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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 07:31:51 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D19924

--- Comment #13 from ksong <cd_songkun at hotmail dot com> ---
Refer=20
https://sourceware.org/pipermail/libc-alpha/2021-February/122626.html
https://patchwork.ozlabs.org/project/glibc/list/?submitter=3D65667&page=3D4
Try backport patch form Szabolcs Nagy.
https://patchwork.ozlabs.org/project/glibc/patch/583EBBA0.9060709@arm.com/
https://patchwork.ozlabs.org/project/glibc/patch/583EBB99.8040101@arm.com/

Rebuild glibc.
Exec tls_mini test case.
[ctu-ksong-d1:tls]$LANG=3DC
/home/ksong/work/package/glibc/build/elf/ld-linux-x86-64.so.2 --library-path
/home/ksong/work/test/tls:/home/ksong/work/package/glibc/build:/home/ksong/=
work/package/glibc/build/math:/home/ksong/work/package/glibc/build/elf:/hom=
e/ksong/work/package/glibc/build/dlfcn:/home/ksong/work/package/glibc/build=
/nss:/home/ksong/work/package/glibc/build/nis:/home/ksong/work/package/glib=
c/build/rt:/home/ksong/work/package/glibc/build/resolv:/home/ksong/work/pac=
kage/glibc/build/crypt:/home/ksong/work/package/glibc/build/mathvec:/home/k=
song/work/package/glibc/build/nptl:/lib64
./tls_mini
time: 0.583575
time: 1.244377
time: 0.553654

It has some performance improvements, but not as obvious as the previous
solution.

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