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Re: [PATCH 0/2] tunables for glibc


On Sat, Jul 2, 2016 at 10:12 AM, Siddhesh Poyarekar
<siddhesh@sourceware.org> wrote:
> Hi,
>
> Here's another stab at the tunables patchset.  This patch now gets tunables
> working with static binaries as well.
>
> The tunables framework aims to provide a simple and consistent interface for
> the library to expose tuning switches in a much more coherent manner to
> userspace.  In its initial form, the framework will allow users to tweak
> certain parts of the library using an environment variable (or set of
> environment variables, depending on where the consensus sends us).  In future,
> this could be extended to per-user or even systemwide tuning switches.
>
> The first patch implements a bare framework that moves the environment
> variables in the malloc module to the tunables framework without adding any new
> user-visible functionality.  The environment variables that were implemented
> earlier should work as is.
>
> The second patch adds support for a GLIBC_TUNABLES environment variable, which
> users can use to set up tunables instead of using the old environment
> variables.  The alternative approach to this is to expose namespace-consistent
> environment variables for each tunable for userspace to take advantage of
> instead of the earlier environment variables.
>
> Siddhesh Poyarekar (2):
>   Add framework for tunables
>   Initialize tunable list with the GLIBC_TUNABLES environment variable
>
>  INSTALL                           |   6 +
>  Makeconfig                        |  16 +++
>  README.tunables                   |  74 ++++++++++++
>  config.h.in                       |   3 +
>  config.make.in                    |   1 +
>  configure                         |  16 +++
>  configure.ac                      |  10 ++
>  csu/init-first.c                  |   7 ++
>  elf/Makefile                      |   5 +
>  elf/Versions                      |   3 +
>  elf/dl-tunable-types.h            |  45 +++++++
>  elf/dl-tunables.c                 | 241 ++++++++++++++++++++++++++++++++++++++
>  elf/dl-tunables.h                 |  76 ++++++++++++
>  elf/dl-tunables.list              |  50 ++++++++
>  elf/rtld.c                        |   8 ++
>  malloc/Makefile                   |   3 +
>  malloc/arena.c                    |  35 ++++++
>  malloc/tst-malloc-usable-static.c |   1 +
>  manual/install.texi               |   5 +
>  scripts/gen-tunables.awk          | 157 +++++++++++++++++++++++++
>  20 files changed, 762 insertions(+)
>  create mode 100644 README.tunables
>  create mode 100644 elf/dl-tunable-types.h
>  create mode 100644 elf/dl-tunables.c
>  create mode 100644 elf/dl-tunables.h
>  create mode 100644 elf/dl-tunables.list
>  create mode 100644 malloc/tst-malloc-usable-static.c
>  create mode 100644 scripts/gen-tunables.awk
>

Can you push you new patches to siddhesh/tunables branch so
that I can give it a try?

Thanks.

-- 
H.J.


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