On Mon, Aug 26, 2024 at 5:46 AM Yunsheng Lin <linyunsheng@xxxxxxxxxx> wrote:
>
> It seems there is about 24Bytes binary size increase for
> __page_frag_cache_refill() after refactoring in arm64 system
> with 64K PAGE_SIZE. By doing the gdb disassembling, It seems
> we can have more than 100Bytes decrease for the binary size
> by using __alloc_pages() to replace alloc_pages_node(), as
> there seems to be some unnecessary checking for nid being
> NUMA_NO_NODE, especially when page_frag is part of the mm
> system.
>
> CC: Alexander Duyck <alexander.duyck@xxxxxxxxx>
> Signed-off-by: Yunsheng Lin <linyunsheng@xxxxxxxxxx>
> ---
> mm/page_frag_cache.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/page_frag_cache.c b/mm/page_frag_cache.c
> index bba59c87d478..e0ad3de11249 100644
> --- a/mm/page_frag_cache.c
> +++ b/mm/page_frag_cache.c
> @@ -28,11 +28,11 @@ static struct page *__page_frag_cache_refill(struct page_frag_cache *nc,
> #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)
> gfp_mask = (gfp_mask & ~__GFP_DIRECT_RECLAIM) | __GFP_COMP |
> __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC;
> - page = alloc_pages_node(NUMA_NO_NODE, gfp_mask,
> - PAGE_FRAG_CACHE_MAX_ORDER);
> + page = __alloc_pages(gfp_mask, PAGE_FRAG_CACHE_MAX_ORDER,
> + numa_mem_id(), NULL);
> #endif
> if (unlikely(!page)) {
> - page = alloc_pages_node(NUMA_NO_NODE, gfp, 0);
> + page = __alloc_pages(gfp, 0, numa_mem_id(), NULL);
> if (unlikely(!page)) {
> nc->encoded_page = 0;
> return NULL;
I still think this would be better served by fixing alloc_pages_node
to drop the superfluous checks rather than changing the function. We
would get more gain by just addressing the builtin constant and
NUMA_NO_NODE case there.
