Zygo Blaxell de6282c6cd roots: separate crawl sizes into bytes and items ...

Number of items should be low enough that we don't have too many stale
items, but high enough to amortize system call overhead to a reasonable
ratio.

Number of bytes should be constant:  one worst-case metadata page (the
btrfs limit is 64K, though 16K is much more common) so that we always
have enough space for one worst-case item; otherwise, we get EOVERFLOW
if we set the number of items too low and there's a big item in the tree,
and we can't make further progress.

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

2020-12-17 17:54:51 -05:00

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