linux-kernel - [PATCH] mm/memory-failure: allow memory allocation from emergency reserves

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Date: Tue, 25 Jun 2024 10:23:42 +0800
From: Rui Qi <qirui.001@...edance.com>
To: linmiaohe@...wei.com,
	nao.horiguchi@...il.com,
	akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Rui Qi <qirui.001@...edance.com>
Subject: [PATCH] mm/memory-failure: allow memory allocation from emergency reserves

From: Rui Qi <qirui.001@...edance.com>

we hope that memory errors can be successfully handled quickly, using
__GFP_MEMALLOC can help us improve the success rate of processing
under memory pressure, because to_kill struct is freed very quickly,
so using __GFP_MEMALLOC will not exacerbate memory pressure for a long time,
and  more memory will be freed after killed task exiting, which will also
reduce memory pressure.

Signed-off-by: Rui Qi <qirui.001@...edance.com>
---
 mm/memory-failure.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 05818d09b4eb..0608383f927a 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -451,7 +451,7 @@ static void __add_to_kill(struct task_struct *tsk, struct page *p,
 {
 	struct to_kill *tk;
 
-	tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC);
+	tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC | __GFP_MEMALLOC);
 	if (!tk) {
 		pr_err("Out of memory while machine check handling\n");
 		return;
@@ -1931,7 +1931,7 @@ static int folio_set_hugetlb_hwpoison(struct folio *folio, struct page *page)
 			return -EHWPOISON;
 	}
 
-	raw_hwp = kmalloc(sizeof(struct raw_hwp_page), GFP_ATOMIC);
+	raw_hwp = kmalloc(sizeof(struct raw_hwp_page), GFP_ATOMIC | __GFP_MEMALLOC);
 	if (raw_hwp) {
 		raw_hwp->page = page;
 		llist_add(&raw_hwp->node, head);
-- 
2.39.3 (Apple Git-145)