glibc/sysdeps/generic
Szabolcs Nagy d2123d6827 elf: Fix slow tls access after dlopen [BZ #19924]
In short: __tls_get_addr checks the global generation counter and if
the current dtv is older then _dl_update_slotinfo updates dtv up to the
generation of the accessed module. So if the global generation is newer
than generation of the module then __tls_get_addr keeps hitting the
slow dtv update path. The dtv update path includes a number of checks
to see if any update is needed and this already causes measurable tls
access slow down after dlopen.

It may be possible to detect up-to-date dtv faster.  But if there are
many modules loaded (> TLS_SLOTINFO_SURPLUS) then this requires at
least walking the slotinfo list.

This patch tries to update the dtv to the global generation instead, so
after a dlopen the tls access slow path is only hit once.  The modules
with larger generation than the accessed one were not necessarily
synchronized before, so additional synchronization is needed.

This patch uses acquire/release synchronization when accessing the
generation counter.

Note: in the x86_64 version of dl-tls.c the generation is only loaded
once, since relaxed mo is not faster than acquire mo load.

I have not benchmarked this. Tested by Adhemerval Zanella on aarch64,
powerpc, sparc, x86 who reported that it fixes the performance issue
of bug 19924.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
2023-09-01 08:21:37 +01:00
..
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c++-types.data
confstr.h
crti.S Introduce <elf-initfini.h> and ELF_INITFINI for all architectures 2020-02-18 15:12:25 +01:00
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ld.abilist
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ldconfig.h LoongArch: Add support for ldconfig. 2023-03-13 09:20:28 +08:00
ldsodefs.h elf: Fix slow tls access after dlopen [BZ #19924] 2023-09-01 08:21:37 +01:00
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link_map.h Initial support for GNU_PROPERTY_1_NEEDED 2021-10-07 10:26:08 -07:00
linkmap.h
local-setxid.h
localplt.data elf: Rework exception handling in the dynamic loader [BZ #25486] 2022-11-03 09:39:31 +01:00
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math-use-builtins-ceil.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-copysign.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fabs.h math: Add math-use-builtins-fabs (BZ#29027) 2022-05-23 17:49:18 -03:00
math-use-builtins-floor.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fma.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
math-use-builtins-fmax.h math: Add math-use-builtinds-fmax.h 2021-12-13 09:08:07 -03:00
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math-use-builtins-llrint.h Use GCC builtins for llrint functions if desired. 2022-11-29 16:00:28 +08:00
math-use-builtins-logb.h Use GCC builtins for logb functions if desired. 2022-11-29 16:00:28 +08:00
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math-use-builtins-nearbyint.h math: Decompose math-use-builtins.h 2020-06-22 11:09:45 -03:00
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math-use-builtins-roundeven.h Use GCC builtins for roundeven functions if desired. 2021-06-27 07:56:57 -07:00
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memcopy.h Parameterize OP_T_THRES from memcopy.h 2023-02-06 16:19:35 -03:00
mmap_info.h posix: Fix large mmap64 offset for mips64n32 (BZ#24699) 2019-07-10 16:52:50 -03:00
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string-fza.h Add string vectorized find and detection functions 2023-02-06 16:19:35 -03:00
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string-fzc.h Add string vectorized find and detection functions 2023-02-06 16:19:35 -03:00
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string-misc.h Add string vectorized find and detection functions 2023-02-06 16:19:35 -03:00
string-opthr.h Parameterize OP_T_THRES from memcopy.h 2023-02-06 16:19:35 -03:00
string-optype.h Parameterize op_t from memcopy.h 2023-02-06 16:19:35 -03:00
string-shift.h Add string vectorized find and detection functions 2023-02-06 16:19:35 -03:00
struct_stat_time64.h linux: Add {f}stat{at} y2038 support 2020-10-09 17:02:07 -03:00
symbol-hacks.h Disable symbol hack in libc_nonshared.a 2021-09-27 07:46:25 -07:00
sysdep-cancel.h nptl: Remove tst-cancel-wrappers test and related macros 2019-01-03 18:38:08 -02:00
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unsecvars.h Remove --enable-tunables configure option 2023-03-29 14:33:06 -03:00
unwind-arch.h Update copyright dates with scripts/update-copyrights 2023-01-06 21:14:39 +00:00
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