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* [Bug libc/28537] New: x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized
@ 2021-11-03 14:57 hjl.tools at gmail dot com
2022-01-25 18:11 ` [Bug libc/28537] " hjl.tools at gmail dot com
2022-01-26 6:42 ` sam at gentoo dot org
0 siblings, 2 replies; 3+ messages in thread
From: hjl.tools at gmail dot com @ 2021-11-03 14:57 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28537
Bug ID: 28537
Summary: x86: atomic_compare_and_exchange_[val|bool]_acq isn't
optimized
Product: glibc
Version: 2.34
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
CC: drepper.fsp at gmail dot com
Target Milestone: ---
Target: i386,x86-64
>From the CPU's point of view, getting a cache line for writing is more
expensive than reading. See Appendix A.2 Spinlock in:
https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/xeon-lock-scaling-analysis-paper.pdf
The full compare and swap will grab the cache line exclusive and causes
excessive cache line bouncing.
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* [Bug libc/28537] x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized
2021-11-03 14:57 [Bug libc/28537] New: x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized hjl.tools at gmail dot com
@ 2022-01-25 18:11 ` hjl.tools at gmail dot com
2022-01-26 6:42 ` sam at gentoo dot org
1 sibling, 0 replies; 3+ messages in thread
From: hjl.tools at gmail dot com @ 2022-01-25 18:11 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28537
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |skpgkp2 at gmail dot com
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* [Bug libc/28537] x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized
2021-11-03 14:57 [Bug libc/28537] New: x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized hjl.tools at gmail dot com
2022-01-25 18:11 ` [Bug libc/28537] " hjl.tools at gmail dot com
@ 2022-01-26 6:42 ` sam at gentoo dot org
1 sibling, 0 replies; 3+ messages in thread
From: sam at gentoo dot org @ 2022-01-26 6:42 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=28537
Sam James <sam at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |sam at gentoo dot org
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2021-11-03 14:57 [Bug libc/28537] New: x86: atomic_compare_and_exchange_[val|bool]_acq isn't optimized hjl.tools at gmail dot com
2022-01-25 18:11 ` [Bug libc/28537] " hjl.tools at gmail dot com
2022-01-26 6:42 ` sam at gentoo dot org
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