arch/powerpc/include/asm/cputime.h

Source file repositories/reference/linux-study-clean/arch/powerpc/include/asm/cputime.h

File Facts

System
Linux kernel
Corpus path
arch/powerpc/include/asm/cputime.h
Extension
.h
Size
2278 bytes
Lines
88
Domain
Architecture Layer
Bucket
arch/powerpc
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

#ifndef __POWERPC_CPUTIME_H
#define __POWERPC_CPUTIME_H

#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE

#include <linux/types.h>
#include <linux/time.h>
#include <asm/div64.h>
#include <asm/time.h>
#include <asm/param.h>
#include <asm/firmware.h>

#ifdef __KERNEL__
#define cputime_to_nsecs(cputime) tb_to_ns(cputime)

/*
 * PPC64 uses PACA which is task independent for storing accounting data while
 * PPC32 uses struct thread_info, therefore at task switch the accounting data
 * has to be populated in the new task
 */
#ifdef CONFIG_PPC64
#define get_accounting(tsk)	(&get_paca()->accounting)
#define raw_get_accounting(tsk)	(&local_paca->accounting)

#else
#define get_accounting(tsk)	(&task_thread_info(tsk)->accounting)
#define raw_get_accounting(tsk)	get_accounting(tsk)
#endif

/*
 * account_cpu_user_entry/exit runs "unreconciled", so can't trace,
 * can't use get_paca()
 */
static notrace inline void account_cpu_user_entry(void)
{
	unsigned long tb = mftb();
	struct cpu_accounting_data *acct = raw_get_accounting(current);

	acct->utime += (tb - acct->starttime_user);
	acct->starttime = tb;
}

static notrace inline void account_cpu_user_exit(void)
{
	unsigned long tb = mftb();
	struct cpu_accounting_data *acct = raw_get_accounting(current);

	acct->stime += (tb - acct->starttime);
	acct->starttime_user = tb;
}

static notrace inline void account_stolen_time(void)
{
#ifdef CONFIG_PPC_SPLPAR
	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
		struct lppaca *lp = local_paca->lppaca_ptr;

		if (unlikely(local_paca->dtl_ridx != be64_to_cpu(lp->dtl_idx)))
			pseries_accumulate_stolen_time();
	}
#endif
}

#endif /* __KERNEL__ */
#else /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
static inline void account_cpu_user_entry(void)
{
}
static inline void account_cpu_user_exit(void)
{
}
static notrace inline void account_stolen_time(void)
{
}
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
#endif /* __POWERPC_CPUTIME_H */

Annotation

Implementation Notes