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author | Jens Axboe <jens.axboe@oracle.com> | 2008-01-24 08:52:45 +0100 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2008-01-28 10:50:29 +0100 |
commit | fd0928df98b9578be8a786ac0cb78a47a5e17a20 (patch) | |
tree | 70a34cf207bea1bec28e59cf0dba7d20e7f8b0f1 /include/linux/iocontext.h | |
parent | 91525300baf162e83e923b09ca286f9205e21522 (diff) | |
download | op-kernel-dev-fd0928df98b9578be8a786ac0cb78a47a5e17a20.zip op-kernel-dev-fd0928df98b9578be8a786ac0cb78a47a5e17a20.tar.gz |
ioprio: move io priority from task_struct to io_context
This is where it belongs and then it doesn't take up space for a
process that doesn't do IO.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include/linux/iocontext.h')
-rw-r--r-- | include/linux/iocontext.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h new file mode 100644 index 0000000..186807e --- /dev/null +++ b/include/linux/iocontext.h @@ -0,0 +1,79 @@ +#ifndef IOCONTEXT_H +#define IOCONTEXT_H + +/* + * This is the per-process anticipatory I/O scheduler state. + */ +struct as_io_context { + spinlock_t lock; + + void (*dtor)(struct as_io_context *aic); /* destructor */ + void (*exit)(struct as_io_context *aic); /* called on task exit */ + + unsigned long state; + atomic_t nr_queued; /* queued reads & sync writes */ + atomic_t nr_dispatched; /* number of requests gone to the drivers */ + + /* IO History tracking */ + /* Thinktime */ + unsigned long last_end_request; + unsigned long ttime_total; + unsigned long ttime_samples; + unsigned long ttime_mean; + /* Layout pattern */ + unsigned int seek_samples; + sector_t last_request_pos; + u64 seek_total; + sector_t seek_mean; +}; + +struct cfq_queue; +struct cfq_io_context { + struct rb_node rb_node; + void *key; + + struct cfq_queue *cfqq[2]; + + struct io_context *ioc; + + unsigned long last_end_request; + sector_t last_request_pos; + + unsigned long ttime_total; + unsigned long ttime_samples; + unsigned long ttime_mean; + + unsigned int seek_samples; + u64 seek_total; + sector_t seek_mean; + + struct list_head queue_list; + + void (*dtor)(struct io_context *); /* destructor */ + void (*exit)(struct io_context *); /* called on task exit */ +}; + +/* + * This is the per-process I/O subsystem state. It is refcounted and + * kmalloc'ed. Currently all fields are modified in process io context + * (apart from the atomic refcount), so require no locking. + */ +struct io_context { + atomic_t refcount; + struct task_struct *task; + + unsigned short ioprio; + unsigned short ioprio_changed; + + /* + * For request batching + */ + unsigned long last_waited; /* Time last woken after wait for request */ + int nr_batch_requests; /* Number of requests left in the batch */ + + struct as_io_context *aic; + struct rb_root cic_root; + void *ioc_data; +}; + +#endif |