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Message-ID: <20231103140119.2306578-10-wangkefeng.wang@huawei.com>
Date: Fri, 3 Nov 2023 22:01:10 +0800
From: Kefeng Wang <wangkefeng.wang@...wei.com>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
Matthew Wilcox <willy@...radead.org>,
David Hildenbrand <david@...hat.com>,
<linux-s390@...r.kernel.org>,
Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH 09/18] mm: memory: use a folio in do_set_pmd()
Use a folio in do_set_pmd(), which save one compound_head() call.
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
mm/memory.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index 1f18ed4a5497..09009094a5f2 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4313,12 +4313,13 @@ vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
unsigned long haddr = vmf->address & HPAGE_PMD_MASK;
pmd_t entry;
vm_fault_t ret = VM_FAULT_FALLBACK;
+ struct folio *folio;
if (!transhuge_vma_suitable(vma, haddr))
return ret;
- page = compound_head(page);
- if (compound_order(page) != HPAGE_PMD_ORDER)
+ folio = page_folio(page);
+ if (folio_order(folio) != HPAGE_PMD_ORDER)
return ret;
/*
@@ -4350,7 +4351,7 @@ 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(vma->vm_mm, mm_counter_file_folio(folio), HPAGE_PMD_NR);
page_add_file_rmap(page, vma, true);
/*
--
2.27.0
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