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/* * 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 { void *key; unsigned long dead_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; struct hlist_node cic_list; void (*dtor)(struct io_context *); /* destructor */ void (*exit)(struct io_context *); /* called on task exit */ struct rcu_head rcu_head; }; /* "include/linux/iocontext.h" 120 lines --15%-- |
