h

Detected Declarations

• struct sharded_mutex

Annotated Snippet

struct sharded_mutex {
	/* mutexes array is 1<<cap_bits in size. */
	unsigned int cap_bits;
	struct mutex mutexes[];
};

struct sharded_mutex *sharded_mutex__new(size_t num_shards);
void sharded_mutex__delete(struct sharded_mutex *sm);

static inline struct mutex *sharded_mutex__get_mutex(struct sharded_mutex *sm, size_t hash)
{
	return &sm->mutexes[hash_bits(hash, sm->cap_bits)];
}

#endif  /* PERF_SHARDED_MUTEX_H */

Annotation

• Immediate include surface: `mutex.h`, `hashmap.h`.
• Detected declarations: `struct sharded_mutex`.
• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.