Linux 7.4’s slab allocator refills its sheaves from the barn and gains 24% in memory allocation

An 81-line patch by Hao Li, queued into slab/for-next ahead of the Linux 7.4 merge window, lets the slab allocator refill its sheaves from the barn instead of partial slabs, clearing a saturation that penalized kfree_rcu(). The measured result: +24% on the will-it-scale mmap1 test and massive gains on the barn microbenchmarks.