Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
1. Feature Overview:
Feature Id: [74747]
a. Name of Feature: binutils TOC and PLT optimizations
b. Feature Description
binutils TOC and PLT optimizations: Linker changes to improve performance of TOC addressability and PLT call stubs.
This is follow-on work to the Large-TOC changes made in the previous release. These changes allow us to improve the performance of some TOC accesses when the compiler/linker can determine a better sequence of instructions can be used. We also improve the sequence of instructions in the PLT call stubs to improve performance under certain circumstances.
2. Feature Details:
Sponsor: LTC Toolchain
Architectures: ppc64,
Arch Specificity: both
Affects Kernel Modules: No
Delivery Mechanism: Backport
Category: other
Request Type: Package - Feature from Upstream
d. Upstream Acceptance: In Progress
Sponsor Priority P2
f. Severity: high
IBM Confidential: No
Code Contribution: IBM code
g. Component Version Target: ---
3. Business Case
Recent reports of large programs (SAP, doxygen) failing during compile/link due to TOC overflow. Also, some applications experience performance degrading with the current multi-TOC support. This feature simplifies the build process while improving performance.
4. Primary contact at Red Hat:
John Jarvis, jjarvis
5. Primary contacts at Partner:
Project Management Contact:
Michael L. Hohnbaum, hbaum.com
Technical contact(s):
Peter E. Bergner, bergner.com
Created attachment 552249[details]
rhel6 powerpc binutils patchset
------- Comment on attachment From amodra.com 2012-01-11 17:27 EDT-------
Patches related to toc/plt optimization plus a few others.
May I have an update on this please? We are now mid-way in the Development cycle and I'd like to know if we are still targeting to include this for RHEL 6.3.
------- Comment From hohnbaum.com 2012-02-15 11:03 EDT-------
Patches are attached to this bugzilla - were attached Jan 11. Code is accepted upstream.
What additional information do you need?
Created attachment 564945[details]
Tarball containing patches packaged in a suitable way to apply to the RHEL 6.3 binutils srpm
The tarball contains the patches supplied by IBM integrated into a single, large patchfile, plus an update to binutils.spec to include the patch in a binutils build.
This enhancement request was evaluated by the full Red Hat Enterprise Linux
team for inclusion in a Red Hat Enterprise Linux minor release. As a result
of this evaluation, Red Hat has tentatively approved inclusion of this feature
in the next Red Hat Enterprise Linux Update minor release. While it is a goal
to include this enhancement in the next minor release of Red Hat Enterprise
Linux, the enhancement is not yet committed for inclusion in the next minor
release pending the next phase of actual code integration and successful Red
Hat and partner testing.
Created attachment 580466[details]
replacement binutils-rh739144,patch
Nick, in looking over binutils-2.20.51.0.2-5.32.el6.src.rpm I noticed that a hunk is missing from binutils-rh739144.patch near the start of elf64-ppc.c:ppc64_elf_tls_optimize, probably due to a patch reject. Attached please find a replacement.
(In reply to comment #15)
> Created attachment 580466[details]
> replacement binutils-rh739144,patch
>
> Nick, in looking over binutils-2.20.51.0.2-5.32.el6.src.rpm I noticed that a
> hunk is missing from binutils-rh739144.patch near the start of
> elf64-ppc.c:ppc64_elf_tls_optimize, probably due to a patch reject. Attached
> please find a replacement.
Please note that this patch is missing testsuite updates.
------- Comment From amodra.com 2012-05-15 04:59 EDT-------
Michal, I saw your note last week and have been waiting for the source rpm to appear on ftp3.linux.ibm.com. It's still not there. Can I access the rpm somewhere else?
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, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2012-0872.html