Numerous "MM" Improvements Land In Linux 5.19
As usual, the "mm" changes collected by Morton span a wide range of work. For Linux 5.19 some of the highlights from this pull include:
- Memcg accounting for Zswap. Currently applications can escape their cgroup memory containment when Zswap is enabled. But now with Linux 5.19 is per-cgroup tracking and limiting of Zswap back-end memory to address this prior oversight.
- Improvements to the SWAP over NFS handling and more broadly various swap-via-file-system enhancements.
- DAMON as the Data Access Monitoring framework developed by Amazon there is now support for online tuning. Up to now configuring DAMON via sysfs hasn't provided a way to adjust the DAMON input parameters while running and thus required stopping/starting DAMON. In turn the DAMON restarts flushes all of the accumulated monitoring results so instead there is now support for online updating of inputs via sysfs.
- Adding the "hugetlb_optimize_vmemmap" sysctl know for online/run-time enabling/toggling of the huge page vmemmap optimization. Thus cuts down on possible downtime for rebooting the server to enabling this memory optimization or for selectively toggling hugetlb_optimize_vmemmap during run-time depending upon the workloads/applications.
This pull request goes over all of the other Linux 5.19 memory management related changes so far for this first week of the merge window.