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Commit | Line | Data |
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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 { |
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 | }; |