Bug 795896
| Summary: | [RFE] [RHEL 5.9 FEAT] Kernel VDSO support - glibc part | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | IBM Bug Proxy <bugproxy> | ||||
| Component: | glibc | Assignee: | Jeff Law <law> | ||||
| Status: | CLOSED ERRATA | QA Contact: | qe-baseos-tools-bugs | ||||
| Severity: | high | Docs Contact: | |||||
| Priority: | high | ||||||
| Version: | 5.9 | CC: | bgollahe, fweimer, jjarvis, mfranc, nobody+PNT0273897, pfrankli, sbest | ||||
| Target Milestone: | beta | Keywords: | FutureFeature, OtherQA | ||||
| Target Release: | 5.9 | ||||||
| Hardware: | s390x | ||||||
| OS: | All | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | Enhancement | |||||
| Doc Text: |
A Virtual Dynamic Shared Object (VDSO) allows an application in user space to perform some kernel actions without as much overhead as a system call. The VDSO is often used to provide fast access to the gettimeofday system call data. Support for VDSOs on the IBM Z series platform has been added to glibc.
|
Story Points: | --- | ||||
| Clone Of: | |||||||
| : | 818358 (view as bug list) | Environment: | |||||
| Last Closed: | 2013-01-08 03:46:08 UTC | Type: | --- | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Bug Depends On: | |||||||
| Bug Blocks: | 783140, 785210, 795895, 803564 | ||||||
| Attachments: |
|
||||||
|
Description
IBM Bug Proxy
2012-02-21 18:40:36 UTC
------- Comment From mgrf.com 2012-02-22 04:57 EDT------- This feature has a related/required request for the kernel 78992 ??-??RHBZ 795895 [5.9 FEAT] Kernel VDSO support IBM is signed up to test and provide feedback, setting OtherQA.
Given this is s390, I would be a lot more comfortable if IBM could step up and identify what, if anything, beyond these two patches is necessary from the glibc side:
commit 19df733e643ea2a0ea95385957163d0e3d5b2d1c
Author: Andreas Krebbel <Andreas.Krebbel.com>
Date: Tue Jul 19 20:29:27 2011 -0400
S/390: Don't use r11 in INTERNAL_VSYSCALL_NCS macro
commit 0480c901736591179cdf675697df7ea476720b90
Author: Ulrich Drepper <drepper>
Date: Thu Jan 8 00:28:23 2009 +0000
* sysdeps/unix/sysv/linux/s390/bits/libc-vdso.h: New file.
* sysdeps/unix/sysv/linux/s390/gettimeofday.c: New file.
* sysdeps/unix/sysv/linux/s390/init-first.c: New file.
* sysdeps/unix/sysv/linux/s390/Makefile (sysdep_routines): Add dl-vdso
for elf subdir.
* sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h (INLINE_VSYSCALL,
INTERNAL_VSYSCALL, INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK,
INTERNAL_SYSCALL_NCS, HAVE_CLOCK_GETRES_VSYSCALL and
HAVE_CLOCK_GETTIME_VSYSCALL: Define.
* sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h: Likewise.
* sysdeps/unix/sysv/linux/s390/Versions: New file.
78992 ?-?RHBZ 795895 [5.9 FEAT] Kernel VDSO support Created attachment 580461 [details]
glibc-s390-vdso.patch
------- Comment (attachment only) From brueckner.com 2012-04-26 12:37 EDT-------
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. ------- Comment From mgrf.com 2012-06-11 10:16 EDT------- For the record: The code for this feature passed testing on a special RHEL 5.9 build plus the feature code
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
New Contents:
A Virtual Dynamic Shared Object (VDSO) allows an application in user space to perform some kernel actions without as much overhead as a system call. The VDSO is often used to provide fast access to the gettimeofday system call data. Support for VDSOs on the IBM Z series platform has been added to glibc.
------- Comment From mgrf.com 2012-10-18 06:07 EDT------- This feature is verified on R 5.9 snapshots - set to verified on IBM site 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-2013-0022.html |