[Bug dynamic-link/25051] aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos

[Bug dynamic-link/25051] aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos

[mitya57 at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25051

Dmitry Shachnev <mitya57 at debian dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mitya57 at debian dot org

--- Comment #3 from Dmitry Shachnev <mitya57 at debian dot org> ---
We got bug reports about a similar issue in Debian [1] (which affects PyQt5 and
PySide packages on aarch64).

The latest version (v5) of the patch from [2] works, thanks!

[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964141
[2]: https://sourceware.org/pipermail/libc-alpha/2020-June/115284.html

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[Bug dynamic-link/25051] aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25051

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Szabolcs Nagy <nsz@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ffb17e7ba3a5ba9632cee97330b325072fbe41dd

commit ffb17e7ba3a5ba9632cee97330b325072fbe41dd
Author: Szabolcs Nagy <szabolcs.nagy@arm.com>
Date:   Wed Jun 10 13:40:40 2020 +0100

    rtld: Avoid using up static TLS surplus for optimizations [BZ #25051]

    On some targets static TLS surplus area can be used opportunistically
    for dynamically loaded modules such that the TLS access then becomes
    faster (TLSDESC and powerpc TLS optimization). However we don't want
    all surplus TLS to be used for this optimization because dynamically
    loaded modules with initial-exec model TLS can only use surplus TLS.

    The new contract for surplus static TLS use is:

    - libc.so can have up to 192 bytes of IE TLS,
    - other system libraries together can have up to 144 bytes of IE TLS.
    - Some "optional" static TLS is available for opportunistic use.

    The optional TLS is now tunable: rtld.optional_static_tls, so users
    can directly affect the allocated static TLS size. (Note that module
    unloading with dlclose does not reclaim static TLS. After the optional
    TLS runs out, TLS access is no longer optimized to use static TLS.)

    The default setting of rtld.optional_static_tls is 512 so the surplus
    TLS is 3*192 + 4*144 + 512 = 1664 by default, the same as before.

    Fixes BZ #25051.

    Tested on aarch64-linux-gnu and x86_64-linux-gnu.

    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

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[Bug dynamic-link/25051] aarch64, powerpc64 uses surplus static tls for dynamically loaded dsos

[nsz at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25051

Szabolcs Nagy <nsz at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.32
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Szabolcs Nagy <nsz at gcc dot gnu.org> ---
fixed for 2.32.

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