2 * Definitions for measuring cputime on powerpc machines.
4 * Copyright (C) 2006 Paul Mackerras, IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
12 * the same units as the timebase. Otherwise we measure cpu time
13 * in jiffies using the generic definitions.
16 #ifndef __POWERPC_CPUTIME_H
17 #define __POWERPC_CPUTIME_H
19 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
21 #include <linux/types.h>
22 #include <linux/time.h>
23 #include <asm/div64.h>
25 #include <asm/param.h>
26 #include <asm/cpu_has_feature.h>
28 typedef u64 __nocast cputime_t;
29 typedef u64 __nocast cputime64_t;
31 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
35 * Convert cputime <-> microseconds
37 extern u64 __cputime_usec_factor;
39 static inline unsigned long cputime_to_usecs(const cputime_t ct)
41 return mulhdu((__force u64) ct, __cputime_usec_factor);
45 * PPC64 uses PACA which is task independent for storing accounting data while
46 * PPC32 uses struct thread_info, therefore at task switch the accounting data
47 * has to be populated in the new task
50 #define get_accounting(tsk) (&get_paca()->accounting)
51 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
53 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
55 * Called from the context switch with interrupts disabled, to charge all
56 * accumulated times to the current process, and to prepare accounting on
59 static inline void arch_vtime_task_switch(struct task_struct *prev)
61 struct cpu_accounting_data *acct = get_accounting(current);
62 struct cpu_accounting_data *acct0 = get_accounting(prev);
64 acct->starttime = acct0->starttime;
65 acct->startspurr = acct0->startspurr;
69 #endif /* __KERNEL__ */
70 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
71 #endif /* __POWERPC_CPUTIME_H */