Commit | Line | Data |
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7c3ab738 | 1 | /* |
940389b8 | 2 | * task_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 | * | |
e1f8e874 | 8 | * Blame Andrew Morton for all this. |
7c3ab738 AM |
9 | */ |
10 | ||
940389b8 | 11 | struct task_io_accounting { |
5995477a | 12 | #ifdef CONFIG_TASK_XACCT |
5995477a AR |
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; | |
5995477a AR |
21 | #endif /* CONFIG_TASK_XACCT */ |
22 | ||
7c3ab738 | 23 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
7c3ab738 AM |
24 | /* |
25 | * The number of bytes which this task has caused to be read from | |
26 | * storage. | |
27 | */ | |
28 | u64 read_bytes; | |
29 | ||
30 | /* | |
31 | * The number of bytes which this task has caused, or shall cause to be | |
32 | * written to disk. | |
33 | */ | |
34 | u64 write_bytes; | |
35 | ||
36 | /* | |
37 | * A task can cause "negative" IO too. If this task truncates some | |
38 | * dirty pagecache, some IO which another task has been accounted for | |
39 | * (in its write_bytes) will not be happening. We _could_ just | |
40 | * subtract that from the truncating task's write_bytes, but there is | |
41 | * information loss in doing that. | |
42 | */ | |
43 | u64 cancelled_write_bytes; | |
5995477a | 44 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
5995477a | 45 | }; |