On Fri, 2006-08-04 at 18:01 -0700, Joel Becker wrote:
> On Fri, Aug 04, 2006 at 03:58:58PM -0700, Paul Menage wrote:
> > On 8/4/06, Matt Helsley <[EMAIL PROTECTED]> wrote:
> > >Yes. Can userspace do a mkdir in sysfs? rmdir? My understanding is it
> > >cannot because sysfs directories represent groups of attributes the
> > >represent pre-existing kernel objects. In order to create a directory
> > >we'd likely have to invent some roundabout method for creating these
> > >objects -- perhaps by echo'ing to a file:
> > >
> > >echo 'classes/foo/bar/baz' > /sys/ckrm/mkdir
> >
> > Why is this worse than doing a mkdir() syscall?
> >
> > Alternatively and perhaps more cleanly,
> >
> > echo baz > /sys/ckrm/foo/bar/.create
>
> There's no reason that the mkdir(2) in configfs can't trigger
> an object appearing in sysfs.
>
> # mkdir config/ckrm/groups/myresourcegroup
> # ls config/ckrm/groups/myresourcegroup
> tunables status
> # ls sys/ckrm/groups/myresourcegroup
> members
>
> Or something along those lines. You'd just have that in your
> make_object() callback.
When the user wants to move a task to a resource group they just write
the pid to the members file. So, it is natural to expect the same file
to display the current members instead of looking at a different file in
a different filesystem.
>
> Joel
>
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