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mimic: core: os/bluestore: cache autotuning and memory limit #25283
This is a mimic backport of:
These make bluestore much simpler to configure, since users no longer need to worry about bluestore's cache size or internal details of what is allocated where.
Instead, the osd_memory_target tunable is all that is needed. Since bluestore cannot use the kernel's page cache, the default osd memory target is 4GB. This has no effect on filestore.