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From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 1 Jun 2020 13:19:52 -0700
Message-ID: <CAMe9rOozkitgy=BTQGUGNyFsOBs8MSzr=b+6vv5UQxVYu2AiQQ@mail.gmail.com>
Subject: Re: [PATCH] x86: Add thresholds for "rep movsb/stosb" to tunables
To: "Carlos O'Donell" <carlos@redhat.com>
Cc: liqingqing <liqingqing3@huawei.com>, Hushiyuan <hushiyuan@huawei.com>, 
 "libc-alpha@sourceware.org" <libc-alpha@sourceware.org>
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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.