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

H.J. Lu hjl.tools@gmail.com
Mon Jun 1 20:15:59 GMT 2020


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.

> The alternative is a glibc-tunables binary which does only this, but
> that seems like waste.
>
> Cheers,
> Carlos.
>


-- 
H.J.


More information about the Libc-alpha mailing list