Bug 729090
| Summary: | mmapping a read only file on a gfs2 filesystem incorrectly acquires an exclusive glock | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Ken Reilly <kreilly> |
| Component: | kernel | Assignee: | Phillip Lougher <plougher> |
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | high | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 5.6 | CC: | adas, bmarzins, casmith, cww, dhoward, djansa, eguan, jwest, kzhang, mjuricek, pm-eus, qcai, rpeterso, scooter, swhiteho |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.18-238.24.1.el5 | Doc Type: | Bug Fix |
| Doc Text: |
Performance issues occurred when multiple nodes attempted to call mmap() on the same inode at the same time on a GFS2 file system, as it was using an exclusive glock. With this update, a shared lock is used when "noatime" is set on the mount, allowing mmap() operations to occur in parallel, fixing this bug. Note that this issue only refers to mmap() system calls, and not to subsequent page faults.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-09-20 17:51:33 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: | 672724 | ||
| Bug Blocks: | |||
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Comment 4
Steve Whitehouse
2011-08-08 18:17:24 UTC
*** Bug 729088 has been marked as a duplicate of this bug. *** in kernel-2.6.18-238.24.1.el5 linux-2.6-fs-gfs2-no-exclusive-glocks-on-mmapped-read-only-fs.patch 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-2011-1321.html
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New Contents:
Performance issues occurred when multiple nodes attempted to call mmap() on the same inode at the same time on a GFS2 file system, as it was using an exclusive glock. With this update, a shared lock is used when "noatime" is set on the mount, allowing mmap() operations to occur in parallel, fixing this bug. Note that this issue only refers to mmap() system calls, and not to subsequent page faults.
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