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ever used. Now a single state is kept for net, tty and disk events resp.
Also, call the randomness from disk_unbusy instead of biodone, as biodone
gets a lot of virtual events (from virtual filesystems etc), and as a bonus:
feed xfer time and size into the entropy pool too.
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New generic disk framework. Highlights:
New metrics handling. Metrics are now kept in the new `struct disk'.
Busy time is now stored as a timeval, and transfer count in bytes.
Storage for disklabels is now dynamically allocated, so that the size
of the disk structure is not machine-dependent.
Several new functions for attaching and detaching disks, and handling
metrics calculation.
Old-style instrumentation is still supported in drivers that did it
before. However, old-style instrumentation is being deprecated, and
will go away once the userland utilities are updated for the new
framework.
For usage and architectural details, see the forthcoming disk(9)
manual page.
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Move the old-style disk instrumentation "structures" to a central
location (sys/kern/subr_disk.c) and note that they should/will be
deprecated.
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