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.

Dependency Surface

Detected Declarations

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

Implementation Notes