46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/*
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* task_io_accounting: a structure which is used for recording a single task's
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* IO statistics.
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*
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* Don't include this header file directly - it is designed to be dragged in via
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* sched.h.
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*
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* Blame Andrew Morton for all this.
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*/
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struct task_io_accounting {
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#ifdef CONFIG_TASK_XACCT
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/* bytes read */
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u64 rchar;
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/* bytes written */
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u64 wchar;
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/* # of read syscalls */
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u64 syscr;
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/* # of write syscalls */
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u64 syscw;
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#endif /* CONFIG_TASK_XACCT */
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#ifdef CONFIG_TASK_IO_ACCOUNTING
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/*
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* The number of bytes which this task has caused to be read from
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* storage.
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*/
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u64 read_bytes;
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/*
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* The number of bytes which this task has caused, or shall cause to be
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* written to disk.
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*/
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u64 write_bytes;
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/*
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* A task can cause "negative" IO too. If this task truncates some
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* dirty pagecache, some IO which another task has been accounted for
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* (in its write_bytes) will not be happening. We _could_ just
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* subtract that from the truncating task's write_bytes, but there is
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* information loss in doing that.
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*/
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u64 cancelled_write_bytes;
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#endif /* CONFIG_TASK_IO_ACCOUNTING */
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};
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