linux-kernel - [RFC v11 09/14] mm: page_frag: use __alloc_pages() to replace alloc_pages

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Message-ID: <20240719093338.55117-10-linyunsheng@huawei.com>
Date: Fri, 19 Jul 2024 17:33:33 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Yunsheng Lin
	<linyunsheng@...wei.com>, Alexander Duyck <alexander.duyck@...il.com>, Andrew
 Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
Subject: [RFC v11 09/14] mm: page_frag: use __alloc_pages() to replace alloc_pages_node()

There are more new APIs calling __page_frag_cache_refill() in
this patchset, which may cause compiler not being able to inline
__page_frag_cache_refill() into __page_frag_alloc_va_align().

Not being able to do the inlining seems to casue some notiable
performance degradation in arm64 system with 64K PAGE_SIZE after
adding new API calling __page_frag_cache_refill().

It seems there is about 24Bytes binary size increase for
__page_frag_cache_refill() and __page_frag_cache_refill() 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 still part of the mm
system.

CC: Alexander Duyck <alexander.duyck@...il.com>
Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>
---
 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 d9c9cad17af7..3f162e9d23ba 100644
--- a/mm/page_frag_cache.c
+++ b/mm/page_frag_cache.c
@@ -59,11 +59,11 @@ 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)) {
 			memset(nc, 0, sizeof(*nc));
 			return NULL;
-- 
2.33.0