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C/C++ Source or Header  |  2008-12-24  |  2.5 KB  |  114 lines
  1. /*
  2.  * Task I/O accounting operations
  3.  */
  4. #ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
  5. #define __TASK_IO_ACCOUNTING_OPS_INCLUDED
  6.  
  7. #include <linux/sched.h>
  8.  
  9. #ifdef CONFIG_TASK_IO_ACCOUNTING
  10. static inline void task_io_account_read(size_t bytes)
  11. {
  12.     current->ioac.read_bytes += bytes;
  13. }
  14.  
  15. /*
  16.  * We approximate number of blocks, because we account bytes only.
  17.  * A 'block' is 512 bytes
  18.  */
  19. static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  20. {
  21.     return p->ioac.read_bytes >> 9;
  22. }
  23.  
  24. static inline void task_io_account_write(size_t bytes)
  25. {
  26.     current->ioac.write_bytes += bytes;
  27. }
  28.  
  29. /*
  30.  * We approximate number of blocks, because we account bytes only.
  31.  * A 'block' is 512 bytes
  32.  */
  33. static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  34. {
  35.     return p->ioac.write_bytes >> 9;
  36. }
  37.  
  38. static inline void task_io_account_cancelled_write(size_t bytes)
  39. {
  40.     current->ioac.cancelled_write_bytes += bytes;
  41. }
  42.  
  43. static inline void task_io_accounting_init(struct task_io_accounting *ioac)
  44. {
  45.     memset(ioac, 0, sizeof(*ioac));
  46. }
  47.  
  48. static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
  49.                         struct task_io_accounting *src)
  50. {
  51.     dst->read_bytes += src->read_bytes;
  52.     dst->write_bytes += src->write_bytes;
  53.     dst->cancelled_write_bytes += src->cancelled_write_bytes;
  54. }
  55.  
  56. #else
  57.  
  58. static inline void task_io_account_read(size_t bytes)
  59. {
  60. }
  61.  
  62. static inline unsigned long task_io_get_inblock(const struct task_struct *p)
  63. {
  64.     return 0;
  65. }
  66.  
  67. static inline void task_io_account_write(size_t bytes)
  68. {
  69. }
  70.  
  71. static inline unsigned long task_io_get_oublock(const struct task_struct *p)
  72. {
  73.     return 0;
  74. }
  75.  
  76. static inline void task_io_account_cancelled_write(size_t bytes)
  77. {
  78. }
  79.  
  80. static inline void task_io_accounting_init(struct task_io_accounting *ioac)
  81. {
  82. }
  83.  
  84. static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
  85.                         struct task_io_accounting *src)
  86. {
  87. }
  88.  
  89. #endif /* CONFIG_TASK_IO_ACCOUNTING */
  90.  
  91. #ifdef CONFIG_TASK_XACCT
  92. static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
  93.                         struct task_io_accounting *src)
  94. {
  95.     dst->rchar += src->rchar;
  96.     dst->wchar += src->wchar;
  97.     dst->syscr += src->syscr;
  98.     dst->syscw += src->syscw;
  99. }
  100. #else
  101. static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
  102.                         struct task_io_accounting *src)
  103. {
  104. }
  105. #endif /* CONFIG_TASK_XACCT */
  106.  
  107. static inline void task_io_accounting_add(struct task_io_accounting *dst,
  108.                         struct task_io_accounting *src)
  109. {
  110.     task_chr_io_accounting_add(dst, src);
  111.     task_blk_io_accounting_add(dst, src);
  112. }
  113. #endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
  114.