Re: + restore-missing-sysfs-max_cstate-attr.patch added to -mm tree

[Mark Lord]

Mark Lord wrote:
> Arjan van de Ven wrote:
> > On Fri, 30 Nov 2007 22:44:25 -0500
> > Mark Lord <lkml@xxxxxx> wrote:
> > > > all you need to do in your kernel module is call
...
> > set_acceptable_latency("mark", 5);
> >
> > and to remove the constraint again you just do
> >
> > remove_acceptable_latency("mark");
..
> > > Then why not have a sysfs entry for scripts to write tsoro
> > > to trigger the exact same end result?  :)
> >
> > that's what is in current -mm pretty much
> > well not sysfs, but it goes via a file descriptor
> > (so that if the process that sets the contraint dies, the latency
> > requirement can be given up automatically)
> ...
>
> But doesn't that approach also make it nearly impossible to script ????
...

Okay, I have a working trivial kernel module that I can load/unload
to tweak this.  But a simple sysfs attribute would be *so much* better
as a permanent kernel feature.

Binary interfaces (fd) are fine for some uses, but not nice for scripts.

Cheers
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