Bug 1429951
| Summary: | [rt] fs: dcache: Use cpu_chill() in trylock loops | ||||||
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| Product: | Red Hat Enterprise Linux 7 | Reporter: | Clark Williams <williams> | ||||
| Component: | kernel-rt | Assignee: | Clark Williams <williams> | ||||
| kernel-rt sub component: | Memory Management | QA Contact: | Jiri Kastner <jkastner> | ||||
| Status: | CLOSED ERRATA | Docs Contact: | |||||
| Severity: | medium | ||||||
| Priority: | medium | CC: | bhu, lgoncalv, williams | ||||
| Version: | 7.4 | ||||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2017-08-01 19:02:59 UTC | Type: | Bug | ||||
| 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: | 1353018, 1410158 | ||||||
| Attachments: |
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tested with scratch build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=12698074 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. https://access.redhat.com/errata/RHSA-2017:2077 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. https://access.redhat.com/errata/RHSA-2017:2077 |
Created attachment 1260846 [details] fs: dcache: Use cpu_chill() in trylock loops Retry loops on RT might loop forever when the modifying side was preempted. Use cpu_chill() instead of cpu_relax() to let the system make progress. Note: this is a partial port for RHEL, only touching the changes in fs/dcache.c. The other hunks of this patch (the s/cpu_relax/cpu_chill/) were applied earlier.