From: Keith Busch <kbusch@xxxxxxxxxx> Allocating and freeing blocks from the dmapool iterates a list of all allocated pages. We can save time removing the per-alloc/free list traversal for a constant time lookup, so this series does that. Compared to current kernel, perf record from running io_uring benchmarks on nvme reports dma_pool_alloc() cost reduction cut in half from 0.81% to 0.41%. Keith Busch (2): mm/dmapool: replace linked list with xarray mm/dmapool: link blocks across pages mm/dmapool.c | 107 +++++++++++++++++++++++++++------------------------ 1 file changed, 56 insertions(+), 51 deletions(-) -- 2.30.2
