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7c3ab738 AM |
1 | /* |
2 | * task_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_IO_ACCOUNTING | |
12 | struct task_io_accounting { | |
13 | /* | |
14 | * The number of bytes which this task has caused to be read from | |
15 | * storage. | |
16 | */ | |
17 | u64 read_bytes; | |
18 | ||
19 | /* | |
20 | * The number of bytes which this task has caused, or shall cause to be | |
21 | * written to disk. | |
22 | */ | |
23 | u64 write_bytes; | |
24 | ||
25 | /* | |
26 | * A task can cause "negative" IO too. If this task truncates some | |
27 | * dirty pagecache, some IO which another task has been accounted for | |
28 | * (in its write_bytes) will not be happening. We _could_ just | |
29 | * subtract that from the truncating task's write_bytes, but there is | |
30 | * information loss in doing that. | |
31 | */ | |
32 | u64 cancelled_write_bytes; | |
33 | }; | |
34 | #else | |
35 | struct task_io_accounting { | |
36 | }; | |
37 | #endif |