Poul-Henning Kamp 7a6b2b6429 Fix a long-standing deadlock issue with vnode backed md(4) devices: ... On vnode backed md(4) devices over a certain, currently undetermined size relative to the buffer cache our "lemming-syncer" can provoke a buffer starvation which puts the md thread to sleep on wdrain. This generally tends to grind the entire system to a stop because the event that is supposed to wake up the thread will not happen until a fair bit of the piled up I/O requests in the system finish, and since a lot of those are on a md(4) vnode backed device which is currently waiting on wdrain until a fair amount of the piled up ... you get the picture. The cure is to issue all VOP_WRITES on the vnode backing the device with IO_SYNC. In addition to more closely emulating a real disk device with a non-lying write-cache, this makes the writes exempt from rate-limited (there to avoid starving the buffer cache) and consequently prevents the deadlock. Unfortunately performance takes a hit. Add "async" option to give people who know what they are doing the old behaviour.		2004-03-10 20:41:09 +00:00
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alpha	Retire pmap_pinit2(). Alpha was the last platform that used it. However,	2004-03-07 21:06:48 +00:00
amd64	Stop depending on #include pollution from cpufunc.h	2004-03-08 00:25:03 +00:00
arm	Add sysentvec->sv_fixlimits() hook so that we can catch cases on 64 bit	2003-09-25 01:10:26 +00:00
boot	Reset the text attributes when initializing the console. The EFI	2004-03-09 04:00:33 +00:00
cam	Compare the *number* of patterns to zero, not the *pointer* to the	2004-02-28 12:59:56 +00:00
coda	Device megapatch 5/6:	2004-02-21 21:32:15 +00:00
compat	Fix several issues related to the KeInitializeTimer() etc... API stuff	2004-03-10 07:43:11 +00:00
conf	Link pf to the build and install:	2004-03-08 22:03:29 +00:00
contrib	Remove `$Name$' leftovers from the port version reporting.	2004-03-10 15:08:21 +00:00
crypto	Fix a reentrancy issue in md5_calc().	2004-01-27 18:57:21 +00:00
ddb	Give DDB a "watchdog" command which disables all watchdogs.	2004-02-29 09:55:32 +00:00
dev	Fix a long-standing deadlock issue with vnode backed md(4) devices:	2004-03-10 20:41:09 +00:00
fs	Change __FUNCTION__ to __func__	2004-03-03 07:43:34 +00:00
geom	Rearrange some of the GEOM debugging tools to be more structured.	2004-03-10 08:49:08 +00:00
gnu	Enforce the file size limit in VOP_WRITE() as well as VOP_TRUNCATE();	2004-02-19 09:06:06 +00:00
i4b	Device megapatch 4/6:	2004-02-21 21:10:55 +00:00
i386	- Make the acquisition of Giant in vm_fault_unwire() conditional on the	2004-03-10 04:44:43 +00:00
ia64	Retire pmap_pinit2(). Alpha was the last platform that used it. However,	2004-03-07 21:06:48 +00:00
isa	Remove unused FDNUMTOUNIT() macro	2004-02-29 10:21:40 +00:00
isofs/cd9660	Fix comment containing vop_readdir_args contents: a_cookies is really	2004-02-23 01:43:00 +00:00
kern	make sure we had the filedesc lock when calling fdinit when RFCFDG is set	2004-03-10 00:27:36 +00:00
libkern	Remove register keyword and constify tmp values. This fixes	2004-02-12 03:23:13 +00:00
modules	Link pf to the build and install:	2004-03-08 22:03:29 +00:00
net	Fix handling of tap/vmnet flag in relation to cloning and properly enforce	2004-03-10 08:02:29 +00:00
net80211	Change WI_RID_SCAN_RES compatibility interface to return the result after	2004-01-19 05:25:43 +00:00
netatalk	Rename dup_sockaddr() to sodupsockaddr() for consistency with other	2004-03-01 03:14:23 +00:00
netatm	Don't remove the first mbuf in the chain if it got empty.	2004-02-21 12:55:07 +00:00
netgraph	Add a netgraph node to handle ATM LLC encapsulation. This currently handles	2004-03-08 10:54:35 +00:00
netinet	Lock down IP-layer encapsulation library:	2004-03-10 02:48:50 +00:00
netinet6	Move the AH algorithm list from a static local function variable to	2004-03-10 04:56:54 +00:00
netipsec	Fix type in a sysctl. It used to be: net.key.prefered_oldsa	2004-02-16 17:09:53 +00:00
netipx	Rename dup_sockaddr() to sodupsockaddr() for consistency with other	2004-03-01 03:14:23 +00:00
netkey	avoid duplicate free.	2004-01-25 17:18:12 +00:00
netnatm	Rename dup_sockaddr() to sodupsockaddr() for consistency with other	2004-03-01 03:14:23 +00:00
netncp	Split the mlock() kernel code into two parts, mlock(), which unpacks	2004-02-26 00:27:04 +00:00
netsmb	Rename dup_sockaddr() to sodupsockaddr() for consistency with other	2004-03-01 03:14:23 +00:00
nfs	University of Michigan's Citi NFSv4 kernel client code.	2003-11-14 20:54:10 +00:00
nfs4client	kthread_exit() no longer requires Giant, so don't force callers to acquire	2004-03-05 22:42:17 +00:00
nfsclient	Rename dup_sockaddr() to sodupsockaddr() for consistency with other	2004-03-01 03:14:23 +00:00
nfsserver	Convert from timeout to callout API.	2004-03-07 16:28:31 +00:00
opencrypto	kthread_exit() no longer requires Giant, so don't force callers to acquire	2004-03-05 22:42:17 +00:00
pc98	Restore CDIOCREADAUDIO ioctl.	2004-03-07 14:16:42 +00:00
pccard	Device megapatch 4/6:	2004-02-21 21:10:55 +00:00
pci	Device megapatch 4/6:	2004-02-21 21:10:55 +00:00
posix4	The sem_timedwait() and ksem_timedwait() functions both	2004-02-03 22:27:03 +00:00
powerpc	Retire pmap_pinit2(). Alpha was the last platform that used it. However,	2004-03-07 21:06:48 +00:00
rpc	Convert from timeout to callout API.	2004-03-07 16:23:03 +00:00
security	Define BPFD_LOCK_ASSERT() to assert the BPF descriptor lock.	2004-02-29 15:33:56 +00:00
sparc64	Change time_t from a 32-bit value to a 64-bit value, on FreeBSD/sparc64	2004-03-10 17:39:05 +00:00
sys	Fix a long-standing deadlock issue with vnode backed md(4) devices:	2004-03-10 20:41:09 +00:00
tools	Attempt to clean up the emu10k1-alsa.h stuff so that config doesn't	2004-02-05 22:51:16 +00:00
ufs	A more accurate test in the new ufs_lock than that in 1.235.	2004-02-23 19:05:05 +00:00
vm	- Make the acquisition of Giant in vm_fault_unwire() conditional on the	2004-03-10 04:44:43 +00:00
Makefile	Replaced outdated comment.	2004-01-17 03:28:27 +00:00