arch/mips/kernel/perf_event.c

Source file repositories/reference/linux-study-clean/arch/mips/kernel/perf_event.c

File Facts

System
Linux kernel
Corpus path
arch/mips/kernel/perf_event.c
Extension
.c
Size
1737 bytes
Lines
68
Domain
Architecture Layer
Bucket
arch/mips
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

if (__kernel_text_address(addr)) {
			perf_callchain_store(entry, addr);
			if (entry->nr >= entry->max_stack)
				break;
		}
	}
}

void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
			   struct pt_regs *regs)
{
	unsigned long sp = regs->regs[29];
#ifdef CONFIG_KALLSYMS
	unsigned long ra = regs->regs[31];
	unsigned long pc = regs->cp0_epc;

	if (raw_show_trace || !__kernel_text_address(pc)) {
		unsigned long stack_page =
			(unsigned long)task_stack_page(current);
		if (stack_page && sp >= stack_page &&
		    sp <= stack_page + THREAD_SIZE - 32)
			save_raw_perf_callchain(entry, sp);
		return;
	}
	do {
		perf_callchain_store(entry, pc);
		if (entry->nr >= entry->max_stack)
			break;
		pc = unwind_stack(current, &sp, pc, &ra);
	} while (pc);
#else
	save_raw_perf_callchain(entry, sp);
#endif
}

Annotation

Implementation Notes