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From: "cd_songkun at hotmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug dynamic-link/19924] TLS performance degradation after dlopen
Date: Thu, 25 Feb 2021 09:54:17 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D19924

--- Comment #16 from ksong <cd_songkun at hotmail dot com> ---
Refer http://patches-tcwg.linaro.org/patch/49142/
I also try backport these patch.
[01/15] aarch64: free tlsdesc data on dlclose [BZ #27403]
[02/15] elf: Fix data race in _dl_name_match_p [BZ #21349]
[03/15] Add test case for [BZ #19329]
[04/15] Add a DTV setup test [BZ #27136]
[05/15] elf: Fix a DTV setup issue [BZ #27136]
[06/15] elf: Fix comments and logic in _dl_add_to_slotinfo
[07/15] elf: Refactor _dl_update_slotinfo to avoid use after free
[08/15] elf: Fix data races in pthread_create and TLS access [BZ #19329]
[09/15] elf: Use relaxed atomics for racy accesses [BZ #19329]
[10/15] elf: Fix DTV gap reuse logic [BZ #27135]=20

and try to rebuild glibc, but for our testcase tls_mini, Performance has not
improved.

For below patch,=20
[11/15] x86_64: Avoid lazy relocation of tlsdesc [BZ #27137]
[12/15] i386: Avoid lazy relocation of tlsdesc [BZ #27137]
[13/15] x86_64: Remove lazy tlsdesc relocation related code
[14/15] i386: Remove lazy tlsdesc relocation related code
[15/15] elf: Remove lazy tlsdesc relocation related code=20

I backported them,but compile failed.
In file included from dynamic-link.h:92:0,
                 from dl-load.c:60:
../sysdeps/x86_64/dl-machine.h: In function =E2=80=98elf_machine_runtime_se=
tup=E2=80=99:
../sysdeps/x86_64/dl-machine.h:132:23: error: =E2=80=98_dl_tlsdesc_resolve_=
rela=E2=80=99
undeclared (first use in this function); did you mean =E2=80=98_dl_tlsdesc_=
return=E2=80=99?
       =3D (ElfW(Addr)) &_dl_tlsdesc_resolve_rela;
                       ^~~~~~~~~~~~~~~~~~~~~~~~
                       _dl_tlsdesc_return
../sysdeps/x86_64/dl-machine.h:132:23: note: each undeclared identifier is
reported only once for each function it appears in

--=20
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