summaryrefslogtreecommitdiff
path: root/include/linux/blkdev.h
diff options
context:
space:
mode:
authorJens Axboe <jens.axboe@oracle.com>2008-01-24 08:52:45 +0100
committerJens Axboe <jens.axboe@oracle.com>2008-01-28 10:50:29 +0100
commitfd0928df98b9578be8a786ac0cb78a47a5e17a20 (patch)
tree70a34cf207bea1bec28e59cf0dba7d20e7f8b0f1 /include/linux/blkdev.h
parent91525300baf162e83e923b09ca286f9205e21522 (diff)
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/blkdev.h')
-rw-r--r--include/linux/blkdev.h81
1 files changed, 7 insertions, 74 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 49b7a4c31a6d..510a18ba1ec5 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -34,83 +34,10 @@ struct sg_io_hdr;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
-/*
- * 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 int 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;
-};
-
void put_io_context(struct io_context *ioc);
void exit_io_context(void);
struct io_context *get_io_context(gfp_t gfp_flags, int node);
+struct io_context *alloc_io_context(gfp_t gfp_flags, int node);
void copy_io_context(struct io_context **pdst, struct io_context **psrc);
void swap_io_context(struct io_context **ioc1, struct io_context **ioc2);
@@ -894,6 +821,12 @@ static inline void exit_io_context(void)
{
}
+static inline int put_io_context(struct io_context *ioc)
+{
+ return 1;
+}
+
+
#endif /* CONFIG_BLOCK */
#endif