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[$] Sharing page tables with mshare()
Tuesday May 17, 2022. 04:52 PM , from LWN.net
The Linux kernel allows processes to share pages in memory, but the page
tables used to control that sharing are not, themselves, shared; as a result, processes sharing memory maintain duplicate copies of the page-table data. Normally this duplication imposes little overhead, but there are situations where it can hurt. At the 2022 Linux Storage, Filesystem, Memory-management and BPF Summit (LSFMM), Khaled Aziz (remotely) and Matthew Wilcox led a session to discuss a proposed mechanism to allow those page tables to be shared between cooperating processes.
https://lwn.net/Articles/895217/
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