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Bug 1856398 - glibc: Build with -moutline-atomics on aarch64
Summary: glibc: Build with -moutline-atomics on aarch64
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: glibc
Version: 8.4
Hardware: aarch64
OS: Linux
high
high
Target Milestone: rc
: 8.4
Assignee: DJ Delorie
QA Contact: Sergey Kolosov
URL:
Whiteboard:
: 1818100 1828473 (view as bug list)
Depends On: 1821994 1828472
Blocks: 1809132 1877113 1894575
TreeView+ depends on / blocked
 
Reported: 2020-07-13 14:17 UTC by Florian Weimer
Modified: 2023-07-18 14:30 UTC (History)
14 users (show)

Fixed In Version: glibc-2.28-136.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-05-18 14:36:34 UTC
Type: Enhancement
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
moutline-atomics.patch (932 bytes, patch)
2020-07-20 16:18 UTC, Florian Weimer
no flags Details | Diff

Description Florian Weimer 2020-07-13 14:17:26 UTC
We should build glibc with -moutline-atomics on aarch64, to avoid a critical performance regression in the mutex implementation on certain CPUs.

This depends on a GCC change. After that, it is just a three-line glibc.spec change.

Comment 1 Florian Weimer 2020-07-14 17:11:46 UTC
*** Bug 1818100 has been marked as a duplicate of this bug. ***

Comment 2 Florian Weimer 2020-07-14 17:12:02 UTC
*** Bug 1828473 has been marked as a duplicate of this bug. ***

Comment 3 Florian Weimer 2020-07-20 16:18:39 UTC
Created attachment 1701786 [details]
moutline-atomics.patch

Marek provided me with a test build of GCC, and I was able to build glibc with it, using the attached patch. The resulting glibc builds on a system with LSE atomics and selects the expected code path, including in the dynamic loader (so its ELF constructor was executed).

Once we know the GCC version with the patch, we should probably tighten the gcc build dependency as well.

Comment 4 Jeremy Linton (ARM) 2020-07-27 21:27:49 UTC
I found this right before opening a defect requesting much the same thing so +one... :)

Comment 16 errata-xmlrpc 2021-05-18 14:36:34 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: glibc security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:1585


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