On Tue, Feb 25, 2014 at 12:15:28PM -0500, Johannes Weiner wrote:
> On Tue, Feb 25, 2014 at 12:28:04AM +0100, Alexander Graf wrote:
> > Configuration of tunables and Linux virtual memory settings has traditionally
> > happened via sysctl. Thanks to that there are well established ways to make
> > sysctl configuration bits persistent (sysctl.conf).
> >
> > KSM introduced a sysfs based configuration path which is not covered by user
> > space persistent configuration frameworks.
> >
> > In order to make life easy for sysadmins, this patch adds all access to all
> > KSM tunables via sysctl as well. That way sysctl.conf works for KSM as well,
> > giving us a streamlined way to make KSM configuration persistent.
> >
> > Reported-by: Sasche Peilicke <speilicke@xxxxxxxx>
> > Signed-off-by: Alexander Graf <agraf@xxxxxxx>
> > ---
> > kernel/sysctl.c | 10 +++++++
> > mm/ksm.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 88 insertions(+), 0 deletions(-)
> >
> > diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> > index 332cefc..2169a00 100644
> > --- a/kernel/sysctl.c
> > +++ b/kernel/sysctl.c
> > @@ -217,6 +217,9 @@ extern struct ctl_table random_table[];
> > #ifdef CONFIG_EPOLL
> > extern struct ctl_table epoll_table[];
> > #endif
> > +#ifdef CONFIG_KSM
> > +extern struct ctl_table ksm_table[];
> > +#endif
> >
> > #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
> > int sysctl_legacy_va_layout;
> > @@ -1279,6 +1282,13 @@ static struct ctl_table vm_table[] = {
> > },
> >
> > #endif /* CONFIG_COMPACTION */
> > +#ifdef CONFIG_KSM
> > + {
> > + .procname = "ksm",
> > + .mode = 0555,
> > + .child = ksm_table,
> > + },
> > +#endif
>
> ksm can be a module, so this won't work.
>
> Can we make those controls proper module parameters instead?
You can do dynamic sysctl registration and removal. Its its own little
filesystem of sorts.
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