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On Thu, Jul 07, 2005 at 10:18:12AM -0400, Chris Gianelloni wrote: |
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> On Wed, 2005-07-06 at 15:46 -0700, Greg KH wrote: |
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> > To start with, the 061 version of udev offers a big memory savings if |
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> > you use the "default" kernel name of a device[3]. If you do that, it does |
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> > not create a file in its database in /dev/.udevdb/ |
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> |
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> So if we were to switch to udev 061 in genkernel, it would shrink memory |
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> usage in our initrd/initramfs, provided we made everything use the LSB |
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> device names/nodes, versus the devfs ones, correct? |
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|
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Not in the initrd/initramfs, but in the tmpfs partition that udev uses |
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to create the /dev entries. Well, I guess you could say the |
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"initrd/initramfs" if that is where udev is mounted on early startup (I |
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haven't looked at how genkernel does this in a long time, sorry.) |
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|
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And yes, the memory savings is there, if we use the LSB names only vs |
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the devfs name and the symlink like we currently do. |
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|
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To see this, look at how much space /dev/.udevdb/ takes up right now |
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with 062 udev. Then change the following rules in |
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/etc/udev/rules.d/50-udev.rules with the diff at the end of this email. |
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Then reboot and look at the size of the /dev/.udevdb/ directory again. |
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I think you will notice a huge space savings. |
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|
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thanks, |
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|
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greg k-h |
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|
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--- 50-udev.rules.orig 2005-07-08 10:10:24.000000000 -0700 |
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+++ 50-udev.rules 2005-07-08 10:11:16.000000000 -0700 |
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@@ -139,9 +139,9 @@ |
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# tty devices |
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KERNEL=="console", NAME="%k", GROUP="tty", MODE="0600" |
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KERNEL=="tty", NAME="%k", GROUP="tty", MODE="0666" |
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-KERNEL=="tty[0-9]*", NAME="vc/%n", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="ttyS[0-9]*", NAME="tts/%n", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="ttyUSB[0-9]*", NAME="tts/USB%n", GROUP="tty", MODE="0660" |
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+KERNEL=="tty[0-9]*", NAME="%k", GROUP="tty" |
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+KERNEL=="ttyS[0-9]*", NAME="%k", GROUP="tty" |
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+KERNEL=="ttyUSB[0-9]*", NAME="%k", GROUP="tty", MODE="0660" |
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KERNEL=="ippp0", NAME="%k", GROUP="tty" |
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KERNEL=="isdn*" NAME="%k", GROUP="tty" |
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KERNEL=="dcbri*", NAME="%k", GROUP="tty" |
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@@ -149,14 +149,14 @@ |
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|
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# pty devices |
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KERNEL=="ptmx", NAME="%k", GROUP="tty", MODE="0666" |
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-KERNEL=="pty[p-za-e][0-9a-f]*", NAME="pty/m%n", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="tty[p-za-e][0-9a-f]*", NAME="pty/s%n", SYMLINK+="%k", GROUP="tty" |
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+KERNEL=="pty[p-za-e][0-9a-f]*", NAME="%k", GROUP="tty" |
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+KERNEL=="tty[p-za-e][0-9a-f]*", NAME="%k", GROUP="tty" |
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|
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# vc devices |
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-KERNEL=="vcs", NAME="vcc/0", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="vcs[0-9]*", NAME="vcc/%n", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="vcsa", NAME="vcc/a0", SYMLINK+="%k", GROUP="tty" |
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-KERNEL=="vcsa[0-9]*", NAME="vcc/a%n", SYMLINK+="%k", GROUP="tty" |
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+KERNEL=="vcs", NAME="%k", GROUP="tty" |
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+KERNEL=="vcs[0-9]*", NAME="%k", GROUP="tty" |
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+KERNEL=="vcsa", NAME="%k", GROUP="tty" |
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+KERNEL=="vcsa[0-9]*", NAME="%k", GROUP="tty" |
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|
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# memory devices |
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KERNEL=="random", NAME="%k", MODE="0666" |
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-- |
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