[gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Mark David Dumlao]

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I want to do this:
http://blog.internetnews.com/skerner/2010/11/forget-200-lines-red-hat-speed.html

in userspace, but automate it at boot time. it requires that I create and
mount the cgroup subsystem in sysfs and sounds a lot like something that I'd
do in sysctl for /proc/sys, but for sysfs rather than procfs.

The only thing that comes to mind is to append to the local init script, but
it's so close to what sysctl does that I feel like someone's probably
written some tool for it. Is there one?
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Re: [gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Mick]

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On Monday 27 December 2010 11:37:29 Mark David Dumlao wrote:
> I want to do this:
> http://blog.internetnews.com/skerner/2010/11/forget-200-lines-red-hat-speed
> .html
> 
> in userspace, but automate it at boot time. it requires that I create and
> mount the cgroup subsystem in sysfs and sounds a lot like something that
> I'd do in sysctl for /proc/sys, but for sysfs rather than procfs.
> 
> The only thing that comes to mind is to append to the local init script,
> but it's so close to what sysctl does that I feel like someone's probably
> written some tool for it. Is there one?

If there is, I haven't seen it.  Perhaps you can try adding it to 
/etc/conf.d/local.start and report back if it behaves as expected?
-- 
Regards,
Mick

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Re: [gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Adam Carter]

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> On Monday 27 December 2010 11:37:29 Mark David Dumlao wrote:
> > I want to do this:
> >
> http://blog.internetnews.com/skerner/2010/11/forget-200-lines-red-hat-speed
> > .html
> >
> > in userspace, but automate it at boot time. it requires that I create and
> > mount the cgroup subsystem in sysfs and sounds a lot like something that
> > I'd do in sysctl for /proc/sys, but for sysfs rather than procfs.
> >
> > The only thing that comes to mind is to append to the local init script,
> > but it's so close to what sysctl does that I feel like someone's probably
> > written some tool for it. Is there one?
>
>
Have you read;
http://en.gentoo-wiki.com/wiki/Improve_responsiveness_with_cgroups

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Re: [gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Volker Armin Hemmann]

On Monday 27 December 2010 19:37:29 Mark David Dumlao wrote:
> I want to do this:
> http://blog.internetnews.com/skerner/2010/11/forget-200-lines-red-hat-speed.
> html
> 
> in userspace, but automate it at boot time. it requires that I create and
> mount the cgroup subsystem in sysfs and sounds a lot like something that I'd
> do in sysctl for /proc/sys, but for sysfs rather than procfs.
> 
> The only thing that comes to mind is to append to the local init script, but
> it's so close to what sysctl does that I feel like someone's probably
> written some tool for it. Is there one?

why?

why not just patch the kernel? or wait for 2.6.37? Why trying the easily 
broken userspace approach?

btw - patch or userspace - what happens with apps not started from a shell?

Re: [gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Mark David Dumlao]

On Wed, Dec 29, 2010 at 9:54 AM, Volker Armin Hemmann
<volkerarmin@googlemail.com> wrote:
>
> On Monday 27 December 2010 19:37:29 Mark David Dumlao wrote:
> > I want to do this:
> > http://blog.internetnews.com/skerner/2010/11/forget-200-lines-red-hat-speed.
> > html
> >
> > in userspace, but automate it at boot time. it requires that I create and
> > mount the cgroup subsystem in sysfs and sounds a lot like something that I'd
> > do in sysctl for /proc/sys, but for sysfs rather than procfs.
> >
> > The only thing that comes to mind is to append to the local init script, but
> > it's so close to what sysctl does that I feel like someone's probably
> > written some tool for it. Is there one?
>
> why?
>
> why not just patch the kernel? or wait for 2.6.37? Why trying the easily
> broken userspace approach?

I disagree. I think userspace is the best place to do this, not
kernelspace, especially as I'm considering customizing the cgroup
behavior further than that. I'm not sure why I'd call the userspace
approach broken. It's different, not broken.

>
> btw - patch or userspace - what happens with apps not started from a shell?
>
Well according to the wiki article posted uses shell, and it doesn't
affect non-shell behavior.

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Re: [gentoo-user] Is there a standard sysctl-like way to modify sysfs files at boot time?

[Mark David Dumlao]

Neat thing, after I finished my kernel compile and did a reboot, the
/sys/fs/cgroup directory appears by default, so I don't need to mkdir
and can directly just place it in fstab.

With zen-sources, at least, but it sounds like what upstream behavior should do.
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