linux-kernel - [PATCH v3 01/16] mm/huge_memory: use flush_pmd_tlb_range in move_huge

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Date:   Mon, 4 Jul 2022 21:21:46 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <shy828301@...il.com>, <willy@...radead.org>, <zokeefe@...gle.com>,
        <songmuchun@...edance.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH v3 01/16] mm/huge_memory: use flush_pmd_tlb_range in move_huge_pmd

ARCHes with special requirements for evicting THP backing TLB entries can
implement flush_pmd_tlb_range. Otherwise also, it can help optimize TLB
flush in THP regime. Using flush_pmd_tlb_range to take advantage of this
in move_huge_pmd.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
Reviewed-by: Muchun Song <songmuchun@...edance.com>
Reviewed-by: Zach O'Keefe <zokeefe@...gle.com>
---
 mm/huge_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 0243105d0cc6..f4e581eefb67 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1850,7 +1850,7 @@ bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
 		pmd = move_soft_dirty_pmd(pmd);
 		set_pmd_at(mm, new_addr, new_pmd, pmd);
 		if (force_flush)
-			flush_tlb_range(vma, old_addr, old_addr + PMD_SIZE);
+			flush_pmd_tlb_range(vma, old_addr, old_addr + PMD_SIZE);
 		if (new_ptl != old_ptl)
 			spin_unlock(new_ptl);
 		spin_unlock(old_ptl);
-- 
2.23.0