V4 [PATCH 0/2] ld.so: Add --list-tunables to print tunable values

["H.J. Lu" <hjl.tools@gmail.com>]

Tunable values and their minimum/maximum values are invisible to users.
This patch set adds --list-tunables to ld.so to print tunable values
with their minimum and maximum values.

--list-tunables works on i686 and x86-64.  Please test --list-tunables on
your native processors.  users/hjl/tunable/master branch at:

https://gitlab.com/x86-glibc/glibc/-/commits/users/hjl/tunable/master

contains the same set of patches.

On x86, to make cache info accessible to --list-tunables, they are moved
to cpu_features in ld.so and TUNABLE_SET_WITH_BOUNDS is used to update
tunable bounds.

Rebased on top of

commit cb3a749a22a55645dc6a52659eea765300623f98
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Oct 28 15:53:26 2020 +0100

    x86: Restore processing of cache size tunables in init_cacheinfo

H.J. Lu (2):
  x86: Move x86 processor cache info to cpu_features
  ld.so: Add --list-tunables to print tunable values

 NEWS                               |   2 +
 elf/Makefile                       |   8 +
 elf/dl-main.h                      |   2 +-
 elf/dl-tunables.c                  |  36 +++
 elf/dl-tunables.h                  |   2 +
 elf/dl-usage.c                     |   7 +-
 elf/rtld.c                         |  23 ++
 manual/tunables.texi               |  37 +++
 sysdeps/x86/cacheinfo.c            |  46 ++-
 sysdeps/x86/cacheinfo.h            | 400 ++-----------------------
 sysdeps/x86/cpu-features.c         |  35 +--
 sysdeps/x86/dl-cacheinfo.h         | 460 +++++++++++++++++++++++++++++
 sysdeps/x86/include/cpu-features.h |  22 ++
 13 files changed, 666 insertions(+), 414 deletions(-)

-- 
2.28.0