Easy alternative to the new 200 line kernel patch

**simpleblue** · 19th November 2010, 11:35 PM

Originally Posted by JONOR

@ simpleblue; Are you using Fedora, as RupertPupkin's suggestion is code for Fedora ?

Also when you say :

is that without entering any mkdir command into the terminal ?

Yes, I'm using Fedora 14.

I started entering these commands in terminal:

Code:

mount -t cgroup cgroup /sys/fs/cgroup/cpu -o cpu
mkdir -m 0777 /sys/fs/cgroup/cpu/user

Then when it didn't work I entered in the Ubuntu instructions below:

mkdir -p /dev/cgroup/cpu
mount -t cgroup cgroup /dev/cgroup/cpu -o cpu
mkdir -m 0777 /dev/cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /dev/cgroup/cpu/release_agent

and make it executable:
sudo chmod +x /etc/rc.local

And then add the following to your ~/.bashrc file (to open it: gedit ~/.bashrc):

if [ "$PS1" ] ; then
mkdir -p -m 0700 /dev/cgroup/cpu/user/$$ > /dev/null 2>&1
echo $$ > /dev/cgroup/cpu/user/$$/tasks
echo "1" > /dev/cgroup/cpu/user/$$/notify_on_release
fi

Run the following command:
sudo gedit /usr/local/sbin/cgroup_clean

And paste this:

#!/bin/sh
rmdir /dev/cgroup/cpu/$*

then save the file and make it executable:
sudo chmod +x /usr/local/sbin/cgroup_clean

And finally, restart the computer or manually run the /etc/rc.local file ("sudo /etc/rc.local").

**JONOR** · 20th November 2010, 12:03 AM

For Fedora i suggest ignoring that other/ubuntu code and following RupertPupkin (post 4) and Schurke (post 11) after having made backups.
Am i right in assuming you have modified code for identifying your OS as there is a penguin on the R.H.S. not a Fedora symbol ?

**schurke** · 20th November 2010, 12:10 AM

@simpleblue -you've got Ubuntu's paths there, try fixing it for Fedora:

as root

Code:

service cgconfig start

and

Code:

chkconfig --level 2345 cgconfig on

in /etc/rc.local

Code:

mkdir -m 0777 /cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /cgroup/cpu/release_agent

then in /usr/local/sbin/cgroup_clean

Code:

#!/bin/sh
rmdir /cgroup/cpu/user/$*

and make it exec with

Code:

chmod +x /usr/local/sbin/cgroup_clean

in user's ~/.bashrc

Code:

if [ "$PS1" ] ; then
mkdir -m 0700 /cgroup/cpu/user/$$
echo $$ > /cgroup/cpu/user/$$/tasks
echo "1" > /cgroup/cpu/user/$$/notify_on_release
fi

finally, a

Code:

sudo sh /etc/rc.local

should do...

**simpleblue** · 20th November 2010, 12:22 AM

I reentered this information:

For Fedora i suggest ignoring that other/ubuntu code and following RupertPupkin (post 4) and Schurke (post 11) after having made backups.
Am i right in assuming you have modified code for identifying your OS as there is a penguin on the R.H.S. not a Fedora symbol ?

And I have a penguin as my OS because I use Google Chrome dev edition.

And then I entered...

Originally Posted by schurke

@simpleblue -you've got Ubuntu's paths there, try fixing it for Fedora:

as root

Code:

service cgconfig start

and

Code:

chkconfig --level 2345 cgconfig on

in /etc/rc.local

Code:

mkdir -m 0777 /cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /cgroup/cpu/release_agent

then in /usr/local/sbin/cgroup_clean

Code:

#!/bin/sh
rmdir /cgroup/cpu/user/$*

and make it exec with

Code:

chmod +x /usr/local/sbin/cgroup_clean

in user's ~/.bashrc

Code:

if [ "$PS1" ] ; then
mkdir -m 0700 /cgroup/cpu/user/$$
echo $$ > /cgroup/cpu/user/$$/tasks
echo "1" > /cgroup/cpu/user/$$/notify_on_release
fi

finally, a

Code:

sudo sh /etc/rc.local

should do...

Thank you so much for putting all that together. I appreciate it!

I still do get this message as soon as I open up the terminal:

Code:

mkdir: cannot create directory `/sys/fs/cgroup/cpu/user/5313': No such file or directory
bash: /sys/fs/cgroup/cpu/user/5313/tasks: No such file or directory

My guess is that I've entered a script into a file and have not yet deleted it. Aside from that, everything seems fine.

**JONOR** · 20th November 2010, 12:34 AM

Might it be in /etc/rc.d/rc.local ?

And when you say fine is that the same speed

, faster

or slower

**simpleblue** · 20th November 2010, 12:44 AM

Originally Posted by JONOR

Might it be in /etc/rc.d/rc.local ?

I have this in etc/rc.d/rc.local:

Code:

#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

mkdir -m 0777 /cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /cgroup/cpu/release_agent

The ~/.bashrc has this:

Code:

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

# ANDRE edit... New speed patch by Lennart Poettering
if [ "$PS1" ] ; then
mkdir -m 0700 /cgroup/cpu/user/$$
echo $$ > /cgroup/cpu/user/$$/tasks
echo "1" > /cgroup/cpu/user/$$/notify_on_release
fi

etc/rc.local has this:

Code:

#!/bin/sh
#
# This script will be executed *after* all the other init scripts.
# You can put your own initialization stuff in here if you don't
# want to do the full Sys V style init stuff.

touch /var/lock/subsys/local

mkdir -m 0777 /cgroup/cpu/user
echo "/usr/local/sbin/cgroup_clean" > /cgroup/cpu/release_agent

I'm trying to find out where I have entered that script.

**dd_wizard** · 20th November 2010, 12:50 AM

Daniel asked:

Originally Posted by bart3005

Hi

Does one need to do any clean up?

The task folder in /cgroup/cpu/user/ seem to stay after he shell has been closed.

Regards
Daniel

Here's a link to a later post in the kernel patch thread that shows how to implement Lennart's method with clean up.

Enjoy,
dd_wizard

**simpleblue** · 20th November 2010, 01:08 AM

Originally Posted by JONOR

Might it be in /etc/rc.d/rc.local ?

And when you say fine is that the same speed

, faster

or slower

I'm testing it out by running 15 concurrent flash videos on VLC. Not a likely everyday activity.

Do I just remove the script from ~/.bashrc and etc/rc.d/rc.local to turn it off? I'd like to turn it off while all the vids are up so I can see immediate results if possible.

And thanks for the cleanup script dd_wizard!

*** Edit for Results so far ***

I took out the script for ~/.bashrc and had 21 flash videos running simultaneously in VLC. I did not notice a difference either way. I'm guessing I either didn't shut the scheduler patch off or it wasn't on to begin with. I think it might be best to wait until the kernel comes out unless anyone has any other ideas.

**RupertPupkin** · 20th November 2010, 04:45 AM

Originally Posted by JONOR

It might be a bit early to ask but do you notice any significant differences with the change ?

Yes, when I have lots of apps running everything is noticeably snappier than before.

**a_small_cake** · 21st November 2010, 12:11 AM

Could someone post here the numbers after applying this new magic patch?

**skyxn3t** · 21st November 2010, 09:36 AM

Well, this feature is pretty much interesting only for kernel hackers
anyway. It is completely irrelevant for normal desktop people. Because
a) normal users don't use many terminals anyway and that very seldom and
b) if they do that they do not create gazillion of processes from one of
the terminals and only very few in the other. Because only then this
patch becomes relevant.

http://marc.info/?l=linux-kernel&m=128993935321081&w=2

**Gödel** · 21st November 2010, 08:43 PM

Summary
========

Poettering says this is only worthwhile if you compile kernels with make -j64 all the time while doing other desktop work, and in any case it's stupid doing it in the kernel cos he's got an ever so clever method of doing it with userspace scripts.

Everyone else says, shut up Poettering, you haven't got a clue what people do on their desktops and a small kernel patch is an easy way to give the benefits without relying on userspace methods which are not cross-platform and fiddly.

I'd apply Poettering's userspace patch for now, and then forget about it. Those who care will be able to apply kernel patch as and when necessary.

**Zaulux** · 27th November 2010, 06:34 AM

Hi all,
Is there a way to check all changes go well?

"usemoslinux" page says at the end of the instructions:
"Note: if you see the directory /dev/cgroup/ you are going to note a considerable improvement in the multitasking management".

Is that true? I can't see that directory... but I guess it applies to ubuntu, and i'm fedora13...

http://usemoslinux.blogspot.com/2010...lizado-el.html

**bonedome** · 3rd December 2010, 12:08 AM

Hello
looks interesting so gave it a try, oops tripped at first hurdle (sort of) trying to start cgconfig I get this

Code:

[root@localhost ~]# service cgconfig start
Starting cgconfig service: Loading configuration file /etc/cgconfig.conf failed
Cgroup is not mounted
Failed to parse /etc/cgconfig.conf                         [FAILED]

any ideas ?

**schurke** · 3rd December 2010, 03:12 AM

Originally Posted by bonedome

any ideas ?

yup, something's wrong with your /etc/cgconfig.conf

check how far is it from something like

Code:

mount {
	cpuset	= /cgroup/cpuset;
	cpu	= /cgroup/cpu;
	cpuacct	= /cgroup/cpuacct;
	memory	= /cgroup/memory;
	devices	= /cgroup/devices;
	freezer	= /cgroup/freezer;
	net_cls	= /cgroup/net_cls;
	ns	= /cgroup/ns;
	blkio	= /cgroup/blkio;
}

Easy alternative to the new 200 line kernel patch

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