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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
7c3ab738 | 2 | /* |
940389b8 | 3 | * task_io_accounting: a structure which is used for recording a single task's |
7c3ab738 AM |
4 | * IO statistics. |
5 | * | |
6 | * Don't include this header file directly - it is designed to be dragged in via | |
7 | * sched.h. | |
8 | * | |
e1f8e874 | 9 | * Blame Andrew Morton for all this. |
7c3ab738 AM |
10 | */ |
11 | ||
940389b8 | 12 | struct task_io_accounting { |
5995477a | 13 | #ifdef CONFIG_TASK_XACCT |
5995477a AR |
14 | /* bytes read */ |
15 | u64 rchar; | |
16 | /* bytes written */ | |
17 | u64 wchar; | |
18 | /* # of read syscalls */ | |
19 | u64 syscr; | |
20 | /* # of write syscalls */ | |
21 | u64 syscw; | |
5995477a AR |
22 | #endif /* CONFIG_TASK_XACCT */ |
23 | ||
7c3ab738 | 24 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
7c3ab738 AM |
25 | /* |
26 | * The number of bytes which this task has caused to be read from | |
27 | * storage. | |
28 | */ | |
29 | u64 read_bytes; | |
30 | ||
31 | /* | |
32 | * The number of bytes which this task has caused, or shall cause to be | |
33 | * written to disk. | |
34 | */ | |
35 | u64 write_bytes; | |
36 | ||
37 | /* | |
38 | * A task can cause "negative" IO too. If this task truncates some | |
39 | * dirty pagecache, some IO which another task has been accounted for | |
40 | * (in its write_bytes) will not be happening. We _could_ just | |
41 | * subtract that from the truncating task's write_bytes, but there is | |
42 | * information loss in doing that. | |
43 | */ | |
44 | u64 cancelled_write_bytes; | |
5995477a | 45 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ |
5995477a | 46 | }; |