Bug 2085529 - glibc: Restartable sequences interfaces and sched_getcpu accelerated by default
Summary: glibc: Restartable sequences interfaces and sched_getcpu accelerated by default
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: glibc
Version: 9.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Florian Weimer
QA Contact: Sergey Kolosov
Dominik
URL:
Whiteboard:
Depends On: 2033446
Blocks: 2105220 2115828
TreeView+ depends on / blocked
 
Reported: 2022-05-13 15:25 UTC by Florian Weimer
Modified: 2023-07-18 14:29 UTC (History)
9 users (show)

Fixed In Version: glibc-2.34-37.el9
Doc Type: Enhancement
Doc Text:
.Applications can use the restartable sequence features through the new `glibc` interfaces To accelerate the `sched_getcpu` function (especially on aarch64), it is necessary to use the restartable sequences (rseq) kernel feature by default in `glibc`. To allow applications to continuously use the shared rseq area, `glibc` now provides the `pass:[__rseq_offset]`, `pass:[__rseq_size]` and `pass:[__rseq_flags]` symbols which were first added in `glibc` 2.35 upstream version. With this enhancement, the performance of the `sched_getcpu` function is increased and applications can now use the restartable sequence features through the new `glibc` interfaces.
Clone Of:
: 2115828 (view as bug list)
Environment:
Last Closed: 2022-11-15 11:11:50 UTC
Type: Enhancement
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 2024347 1 unspecified CLOSED glibc: Optional sched_getcpu acceleration using rseq 2023-07-18 14:29:19 UTC
Red Hat Issue Tracker OSCI-3342 0 None None None 2022-06-07 08:54:09 UTC
Red Hat Issue Tracker RHELPLAN-122003 0 None Waiting on Customer IP not assigned to nodes as Client ID generated to fetch IP from DNSMASQ server is not always ll-mac 2022-06-09 09:37:33 UTC
Red Hat Product Errata RHBA-2022:8272 0 None None None 2022-11-15 11:12:26 UTC

Description Florian Weimer 2022-05-13 15:25:44 UTC 
Once criu supports rseq (bug 2033446), we can enable its use by default in glibc, following partial enablement in bug 2024347.

We should consider ways to simplify integration of third-party rseq-using components such as tcmalloc. The most straightforward way to achieve that could involve backporting the GLIBC_2.35 ld.so symbols (which constitutes the entire GLIBC_2.35 symbol set for ld.so).
Comment 14 errata-xmlrpc 2022-11-15 11:11:50 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 (glibc 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/RHBA-2022:8272
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