performance: address_space: add padding for i_map and i_mmap_rwsem to mitigate a false sharing
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Invalid
|
Undecided
|
Philip Cox | ||
Jammy |
Fix Released
|
Medium
|
Philip Cox |
Bug Description
This is a public version of https:/
[Description]
When running UnixBench/
The patch places the i_mmap and i_mmap_rwsem in separate cache lines to avoid this false sharing problem.
[Hardware Information]
Architecture:
Intel / AMD (x86_64)
Platform(s):
DNP
Date HW is expected at Canonical:
Component(s):
Performance and Scalability
[Software Information]
Target Version:
23.10
Target Kernel:
TBD
Commit IDs:
aee79d4e5271 fs/address_space: add alignment padding for i_map and i_mmap_rwsem to mitigate a false sharing.
External Links:
[Business Justification]
[Testing guidance]
[External ID]
OSVE-5159
Here's the commit ID: aee79d4e5271cee
https:/
CVE References
Changed in linux (Ubuntu Jammy): | |
assignee: | nobody → Philip Cox (philcox) |
Changed in linux (Ubuntu): | |
status: | New → In Progress |
Changed in linux (Ubuntu Jammy): | |
status: | New → In Progress |
Changed in linux (Ubuntu Jammy): | |
importance: | Undecided → Medium |
Changed in linux (Ubuntu): | |
status: | In Progress → Invalid |
Changed in linux (Ubuntu Jammy): | |
status: | In Progress → Fix Committed |
tags: |
added: verification-passed-focal-linux-aws-5.15 verification-passed-jammy-linux verification-passed-jammy-linux-aws-fips removed: verification-needed-focal-linux-aws-5.15 verification-needed-jammy-linux verification-needed-jammy-linux-aws-fips |
tags: |
added: verification-done-focal-linux-aws-5.15 verification-done-focal-linux-nvidia-tegra-5.15 verification-done-jammy-linux verification-done-jammy-linux-aws-fips verification-done-jammy-linux-nvidia-tegra removed: verification-needed-focal-linux-nvidia-tegra-5.15 verification-needed-jammy-linux-nvidia-tegra verification-passed-focal-linux-aws-5.15 verification-passed-jammy-linux verification-passed-jammy-linux-aws-fips |
This bug is awaiting verification that the linux/5. 15.0-102. 112 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification- needed- jammy-linux' to 'verification- done-jammy- linux'. If the problem still exists, change the tag 'verification- needed- jammy-linux' to 'verification- failed- jammy-linux' .
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.
See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation how to enable and use -proposed. Thank you!