4be4fd5d5f
additional allocation overhead. Previously, blst_meta_alloc() updated the hint after every successful allocation. However, these "eager" hint updates are of no actual benefit if, instead, the "lazy" hint update at the start of blst_meta_alloc() is generalized to handle all cases where the number of available blocks is less than the requested allocation. Previously, the lazy hint update at the start of blst_meta_alloc() only handled the ALL-FULL case. (I would also note that this change provides consistency between blist_alloc() and blist_fill() in that their hint maintenance is now entirely lazy.) Eliminate unnecessary checks for terminators in blst_meta_alloc() and blst_meta_fill() when handling ALL-FREE meta nodes. Eliminate the field "bl_free" from struct blist. It is redundant. Unless the entire radix tree is a single leaf, the count of free blocks is stored in the root node. Instead, provide a function blist_avail() for obtaining the number of free blocks. In blst_meta_alloc(), perform a sanity check on the allocation once rather than repeating it in a loop over the meta node's children. In blst_leaf_fill(), use the optimized bitcount*() function instead of a loop to count the blocks being allocated. Add or improve several comments. Address some nearby style errors. Reviewed by: kib MFC after: 6 weeks Differential Revision: https://reviews.freebsd.org/D11146
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