linux-kernel - [RFC PATCH 5/7] mm: try use fast path for pmd setting as well

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Date:   Fri, 29 Jul 2022 04:45:09 +0800
From:   Kairui Song <ryncsn@...il.com>
To:     linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kairui Song <kasong@...cent.com>
Subject: [RFC PATCH 5/7] mm: try use fast path for pmd setting as well

From: Kairui Song <kasong@...cent.com>

Use the per-CPU RSS cache helper as much as possible.

Signed-off-by: Kairui Song <kasong@...cent.com>
---
 mm/memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index f00f302143b6..09d7d193da51 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4419,7 +4419,7 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
 	if (write)
 		entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma);
 
-	add_mm_counter(vma->vm_mm, mm_counter_file(page), HPAGE_PMD_NR);
+	add_mm_counter_fast(vma->vm_mm, mm_counter_file(page), HPAGE_PMD_NR);
 	page_add_file_rmap(page, vma, true);
 
 	/*
-- 
2.35.2