arch/powerpc/include/asm/cputime.h

   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 */