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