CVS log for src/sys/kern/subr_iostat.c

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Account for trailing NUL bytes when calculating userland buffer size.

Sync with HEAD

Implement disk_rename()/iostat_rename() to rename a disk.

Use it from zvol_rename_minor() when renaming a ZVOL.

Sync with HEAD

Resolve a couple of conflicts (result of the uimin/uimax changes)

Rename min/max -> uimin/uimax for better honesty.

These functions are defined on unsigned int.  The generic name
min/max should not silently truncate to 32 bits on 64-bit systems.
This is purely a name change -- no functional change intended.

HOWEVER!  Some subsystems have

	#define min(a, b)	((a) < (b) ? (a) : (b))
	#define max(a, b)	((a) > (b) ? (a) : (b))

even though our standard name for that is MIN/MAX.  Although these
may invite multiple evaluation bugs, these do _not_ cause integer
truncation.

To avoid `fixing' these cases, I first changed the name in libkern,
and then compile-tested every file where min/max occurred in order to
confirm that it failed -- and thus confirm that nothing shadowed
min/max -- before changing it.

I have left a handful of bootloaders that are too annoying to
compile-test, and some dead code:

cobalt ews4800mips hp300 hppa ia64 luna68k vax
acorn32/if_ie.c (not included in any kernels)
macppc/if_gm.c (superseded by gem(4))

It should be easy to fix the fallout once identified -- this way of
doing things fails safe, and the goal here, after all, is to _avoid_
silent integer truncations, not introduce them.

Maybe one day we can reintroduce min/max as type-generic things that
never silently truncate.  But we should avoid doing that for a while,
so that existing code has a chance to be detected by the compiler for
conversion to uimin/uimax without changing the semantics until we can
properly audit it all.  (Who knows, maybe in some cases integer
truncation is actually intended!)

update from HEAD

Sync with HEAD

remove checks for failure after memory allocation calls that cannot fail:

  kmem_alloc() with KM_SLEEP
  kmem_zalloc() with KM_SLEEP
  percpu_alloc()
  pserialize_create()
  psref_class_create()

all of these paths include an assertion that the allocation has not failed,
so callers should not assert that again.

Sync with HEAD

Sync with HEAD

Enhance disk metrics by calculating a weighted sum that is incremented
by the number of concurrent I/O requests. Also introduce a new disk_wait()
function to measure requests waiting in a bufq.
iostat -y now reports data about waiting and active requests.

So far only drivers using dksubr and dk, ccd, wd and xbd collect data about
waiting requests.

src is too big these days to tolerate superfluous apostrophes.  It's
"its", people!

Rebase to HEAD as of a few days ago.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Ensure that the top level sysctl nodes (kern, vfs, net, ...) exist before
the sysctl link sets are processed, and remove redundancy.

Shaves >13kB off of an amd64 GENERIC, not to mention >1k duplicate
lines of code.

sync with head

Create CTL_HW before creating nodes on top of it (sysctl constructors
run in "random" order).

Replace a large number of link set based sysctl node creations with
calls from subsystem constructors.  Benefits both future kernel
modules and rump.

no change to sysctl nodes on i386/MONOLITHIC & build tested i386/ALL

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

sync with head.

Sync with HEAD.

Pull up following revision(s) (requested by ad in ticket #657):
	sys/kern/subr_disk.c: revision 1.95
	sys/kern/subr_iostat.c: revision 1.17
	sys/sys/disk.h: revision 1.52
	sys/sys/iostat.h: revision 1.10
Add disk_isbusy(), iostat_isbusy().

Add disk_isbusy(), iostat_isbusy().

Sync with HEAD.

malloc -> kmem_alloc

Sync w/ -current. 34 merge conflicts to follow.

sync with head

Sync with HEAD.

Remove pointless COMPAT ifdef.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

sync with head.

Merge newlock2 to head.

Replace lockmgr() locks.

Sync with head.

sync with head.

sync with head.

iostat: avoid sleeping with a held simple_lock.

sync with head

sync with head.

file subr_iostat.c was added on branch rpaulo-netinet-merge-pcb on 2006-09-09 02:57:16 +0000

Change iostat_alloc() to take the parent pointer and the name directly, so
that callers are not responsible for initializing the fields. Store the name
inside the struct instead of maintaining a pointer to external storage, or
leaked memory (nfs case).

sync with head.

sync with head.

Sync with head.

file subr_iostat.c was added on branch yamt-lazymbuf on 2006-06-21 15:09:38 +0000

merge FreeBSD timecounters from branch simonb-timecounters
- struct timeval time is gone
  time.tv_sec -> time_second
- struct timeval mono_time is gone
  mono_time.tv_sec -> time_uptime
- access to time via
	{get,}{micro,nano,bin}time()
	get* versions are fast but less precise
- support NTP nanokernel implementation (NTP API 4)
- further reading:
  Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf
  NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

sync with head.

sync with head

Sync with head.

file subr_iostat.c was added on branch peter-altq on 2006-05-24 15:50:41 +0000

file subr_iostat.c was added on branch yamt-pdpolicy on 2006-05-24 10:58:41 +0000

file subr_iostat.c was added on branch simonb-timecounters on 2006-04-22 11:39:59 +0000

iostat_alloc: don't forget to initialize io_busy etc.
fix weird "time" in iostat.

iostat_find/disk_find: constify and simplify.

sysctl_io_stats_setup: HW_IOSTATS is iostats, not drivestats.

remove some unnecessary #include.

iostat_alloc: use waitok allocation.

unwrap a short line.

whitespace.

Prefix iostat structure elements with io_

sync with head.

file subr_iostat.c was added on branch elad-kernelauth on 2006-04-19 05:14:00 +0000

Functions to support io statistics collection.