From 179f916e88e4a0fdd5ad4d20e226771d3d271c41 Mon Sep 17 00:00:00 2001 From: Anatoly Burakov Date: Mon, 11 Jun 2018 21:55:42 +0100 Subject: [PATCH] mem: allocate in reverse to reduce fragmentation Currently, all hugepages are allocated from lower VA address to higher VA address, while malloc heap allocates from higher VA address to lower VA address. This results in heap fragmentation over time due to multiple reserves leaving small space below the allocated elements. Fix this by allocating VA memory from the top, thereby reducing fragmentation and lowering overall memory usage. Signed-off-by: Anatoly Burakov --- lib/librte_eal/linuxapp/eal/eal_memalloc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c index 81c94d54e8..36278d9ee7 100644 --- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c +++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c @@ -703,7 +703,8 @@ alloc_seg_walk(const struct rte_memseg_list *msl, void *arg) need = wa->n_segs; /* try finding space in memseg list */ - cur_idx = rte_fbarray_find_next_n_free(&cur_msl->memseg_arr, 0, need); + cur_idx = rte_fbarray_find_prev_n_free(&cur_msl->memseg_arr, + cur_msl->memseg_arr.len - 1, need); if (cur_idx < 0) return 0; start_idx = cur_idx; -- 2.20.1