Speakers
Description
The main issue of mmap_lock is its process-wide scale, which prevents handling page faults in one virtual memory area (VMA) of a process when another VMA of the same process is being modified.
The maple tree has been simplifying the way VMAs are stored to avoid multiple updates to the 3 data structures used to keep track of the VMAs.
Latest respin of Speculative Page Faults patchset (https://lwn.net/ml/linux-mm/20220128131006.67712-1-michel@lespinasse.org/) was deemed too complex to be accepted and the discussion concluded with a suggestion that "a reader/writer semaphore could be put into the VMA as a sort of range lock". Per-VMA lock patchset implements this approach.
This talk will cover maple tree and per-VMA lock patchsets as well as the future of Speculative Page Faults patchset and new mmap_lock contention findings.
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