root/arch/powerpc/include/asm/cputime.h

INCLUDED FROM

DEFINITIONS

1. cputime_to_usecs
2. arch_vtime_task_switch
3. arch_vtime_task_switch

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Definitions for measuring cputime on powerpc machines.
   4  *
   5  * Copyright (C) 2006 Paul Mackerras, IBM Corp.
   6  *
   7  * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
   8  * the same units as the timebase.  Otherwise we measure cpu time
   9  * in jiffies using the generic definitions.
  10  */
  11 
  12 #ifndef __POWERPC_CPUTIME_H
  13 #define __POWERPC_CPUTIME_H
  14 
  15 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
  16 
  17 #include <linux/types.h>
  18 #include <linux/time.h>
  19 #include <asm/div64.h>
  20 #include <asm/time.h>
  21 #include <asm/param.h>
  22 
  23 typedef u64 __nocast cputime_t;
  24 typedef u64 __nocast cputime64_t;
  25 
  26 #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
  27 
  28 #ifdef __KERNEL__
  29 /*
  30  * Convert cputime <-> microseconds
  31  */
  32 extern u64 __cputime_usec_factor;
  33 
  34 static inline unsigned long cputime_to_usecs(const cputime_t ct)
  35 {
  36         return mulhdu((__force u64) ct, __cputime_usec_factor);
  37 }
  38 
  39 /*
  40  * PPC64 uses PACA which is task independent for storing accounting data while
  41  * PPC32 uses struct thread_info, therefore at task switch the accounting data
  42  * has to be populated in the new task
  43  */
  44 #ifdef CONFIG_PPC64
  45 #define get_accounting(tsk)     (&get_paca()->accounting)
  46 static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
  47 #else
  48 #define get_accounting(tsk)     (&task_thread_info(tsk)->accounting)
  49 /*
  50  * Called from the context switch with interrupts disabled, to charge all
  51  * accumulated times to the current process, and to prepare accounting on
  52  * the next process.
  53  */
  54 static inline void arch_vtime_task_switch(struct task_struct *prev)
  55 {
  56         struct cpu_accounting_data *acct = get_accounting(current);
  57         struct cpu_accounting_data *acct0 = get_accounting(prev);
  58 
  59         acct->starttime = acct0->starttime;
  60 }
  61 #endif
  62 
  63 #endif /* __KERNEL__ */
  64 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
  65 #endif /* __POWERPC_CPUTIME_H */