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encapsulating all such access into wall-defined functions
that makes sure locking is done as needed.
It also cleans up some uses of wall time vs. uptime some
places, but there is sure to be more of these needed as
well, particularily in MD code. Also, many current calls
to microtime() should probably be changed to getmicrotime(),
or to the {,get}microuptime() versions.
ok art@ deraadt@ aaron@ matthieu@ beck@ sturm@ millert@ others
"Oh, that is not your problem!" from miod@
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looked at by various, testing henning@ mcbride@ dan weeks
mostly from netbsd via Pedro Martelletto <pbastos@rdc.puc-rio.br>
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accessed with BUFQ macros, bufq structs support extensible, potentially
changable algorithms and queue formats. the current default scheme
should support nice priority based queuing, but is missing some vfs_bio.c
support.
only on wd.c for now, other drivers are easy converts.
as a side bonus, this makes the driver code look cleaner.
idea for the name comes from netbsd, but this scheme is incompatible.
thanks to various people for testing.
ok grange@
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rescinded 22 July 1999. Proofed by myself and Theo.
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update settings.
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the disk structure.
The locking was mostly used in disk device drivers to prevent multiple
disklabel operations from going on simultaneously against the device.
Added disk_construct(), a constructor for the disk structure, that
initializes the lock structure in disk. It is called by default in
disk_attach() if it hasn't been called yet.
Added disk_lock and disk_unlock
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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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