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Ed Maste 01715d8cd1 speed up ar(1) on UFS file systems 
Fault in the buffer prior to writing to workaround poor performance due
to interaction with kernel fs deadlock avoidance code. See the comment
prior to vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the
issue.

On my stable/10 desktop with a 16MB obj.o and "ar r out.a obj.o" I see
the following run times (seconds):

x ar.r284891
+ ar.patched
+----------------------------------------------------------------------+
|+                                                                     |
|+                                                                    x|
|+                                                                   xx|
|A                                                                   |A|
+----------------------------------------------------------------------+
    N         Min          Max        Median           Avg        Stddev
x   3       1.307        1.321         1.315     1.3143333  0.0070237692
+   3       0.020        0.023         0.022   0.021666667  0.0015275252
Difference at 95.0% confidence
        -1.29267 +/- 0.0115203
        -98.3515% +/- 0.876513%
        (Student's t, pooled s = 0.00508265)

Thanks to kib for diagnosing and explaining the issue and suggesting
the workaround.

Reviewed by:	eadler, kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D2933
2015-06-29 13:48:44 +00:00
..
addr2line
new depends
2015-06-16 23:37:19 +00:00
alias
Add META_MODE support.
2015-06-13 19:20:56 +00:00
apply
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ar
speed up ar(1) on UFS file systems
2015-06-29 13:48:44 +00:00
asa
Add META_MODE support.
2015-06-13 19:20:56 +00:00
at
Add META_MODE support.
2015-06-13 19:20:56 +00:00
atm
Add META_MODE support.
2015-06-13 19:20:56 +00:00
awk
Add META_MODE support.
2015-06-13 19:20:56 +00:00
banner
Add META_MODE support.
2015-06-13 19:20:56 +00:00
basename
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bc
Add META_MODE support.
2015-06-13 19:20:56 +00:00
biff
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bluetooth
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bmake
new depends
2015-06-16 23:37:19 +00:00
brandelf
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bsdiff
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bzip2
Add META_MODE support.
2015-06-13 19:20:56 +00:00
bzip2recover
Add META_MODE support.
2015-06-13 19:20:56 +00:00
c89
Add META_MODE support.
2015-06-13 19:20:56 +00:00
c99
Add META_MODE support.
2015-06-13 19:20:56 +00:00
calendar
- Add acm@ entry
2015-06-17 02:43:20 +00:00
cap_mkdb
Add META_MODE support.
2015-06-13 19:20:56 +00:00
catman
Add META_MODE support.
2015-06-13 19:20:56 +00:00
chat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
checknr
Add META_MODE support.
2015-06-13 19:20:56 +00:00
chkey
Add META_MODE support.
2015-06-13 19:20:56 +00:00
chpass
Add META_MODE support.
2015-06-13 19:20:56 +00:00
cksum
Add META_MODE support.
2015-06-13 19:20:56 +00:00
clang
new depends
2015-06-16 23:37:19 +00:00
cmp
Add META_MODE support.
2015-06-13 19:20:56 +00:00
col
Add META_MODE support.
2015-06-13 19:20:56 +00:00
colcrt
Add META_MODE support.
2015-06-13 19:20:56 +00:00
colldef
new depends
2015-06-16 23:37:19 +00:00
colrm
Add META_MODE support.
2015-06-13 19:20:56 +00:00
column
Add META_MODE support.
2015-06-13 19:20:56 +00:00
comm
Add META_MODE support.
2015-06-13 19:20:56 +00:00
compile_et
Add META_MODE support.
2015-06-13 19:20:56 +00:00
compress
Add META_MODE support.
2015-06-13 19:20:56 +00:00
cpio
Add META_MODE support.
2015-06-13 19:20:56 +00:00
cpuset
Add META_MODE support.
2015-06-13 19:20:56 +00:00
csplit
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ctags
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ctlstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
cut
Add META_MODE support.
2015-06-13 19:20:56 +00:00
cxxfilt
Actually add c++filt's Makefile
2015-04-30 22:51:15 +00:00
dc
Add META_MODE support.
2015-06-13 19:20:56 +00:00
dirname
Add META_MODE support.
2015-06-13 19:20:56 +00:00
dpv
mdoc: sort SEE ALSO.
2014-12-26 21:56:23 +00:00
drill
Convert to usr.bin/ to LIBADD
2014-11-25 14:29:10 +00:00
dtc
dtc: ignore lines starting with #.
2014-06-10 06:16:34 +00:00
du
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ee
new depends
2015-06-16 23:37:19 +00:00
elf2aout
Add META_MODE support.
2015-06-13 19:20:56 +00:00
elfcopy
new depends
2015-06-16 23:37:19 +00:00
elfdump
Add META_MODE support.
2015-06-13 19:20:56 +00:00
enigma
Add META_MODE support.
2015-06-13 19:20:56 +00:00
env
Add META_MODE support.
2015-06-13 19:20:56 +00:00
expand
Add META_MODE support.
2015-06-13 19:20:56 +00:00
false
Add META_MODE support.
2015-06-13 19:20:56 +00:00
fetch
Add META_MODE support.
2015-06-13 19:20:56 +00:00
file
Add META_MODE support.
2015-06-13 19:20:56 +00:00
file2c
Add META_MODE support.
2015-06-13 19:20:56 +00:00
find
new depends
2015-06-16 23:37:19 +00:00
finger
Add META_MODE support.
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fmt
Add META_MODE support.
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fold
Add META_MODE support.
2015-06-13 19:20:56 +00:00
from
Add META_MODE support.
2015-06-13 19:20:56 +00:00
fstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
fsync
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ftp
Add META_MODE support.
2015-06-13 19:20:56 +00:00
gcore
Add META_MODE support.
2015-06-13 19:20:56 +00:00
gencat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
getconf
new depends
2015-06-16 23:37:19 +00:00
getent
Add META_MODE support.
2015-06-13 19:20:56 +00:00
getopt
Add META_MODE support.
2015-06-13 19:20:56 +00:00
gprof
Add META_MODE support.
2015-06-13 19:20:56 +00:00
grep
new depends
2015-06-16 23:37:19 +00:00
gzip
Add META_MODE support.
2015-06-13 19:20:56 +00:00
head
Add META_MODE support.
2015-06-13 19:20:56 +00:00
hesinfo
…
hexdump
Add META_MODE support.
2015-06-13 19:20:56 +00:00
host
Add META_MODE support.
2015-06-13 19:20:56 +00:00
iconv
Remove the const qualifier from iconv(3) to comply with POSIX:
2015-04-15 09:09:20 +00:00
id
Add META_MODE support.
2015-06-13 19:20:56 +00:00
indent
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ipcrm
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ipcs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
iscsictl
Add libxo(3) support to iscsictl(8).
2015-04-12 09:36:50 +00:00
join
Add META_MODE support.
2015-06-13 19:20:56 +00:00
jot
Add META_MODE support.
2015-06-13 19:20:56 +00:00
kdump
new depends
2015-06-16 23:37:19 +00:00
keylogin
Add META_MODE support.
2015-06-13 19:20:56 +00:00
keylogout
Add META_MODE support.
2015-06-13 19:20:56 +00:00
killall
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ktrace
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ktrdump
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lam
Add META_MODE support.
2015-06-13 19:20:56 +00:00
last
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lastcomm
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ldd
Add META_MODE support.
2015-06-13 19:20:56 +00:00
leave
Add META_MODE support.
2015-06-13 19:20:56 +00:00
less
new depends
2015-06-16 23:37:19 +00:00
lessecho
new depends
2015-06-16 23:37:19 +00:00
lesskey
new depends
2015-06-16 23:37:19 +00:00
lex
Add META_MODE support.
2015-06-13 19:20:56 +00:00
limits
Add META_MODE support.
2015-06-13 19:20:56 +00:00
locale
Add META_MODE support.
2015-06-13 19:20:56 +00:00
locate
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lock
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lockf
Add META_MODE support.
2015-06-13 19:20:56 +00:00
logger
Add META_MODE support.
2015-06-13 19:20:56 +00:00
login
Add META_MODE support.
2015-06-13 19:20:56 +00:00
logins
Add META_MODE support.
2015-06-13 19:20:56 +00:00
logname
Add META_MODE support.
2015-06-13 19:20:56 +00:00
look
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lorder
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lsvfs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
lzmainfo
Add META_MODE support.
2015-06-13 19:20:56 +00:00
m4
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mail
Add META_MODE support.
2015-06-13 19:20:56 +00:00
makewhatis
Add META_MODE support.
2015-06-13 19:20:56 +00:00
man
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mandoc
new depends
2015-06-16 23:37:19 +00:00
mesg
Add META_MODE support.
2015-06-13 19:20:56 +00:00
minigzip
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ministat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mkcsmapper
mdoc: sort SEE ALSO.
2014-12-26 21:56:23 +00:00
mkcsmapper_static
NO_WARNS when building for host
2015-06-14 03:34:09 +00:00
mkdep
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mkesdb
mdoc: sort SEE ALSO.
2014-12-26 21:56:23 +00:00
mkesdb_static
NO_WARNS when building for host
2015-06-14 03:34:09 +00:00
mkfifo
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mkimg
Add the ntfs alias and support it with the MBR and GPT schemes
2015-06-27 03:28:04 +00:00
mklocale
new depends
2015-06-16 23:37:19 +00:00
mkstr
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mktemp
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mkulzma
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mkuzip
Add META_MODE support.
2015-06-13 19:20:56 +00:00
msgs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
mt
Add META_MODE support.
2015-06-13 19:20:56 +00:00
nc
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ncal
Add META_MODE support.
2015-06-13 19:20:56 +00:00
netstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
newgrp
Add META_MODE support.
2015-06-13 19:20:56 +00:00
newkey
Add META_MODE support.
2015-06-13 19:20:56 +00:00
nfsstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
nice
Add META_MODE support.
2015-06-13 19:20:56 +00:00
nl
Add META_MODE support.
2015-06-13 19:20:56 +00:00
nm
new depends
2015-06-16 23:37:19 +00:00
nohup
Add META_MODE support.
2015-06-13 19:20:56 +00:00
opieinfo
Add META_MODE support.
2015-06-13 19:20:56 +00:00
opiekey
Add META_MODE support.
2015-06-13 19:20:56 +00:00
opiepasswd
Add META_MODE support.
2015-06-13 19:20:56 +00:00
pagesize
Add META_MODE support.
2015-06-13 19:20:56 +00:00
pamtest
Add META_MODE support.
2015-06-13 19:20:56 +00:00
passwd
Add META_MODE support.
2015-06-13 19:20:56 +00:00
paste
Add META_MODE support.
2015-06-13 19:20:56 +00:00
patch
patch(1): small include changes.
2015-04-20 22:15:18 +00:00
pathchk
Add META_MODE support.
2015-06-13 19:20:56 +00:00
perror
Add META_MODE support.
2015-06-13 19:20:56 +00:00
pr
Add META_MODE support.
2015-06-13 19:20:56 +00:00
printenv
Add META_MODE support.
2015-06-13 19:20:56 +00:00
printf
Add META_MODE support.
2015-06-13 19:20:56 +00:00
procstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
protect
Reassign copyright statements on several files from Advanced
2015-04-23 14:22:20 +00:00
quota
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rctl
Add META_MODE support.
2015-06-13 19:20:56 +00:00
readelf
new depends
2015-06-16 23:37:19 +00:00
renice
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rev
Add META_MODE support.
2015-06-13 19:20:56 +00:00
revoke
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rlogin
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rpcgen
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rpcinfo
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rsh
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rup
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ruptime
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rusers
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rwall
Add META_MODE support.
2015-06-13 19:20:56 +00:00
rwho
Add META_MODE support.
2015-06-13 19:20:56 +00:00
script
Add META_MODE support.
2015-06-13 19:20:56 +00:00
sed
Add META_MODE support.
2015-06-13 19:20:56 +00:00
send-pr
Add a stub send-pr that simply points people towards the online support
2014-06-17 12:59:03 +00:00
seq
Add META_MODE support.
2015-06-13 19:20:56 +00:00
setchannel
Add META_MODE support.
2015-06-13 19:20:56 +00:00
shar
Add META_MODE support.
2015-06-13 19:20:56 +00:00
showmount
Add META_MODE support.
2015-06-13 19:20:56 +00:00
size
new depends
2015-06-16 23:37:19 +00:00
smbutil
Add META_MODE support.
2015-06-13 19:20:56 +00:00
sockstat
- Add SOCK_SEQPACKET support in UNIX-domain socket.
2015-06-20 08:59:50 +00:00
soelim
* fix roff terminology in .Nd
2015-05-21 08:28:48 +00:00
sort
new depends
2015-06-16 23:37:19 +00:00
split
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ssh-copy-id
Add META_MODE support.
2015-06-13 19:20:56 +00:00
stat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
stdbuf
Add META_MODE support.
2015-06-13 19:20:56 +00:00
strings
new depends
2015-06-16 23:37:19 +00:00
su
Add META_MODE support.
2015-06-13 19:20:56 +00:00
svn
Add META_MODE support.
2015-06-13 19:20:56 +00:00
systat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tabs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tail
Add META_MODE support.
2015-06-13 19:20:56 +00:00
talk
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tar
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tcopy
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tee
Add META_MODE support.
2015-06-13 19:20:56 +00:00
telnet
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tests
…
tftp
Add META_MODE support.
2015-06-13 19:20:56 +00:00
time
Add META_MODE support.
2015-06-13 19:20:56 +00:00
timeout
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tip
Add META_MODE support.
2015-06-13 19:20:56 +00:00
top
new depends
2015-06-16 23:37:19 +00:00
touch
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tput
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tr
Add META_MODE support.
2015-06-13 19:20:56 +00:00
true
Add META_MODE support.
2015-06-13 19:20:56 +00:00
truncate
Add META_MODE support.
2015-06-13 19:20:56 +00:00
truss
new depends
2015-06-16 23:37:19 +00:00
tset
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tsort
Add META_MODE support.
2015-06-13 19:20:56 +00:00
tty
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ul
Add META_MODE support.
2015-06-13 19:20:56 +00:00
uname
Add META_MODE support.
2015-06-13 19:20:56 +00:00
unexpand
Add META_MODE support.
2015-06-13 19:20:56 +00:00
unifdef
Add META_MODE support.
2015-06-13 19:20:56 +00:00
uniq
Add META_MODE support.
2015-06-13 19:20:56 +00:00
units
Only initialize libedit when necessary
2015-06-28 16:43:07 +00:00
unvis
Add META_MODE support.
2015-06-13 19:20:56 +00:00
unzip
Add META_MODE support.
2015-06-13 19:20:56 +00:00
usbhidaction
Add META_MODE support.
2015-06-13 19:20:56 +00:00
usbhidctl
Add META_MODE support.
2015-06-13 19:20:56 +00:00
users
Add META_MODE support.
2015-06-13 19:20:56 +00:00
uudecode
Add META_MODE support.
2015-06-13 19:20:56 +00:00
uuencode
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vacation
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vgrind
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vi
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vis
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vmstat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
vtfontcvt
Add META_MODE support.
2015-06-13 19:20:56 +00:00
w
Add META_MODE support.
2015-06-13 19:20:56 +00:00
wall
Add META_MODE support.
2015-06-13 19:20:56 +00:00
wc
Add META_MODE support.
2015-06-13 19:20:56 +00:00
what
Add META_MODE support.
2015-06-13 19:20:56 +00:00
whereis
Add META_MODE support.
2015-06-13 19:20:56 +00:00
which
Add META_MODE support.
2015-06-13 19:20:56 +00:00
who
Add META_MODE support.
2015-06-13 19:20:56 +00:00
whois
Add META_MODE support.
2015-06-13 19:20:56 +00:00
write
Add META_MODE support.
2015-06-13 19:20:56 +00:00
xargs
Add META_MODE support.
2015-06-13 19:20:56 +00:00
xinstall
short circuit install -l rs
2015-06-26 23:55:02 +00:00
xlint
new depends
2015-06-16 23:37:19 +00:00
xo
Convert to usr.bin/ to LIBADD
2014-11-25 14:29:10 +00:00
xstr
Add META_MODE support.
2015-06-13 19:20:56 +00:00
xz
Add META_MODE support.
2015-06-13 19:20:56 +00:00
xzdec
Add META_MODE support.
2015-06-13 19:20:56 +00:00
yacc
Add META_MODE support.
2015-06-13 19:20:56 +00:00
yes
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ypcat
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ypmatch
Add META_MODE support.
2015-06-13 19:20:56 +00:00
ypwhich
Add META_MODE support.
2015-06-13 19:20:56 +00:00
Makefile
Remove old fmake. It wasn't built by default for some time. Users that
2015-06-16 20:58:33 +00:00
Makefile.amd64
…
Makefile.arm
…
Makefile.i386
…
Makefile.inc
…
Makefile.powerpc
…
Makefile.sparc64
…