| Summary: | pending THP improvements for RHEL6.2 | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Andrea Arcangeli <aarcange> | ||||||||
| Component: | kernel | Assignee: | Andrea Arcangeli <aarcange> | ||||||||
| Status: | CLOSED ERRATA | QA Contact: | Caspar Zhang <czhang> | ||||||||
| Severity: | low | Docs Contact: | |||||||||
| Priority: | medium | ||||||||||
| Version: | 6.2 | CC: | arozansk, chaowang, czhang, qcai | ||||||||
| Target Milestone: | rc | ||||||||||
| Target Release: | --- | ||||||||||
| Hardware: | All | ||||||||||
| OS: | Linux | ||||||||||
| Whiteboard: | |||||||||||
| Fixed In Version: | kernel-2.6.32-156.el6 | Doc Type: | Bug Fix | ||||||||
| Doc Text: |
In Red Hat Enterprise Linux 6.2, Transparent Huge Pages are now supported in several places of the kernel:
The system calls of mremap, mincore, and mprotect
/proc tunable parameters: /proc/<pid>/smaps and /proc/vmstat
Additionally, Transparent Huge Pages add some compaction improvements.
|
Story Points: | --- | ||||||||
| Clone Of: | Environment: | ||||||||||
| Last Closed: | 2011-12-06 13:32:17 UTC | Type: | --- | ||||||||
| Regression: | --- | Mount Type: | --- | ||||||||
| Documentation: | --- | CRM: | |||||||||
| Verified Versions: | Category: | --- | |||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||
| Attachments: |
|
||||||||||
|
Description
Andrea Arcangeli
2011-05-20 10:56:30 UTC
Build with these patches based on -151: https://brewweb.devel.redhat.com/taskinfo?taskID=3339439 19 patches posted to rhkernel-list on the thread with Message-Id: <20110520110640.655593797>. *** Bug 679997 has been marked as a duplicate of this bug. *** Patch number 2/19 has been obsoleted for an (harmless) double accounting in /proc/vmstat and new replacement patch 2/19 is submitted to rhkernel-list with Message-ID: <20110526172833.GP19505> A replacement patch for 15/19 has been posted to rhkernel-list with Message-ID: <20110526220056.GR19505>. Patch 15/19 was developed before 29 Mar, but after that date the RHEL6 kernel uses walk_page_range in memcontrol.c too so it now requires two liner additions to the the memcontrol.c file compared to the previous version originally backported to an older codebase. Thanks to Johannes for noticing. This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. Posted an incremental patch to fix bug in patch 11/19: Message-ID: <20110706152029.GD2820> Patch(es) available on kernel-2.6.32-177.el6 Patch(es) available on kernel-2.6.32-156.el6
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:
In RHEL6.2, Transparent Hugepages adds natively supported in
several places of the kernel such as to the syscalls of mremap, mincore, mprotect; /proc tunable paremeters: /proc/<pid>/smaps, /proc/vmstat, and adds some compaction improvement
Created attachment 531100 [details]
mincore.c
simple test program to check mincore thp support
Created attachment 531101 [details]
mprotect.c
Created attachment 531102 [details]
mremap.c
Technical note updated. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
Diffed Contents:
@@ -1,2 +1,6 @@
-In RHEL6.2, Transparent Hugepages adds natively supported in
+In Red Hat Enterprise Linux 6.2, Transparent Huge Pages are now supported in several places of the kernel:
-several places of the kernel such as to the syscalls of mremap, mincore, mprotect; /proc tunable paremeters: /proc/<pid>/smaps, /proc/vmstat, and adds some compaction improvement+
+ The system calls of mremap, mincore, and mprotect
+ /proc tunable parameters: /proc/<pid>/smaps and /proc/vmstat
+
+Additionally, Transparent Huge Pages add some compaction improvements.
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/RHSA-2011-1530.html |