Zygo Blaxell a353d8cc6e hash: use POSIX_FADV_WILLNEED and POSIX_FADV_DONTNEED ...

The hash table is one of the few cases in bees where a non-trivial amount
of page cache memory will be used in a predictable way, so we can advise
the kernel about our IO demands in advance.

Use WILLNEED to prefetch hash table pages at startup.

Use DONTNEED to trigger writeback on hash table pages at shutdown.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

2021-10-04 20:41:09 -04:00

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