5bce135e36
Sequential run of concurrent mdev's was too simplistic:
they waited for /dev/mdev.seq to match. This could sometimes
cause cumulative loss of time on the order of a second.
Added SIGCHLD signaling from exiting mdev to all other mdev's.
Added debugging required to see that code actually works as intended.
Example of /dev/mdev.log (with "woken up" elevated from dbg lvl 3 to 2):
mdev[1023]: first seq written
^^^^ seq, not pid
mdev[1023]: 35.022395 ACTION:add SUBSYSTEM:module DEVNAME:(null) DEVPATH:/module/lib80211
mdev[1023]: rule matched, line -1
^^^^^^^ means "default rule"
mdev[1023]: 35.022676 exiting
^^^^^^^^^ second,usec timestamp
mdev[1024]: 35.069691 ACTION:add SUBSYSTEM:vc DEVNAME:vcs9 DEVPATH:/devices/virtual/vc/vcs9
mdev[1024]: dev 7,9
mdev[1025]: 35.069889 waiting for '1024'
mdev[1026]: 35.069946 waiting for '1024'
mdev[1027]: 35.070151 waiting for '1024'
mdev[1024]: rule matched, line -1
mdev[1024]: mknod vcs9 (7,9) 20660 0:0
mdev[1024]: 35.070346 exiting
mdev[1025]: woken up
mdev[1026]: woken up
mdev[1025]: 35.071213 ACTION:add SUBSYSTEM:vc DEVNAME:vcsa9 DEVPATH:/devices/virtual/vc/vcsa9
^^^^^^^^^ took only a millisecond to start running after prev mdev exited
mdev[1025]: dev 7,137
mdev[1027]: woken up
mdev[1025]: rule matched, line -1
mdev[1025]: mknod vcsa9 (7,137) 20660 0:0
mdev[1025]: 35.072109 exiting
function old new delta
mdev_main 849 1372 +523
curtime - 59 +59
dirAction 87 134 +47
static.ts - 8 +8
keywords 19 12 -7
make_device 2189 2119 -70
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
115 lines
3.0 KiB
Plaintext
115 lines
3.0 KiB
Plaintext
#
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# This is a sample mdev.conf
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#
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# Provide user, group, and mode information for devices. If a regex matches
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# the device name provided by sysfs, use the appropriate user:group and mode
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# instead of the default 0:0 660.
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#
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# Syntax:
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# [-][ENVVAR=regex;]...devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-][ENVVAR=regex;]...@maj,min[-min2] user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]$ENVVAR=regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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#
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# [-]: do not stop on this match, continue reading mdev.conf
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# =: move, >: move and create a symlink
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# !: do not create device node
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# @|$|*: run cmd if $ACTION=remove, @cmd if $ACTION=add, *cmd in all cases
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# support module loading on hotplug
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$MODALIAS=.* root:root 660 @modprobe "$MODALIAS"
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# null may already exist; therefore ownership has to be changed with command
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null root:root 666 @chmod 666 $MDEV
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zero root:root 666
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full root:root 666
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random root:root 444
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urandom root:root 444
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hwrandom root:root 444
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grsec root:root 660
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kmem root:root 640
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mem root:root 640
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port root:root 640
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# console may already exist; therefore ownership has to be changed with command
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console root:tty 600 @chmod 600 $MDEV
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ptmx root:tty 666
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pty.* root:tty 660
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# Typical devices
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tty root:tty 666
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tty[0-9]* root:tty 660
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vcsa*[0-9]* root:tty 660
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ttyS[0-9]* root:uucp 660
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# block devices
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ram([0-9]*) root:disk 660 >rd/%1
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loop([0-9]+) root:disk 660 >loop/%1
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sd[a-z].* root:disk 660 */lib/mdev/usbdisk_link
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hd[a-z][0-9]* root:disk 660 */lib/mdev/ide_links
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md[0-9]* root:disk 660
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sr[0-9]* root:cdrom 660 @ln -sf $MDEV cdrom
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fd[0-9]* root:floppy 660
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# net devices
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SUBSYSTEM=net;.* root:root 600 @nameif
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tun[0-9]* root:root 600 =net/
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tap[0-9]* root:root 600 =net/
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# alsa sound devices and audio stuff
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pcm.* root:audio 660 =snd/
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control.* root:audio 660 =snd/
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midi.* root:audio 660 =snd/
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seq root:audio 660 =snd/
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timer root:audio 660 =snd/
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adsp root:audio 660 >sound/
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audio root:audio 660 >sound/
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dsp root:audio 660 >sound/
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mixer root:audio 660 >sound/
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sequencer.* root:audio 660 >sound/
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# Less typical devices
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# raid controllers
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cciss!(.*) root:disk 660 =cciss/%1
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ida!(.*) root:disk 660 =ida/%1
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rd!(.*) root:disk 660 =rd/%1
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ttyLTM[0-9] root:dialout 660 @ln -sf $MDEV modem
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ttySHSF[0-9] root:dialout 660 @ln -sf $MDEV modem
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slamr root:dialout 660 @ln -sf $MDEV slamr0
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slusb root:dialout 660 @ln -sf $MDEV slusb0
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fuse root:root 666
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# dri device
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card[0-9] root:video 660 =dri/
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# misc stuff
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agpgart root:root 660 >misc/
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psaux root:root 660 >misc/
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rtc root:root 664 >misc/
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# input stuff
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event[0-9]+ root:root 640 =input/
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mice root:root 640 =input/
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mouse[0-9] root:root 640 =input/
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ts[0-9] root:root 600 =input/
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# v4l stuff
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vbi[0-9] root:video 660 >v4l/
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video[0-9] root:video 660 >v4l/
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# dvb stuff
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dvb.* root:video 660 */lib/mdev/dvbdev
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# load drivers for usb devices
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usbdev[0-9].[0-9] root:root 660 */lib/mdev/usbdev
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usbdev[0-9].[0-9]_.* root:root 660
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# zaptel devices
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zap(.*) root:dialout 660 =zap/%1
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dahdi!(.*) root:dialout 660 =dahdi/%1
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