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940389b8af
Simplify the code of include/linux/task_io_accounting.h. It is also more reasonable to have all the task i/o-related statistics in a single struct (task_io_accounting). Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
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* Task I/O accounting operations
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*/
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#ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
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#define __TASK_IO_ACCOUNTING_OPS_INCLUDED
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#include <linux/sched.h>
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#ifdef CONFIG_TASK_IO_ACCOUNTING
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static inline void task_io_account_read(size_t bytes)
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{
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current->ioac.read_bytes += bytes;
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}
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/*
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* We approximate number of blocks, because we account bytes only.
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* A 'block' is 512 bytes
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*/
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static inline unsigned long task_io_get_inblock(const struct task_struct *p)
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{
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return p->ioac.read_bytes >> 9;
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}
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static inline void task_io_account_write(size_t bytes)
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{
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current->ioac.write_bytes += bytes;
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}
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/*
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* We approximate number of blocks, because we account bytes only.
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* A 'block' is 512 bytes
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*/
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static inline unsigned long task_io_get_oublock(const struct task_struct *p)
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{
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return p->ioac.write_bytes >> 9;
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}
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static inline void task_io_account_cancelled_write(size_t bytes)
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{
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current->ioac.cancelled_write_bytes += bytes;
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}
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static inline void task_io_accounting_init(struct task_io_accounting *ioac)
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{
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memset(ioac, 0, sizeof(*ioac));
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}
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static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
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struct task_io_accounting *src)
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{
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dst->read_bytes += src->read_bytes;
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dst->write_bytes += src->write_bytes;
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dst->cancelled_write_bytes += src->cancelled_write_bytes;
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}
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#else
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static inline void task_io_account_read(size_t bytes)
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{
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}
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static inline unsigned long task_io_get_inblock(const struct task_struct *p)
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{
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return 0;
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}
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static inline void task_io_account_write(size_t bytes)
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{
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}
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static inline unsigned long task_io_get_oublock(const struct task_struct *p)
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{
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return 0;
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}
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static inline void task_io_account_cancelled_write(size_t bytes)
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{
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}
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static inline void task_io_accounting_init(struct task_io_accounting *ioac)
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{
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}
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static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
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struct task_io_accounting *src)
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{
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}
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#endif /* CONFIG_TASK_IO_ACCOUNTING */
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#ifdef CONFIG_TASK_XACCT
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static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
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struct task_io_accounting *src)
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{
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dst->rchar += src->rchar;
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dst->wchar += src->wchar;
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dst->syscr += src->syscr;
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dst->syscw += src->syscw;
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}
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#else
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static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
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struct task_io_accounting *src)
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{
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}
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#endif /* CONFIG_TASK_XACCT */
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static inline void task_io_accounting_add(struct task_io_accounting *dst,
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struct task_io_accounting *src)
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{
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task_chr_io_accounting_add(dst, src);
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task_blk_io_accounting_add(dst, src);
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}
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#endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */
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