arch/x86/kernel/trace_clock.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/trace_clock.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/trace_clock.c
Extension
.c
Size
338 bytes
Lines
18
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * X86 trace clocks
 */
#include <asm/trace_clock.h>
#include <asm/barrier.h>
#include <asm/tsc.h>

/*
 * trace_clock_x86_tsc(): A clock that is just the cycle counter.
 *
 * Unlike the other clocks, this is not in nanoseconds.
 */
u64 notrace trace_clock_x86_tsc(void)
{
	return rdtsc_ordered();
}

Annotation

Implementation Notes