| Bug ID | 909719 |
|---|---|
| Summary | bcache: livelock in btree lock |
| Classification | openSUSE |
| Product | openSUSE Distribution |
| Version | 13.2 |
| Hardware | Other |
| OS | Other |
| Status | NEW |
| Severity | Normal |
| Priority | P5 - None |
| Component | Kernel |
| Assignee | kernel-maintainers@forge.provo.novell.com |
| Reporter | jschmid@suse.com |
| QA Contact | qa-bugs@suse.de |
| Found By | --- |
| Blocker | --- |
This report is from upstream. This livelock might happen when we causes a huge number of cache misses simultaneously. This is a fix from upstream. This commit will try to take write btree->lock if it encounters a race when we traverse btree. Although it sacrifice the scalability but we can ensure that only one can modify the btree. Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>