[mirror_ubuntu-bionic-kernel.git] / include / linux / task_io_accounting.h

/*
 * proc_io_accounting: a structure which is used for recording a single task's
 * IO statistics.
 *
 * Don't include this header file directly - it is designed to be dragged in via
 * sched.h.
 *
 * Blame akpm@osdl.org for all this.
 */

#ifdef CONFIG_TASK_XACCT
struct task_chr_io_accounting {
	/* bytes read */
	u64 rchar;
	/*  bytes written */
	u64 wchar;
	/* # of read syscalls */
	u64 syscr;
	/* # of write syscalls */
	u64 syscw;
};
#else /* CONFIG_TASK_XACCT */
struct task_chr_io_accounting {
};
#endif /* CONFIG_TASK_XACCT */

#ifdef CONFIG_TASK_IO_ACCOUNTING
struct task_io_accounting {
	/*
	 * The number of bytes which this task has caused to be read from
	 * storage.
	 */
	u64 read_bytes;

	/*
	 * The number of bytes which this task has caused, or shall cause to be
	 * written to disk.
	 */
	u64 write_bytes;

	/*
	 * A task can cause "negative" IO too.  If this task truncates some
	 * dirty pagecache, some IO which another task has been accounted for
	 * (in its write_bytes) will not be happening.  We _could_ just
	 * subtract that from the truncating task's write_bytes, but there is
	 * information loss in doing that.
	 */
	u64 cancelled_write_bytes;
};
#else /* CONFIG_TASK_IO_ACCOUNTING */
struct task_io_accounting {
};
#endif /* CONFIG_TASK_IO_ACCOUNTING */

struct proc_io_accounting {
	struct task_chr_io_accounting chr;
	struct task_io_accounting blk;
};
Commit	Line	Data
7c3ab738	1	/*
5995477a	2	* proc_io_accounting: a structure which is used for recording a single task's
7c3ab738 AM	3	* IO statistics.
	4	*
	5	* Don't include this header file directly - it is designed to be dragged in via
	6	* sched.h.
	7	*
	8	* Blame akpm@osdl.org for all this.
	9	*/
	10
5995477a AR	11	#ifdef CONFIG_TASK_XACCT
	12	struct task_chr_io_accounting {
	13	/* bytes read */
	14	u64 rchar;
	15	/* bytes written */
	16	u64 wchar;
	17	/* # of read syscalls */
	18	u64 syscr;
	19	/* # of write syscalls */
	20	u64 syscw;
	21	};
	22	#else /* CONFIG_TASK_XACCT */
	23	struct task_chr_io_accounting {
	24	};
	25	#endif /* CONFIG_TASK_XACCT */
	26
7c3ab738 AM	27	#ifdef CONFIG_TASK_IO_ACCOUNTING
	28	struct task_io_accounting {
	29	/*
	30	* The number of bytes which this task has caused to be read from
	31	* storage.
	32	*/
	33	u64 read_bytes;
	34
	35	/*
	36	* The number of bytes which this task has caused, or shall cause to be
	37	* written to disk.
	38	*/
	39	u64 write_bytes;
	40
	41	/*
	42	* A task can cause "negative" IO too. If this task truncates some
	43	* dirty pagecache, some IO which another task has been accounted for
	44	* (in its write_bytes) will not be happening. We _could_ just
	45	* subtract that from the truncating task's write_bytes, but there is
	46	* information loss in doing that.
	47	*/
	48	u64 cancelled_write_bytes;
	49	};
5995477a	50	#else /* CONFIG_TASK_IO_ACCOUNTING */
7c3ab738 AM	51	struct task_io_accounting {
7c3ab738 AM	52	};
5995477a AR	53	#endif /* CONFIG_TASK_IO_ACCOUNTING */
	54
	55	struct proc_io_accounting {
	56	struct task_chr_io_accounting chr;
	57	struct task_io_accounting blk;
	58	};