[PATCH] x86: Add thresholds for "rep movsb/stosb" to tunables

H.J. Lu hjl.tools@gmail.com
Mon Jun 1 20:19:52 GMT 2020


On Mon, Jun 1, 2020 at 1:15 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Mon, Jun 1, 2020 at 12:38 PM Carlos O'Donell <carlos@redhat.com> wrote:
> >
> > On Mon, Jun 1, 2020 at 3:33 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> > > Did you mean adding  --list-tunables to ld.so?  libc.so.6 doesn't take
> > > any arguments.
> >
> > Yes, I mean adding argument processing to libc.so.6, and handling
> > --list-tunables.
> >
> > We have enough infrastructure in place that wiring that up shouldn't be too bad?
> >
> > Then, even in trimmed down containers, you can just run
> > /lib64/libc.so.6 --list-tunables and get back the list of tunables and
> > their min, max, and security values.
>
> Adding an argument to libc.so.6 is difficult since argument passing is
> processor specific.  Adding --list-tunables to ld.so is more doable.

But tunables are in libc.so.


-- 
H.J.


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