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Linux kernel mirror (for testing)
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linux
1/*
2 * proc_io_accounting: a structure which is used for recording a single task's
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
11#ifdef CONFIG_TASK_XACCT
12struct 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 */
23struct task_chr_io_accounting {
24};
25#endif /* CONFIG_TASK_XACCT */
26
27#ifdef CONFIG_TASK_IO_ACCOUNTING
28struct 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};
50#else /* CONFIG_TASK_IO_ACCOUNTING */
51struct task_io_accounting {
52};
53#endif /* CONFIG_TASK_IO_ACCOUNTING */
54
55struct proc_io_accounting {
56 struct task_chr_io_accounting chr;
57 struct task_io_accounting blk;
58};