Konstantin Belousov 8917728875 vn_io_fault() handling of the LOR for i/o into the file-backed buffers ... has observable overhead when the buffer pages are not resident or not mapped. The overhead comes at least from two factors, one is the additional work needed to detect the situation, prepare and execute the rollbacks. Another is the consequence of the i/o splitting into the batches of the held pages, causing filesystems see series of the smaller i/o requests instead of the single large request. Note that expected case of the resident i/o buffer does not expose these issues. Provide a prefaulting for the userspace i/o buffers, disabled by default. I am careful of not enabling prefaulting by default for now, since it would be detrimental for the applications which speculatively pass extra-large buffers of anonymous memory to not deal with buffer sizing (if such apps exist). Found and tested by: bde, emaste Sponsored by: The FreeBSD Foundation MFC after: 1 week		2015-07-31 04:12:51 +00:00
..
amd64	Improve comments.	2015-07-30 15:47:53 +00:00
arm	Remove obsolete vendor code from Alpine platform support	2015-07-30 13:45:34 +00:00
arm64	Add enough of pmap_page_set_memattr to run gstat. It still needs to split	2015-07-30 16:17:44 +00:00
boot	Use consistent spacing.	2015-07-25 20:17:19 +00:00
bsm
cam	Refactor unmapped buffer address handling.	2015-07-23 19:13:41 +00:00
cddl	Add warning about low KSTACK_PAGES for ZFS use	2015-07-28 11:19:38 +00:00
compat	Make pipes in CloudABI work.	2015-07-29 17:18:27 +00:00
conf	Add GPIO backlight driver compatible with Linux FDT bindings.	2015-07-30 19:04:14 +00:00
contrib	Import Annapurna Labs Alpine HAL to sys/contrib/	2015-07-28 14:20:33 +00:00
crypto	const'ify an arg that we don't update...	2015-07-29 23:37:15 +00:00
ddb	Various changes to the registers displayed in DDB for x86.	2015-07-22 01:09:02 +00:00
dev	Add GPIO backlight driver compatible with Linux FDT bindings.	2015-07-30 19:04:14 +00:00
fs	This patch fixes a problem where, if the NFSv4 server has a previous	2015-07-29 23:06:30 +00:00
gdb	CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten	2015-05-22 17:05:21 +00:00
geom	Report the scheme and provider names in warning message about unaligned	2015-07-26 11:16:48 +00:00
gnu	The GNU Amlogic DTS files have some errors (e.g. bad register	2015-04-11 08:17:39 +00:00
i386	Improve comments.	2015-07-30 15:47:53 +00:00
isa
kern	vn_io_fault() handling of the LOR for i/o into the file-backed buffers	2015-07-31 04:12:51 +00:00
kgssapi
libkern	Remove checks for __ARM_EABI__, we only build for EABI now.	2015-07-09 21:02:40 +00:00
mips	Remove dead functions pmap_pvdump and pads.	2015-07-29 20:47:27 +00:00
modules	Build if_stf(4) module only when both INET and INET6 support are enabled.	2015-07-30 10:26:43 +00:00
net	Clean up this header file...	2015-07-31 00:23:21 +00:00
net80211	Break out the current 802.11 software scan methods into an indirect table.	2015-06-08 02:35:43 +00:00
netgraph	* Address review (and add a bit myself).	2015-07-12 18:14:38 +00:00
netinet	Update snd_una description to make it more readable.	2015-07-30 19:24:49 +00:00
netinet6	Eliminate the use of m_copydata() in gif_encapcheck().	2015-07-29 14:07:43 +00:00
netipsec	these are comparing authenticators and need to be constant time...	2015-07-31 00:31:52 +00:00
netnatm
netpfil	Reduce overhead of ipfw's me6 opcode.	2015-07-29 10:53:42 +00:00
netsmb
nfs
nfsclient	Remove some oldnfs remnants.	2015-04-18 16:08:06 +00:00
nfsserver
nlm
ofed	ib mad: fix an incorrect use of list_for_each_entry	2015-07-30 18:28:37 +00:00
opencrypto	Fix XTS, and name things a bit better...	2015-07-14 07:45:18 +00:00
pc98	Spell crypto correctly.	2015-07-14 10:47:56 +00:00
powerpc	Implement the lockstat provider using SDT(9) instead of the custom provider	2015-07-19 22:14:09 +00:00
rpc	Remove useless acquire semantic from the atomic_add operation before	2015-07-28 06:58:10 +00:00
security	fd: make 'rights' a manadatory argument to fget* functions	2015-07-05 19:05:16 +00:00
sparc64	o Revert the other functional half of r239864, i. e. the merge of r134227	2015-07-24 15:13:21 +00:00
sys	Revert r285125 until rmlocks get fixed.	2015-07-30 19:52:43 +00:00
teken
tools
ufs	- Make 'struct buf *buf' private to vfs_bio.c. Having a global variable	2015-07-29 02:26:57 +00:00
vm	Do not pretend that vm_fault(9) supports unwiring the address. Rename	2015-07-30 18:28:34 +00:00
x86	Add bit names for the IA32_MISC_ENABLE msr.	2015-07-28 06:55:08 +00:00
xdr
xen	Add support for Xen blkif indirect segment I/Os. This makes it possible for	2015-07-30 03:50:01 +00:00
Makefile	Kill EoL whitespace.	2015-05-29 14:03:07 +00:00