tools/perf/util/cacheline.c
Source file repositories/reference/linux-study-clean/tools/perf/util/cacheline.c
File Facts
- System
- Linux kernel
- Corpus path
tools/perf/util/cacheline.c- Extension
.c- Size
- 568 bytes
- Lines
- 26
- 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.
Dependency Surface
cacheline.hunistd.hapi/fs/fs.hdebug.h
Detected Declarations
function cache_line_sizefunction cacheline_size
Annotated Snippet
// SPDX-License-Identifier: GPL-2.0
#include "cacheline.h"
#include <unistd.h>
#ifdef _SC_LEVEL1_DCACHE_LINESIZE
#define cache_line_size(cacheline_sizep) *cacheline_sizep = sysconf(_SC_LEVEL1_DCACHE_LINESIZE)
#else
#include <api/fs/fs.h>
#include "debug.h"
static void cache_line_size(int *cacheline_sizep)
{
if (sysfs__read_int("devices/system/cpu/cpu0/cache/index0/coherency_line_size", cacheline_sizep))
pr_debug("cannot determine cache line size");
}
#endif
int cacheline_size(void)
{
static int size;
if (!size)
cache_line_size(&size);
return size;
}
Annotation
- Immediate include surface: `cacheline.h`, `unistd.h`, `api/fs/fs.h`, `debug.h`.
- Detected declarations: `function cache_line_size`, `function cacheline_size`.
- 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.