Re: [PATCH] ksm: Expose configuration via sysctl

[Sven-Haegar Koch <haegar@sdinet.de>]

On Tue, 25 Feb 2014, Dave Hansen wrote:

> On 02/25/2014 03:09 PM, Alexander Graf wrote:
> >> Couldn't we also (maybe in parallel) just teach the sysctl userspace
> >> about sysfs?  This way we don't have to do parallel sysctls and sysfs
> >> for *EVERYTHING* in the kernel:
> >>
> >>    sysfs.kernel.mm.transparent_hugepage.enabled=enabled
> > 
> > It's pretty hard to filter this. We definitely do not want to expose all of sysfs through /proc/sys. But how do we know which files are actual configuration and which ones are dynamic system introspection data?
> > 
> > We could add a filter, but then we can just as well stick with the manual approach I followed here :).
> 
> Maybe not stick it under /proc/sys, but teach sysctl(8) about them.  I
> guess at the moment, sysctl says that it's tied to /proc/sys:
> 
> > DESCRIPTION
> >        sysctl  is  used to modify kernel parameters at runtime.  The parameters available are those listed under /proc/sys/.  Procfs is required
> >        for sysctl support in Linux.  You can use sysctl to both read and write sysctl data.
> 
> But surely that's not set in stone just because the manpage says so. :)

What I still don't get is why you need this?

My distribution (Debian) has a sysfsutils package which provides a 
/etc/sysfs.conf / /etc/sysfs.d/foo exactly like /etc/sysctl.conf.

Don't other distributions have something like this?

c'ya
sven-haegar

-- 
Three may keep a secret, if two of them are dead.
- Ben F.

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