1 /* 2 * Definitions for measuring cputime on powerpc machines. 3 * 4 * Copyright (C) 2006 Paul Mackerras, IBM Corp. 5 * 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. 10 * 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. 14 */ 15 16 #ifndef __POWERPC_CPUTIME_H 17 #define __POWERPC_CPUTIME_H 18 19 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 20 21 #include <linux/types.h> 22 #include <linux/time.h> 23 #include <asm/div64.h> 24 #include <asm/time.h> 25 #include <asm/param.h> 26 27 typedef u64 __nocast cputime_t; 28 typedef u64 __nocast cputime64_t; 29 30 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) 31 32 #ifdef __KERNEL__ 33 /* 34 * Convert cputime <-> microseconds 35 */ 36 extern u64 __cputime_usec_factor; 37 38 static inline unsigned long cputime_to_usecs(const cputime_t ct) 39 { 40 return mulhdu((__force u64) ct, __cputime_usec_factor); 41 } 42 43 /* 44 * PPC64 uses PACA which is task independent for storing accounting data while 45 * PPC32 uses struct thread_info, therefore at task switch the accounting data 46 * has to be populated in the new task 47 */ 48 #ifdef CONFIG_PPC64 49 #define get_accounting(tsk) (&get_paca()->accounting) 50 static inline void arch_vtime_task_switch(struct task_struct *tsk) { } 51 #else 52 #define get_accounting(tsk) (&task_thread_info(tsk)->accounting) 53 /* 54 * Called from the context switch with interrupts disabled, to charge all 55 * accumulated times to the current process, and to prepare accounting on 56 * the next process. 57 */ 58 static inline void arch_vtime_task_switch(struct task_struct *prev) 59 { 60 struct cpu_accounting_data *acct = get_accounting(current); 61 struct cpu_accounting_data *acct0 = get_accounting(prev); 62 63 acct->starttime = acct0->starttime; 64 } 65 #endif 66 67 #endif /* __KERNEL__ */ 68 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */ 69 #endif /* __POWERPC_CPUTIME_H */ 70