linux-kernel - [RFC PATCH 5/6] x86/mm: change the condition of identifying hugetlb vm

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Date:	Wed, 10 Jun 2015 14:27:18 +0800
From:	Wenwei Tao <wenweitaowenwei@...il.com>
To:	izik.eidus@...ellosystems.com, aarcange@...hat.com,
	chrisw@...s-sol.org, hughd@...gle.com, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, x86@...nel.org,
	viro@...iv.linux.org.uk
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	kvm@...r.kernel.org, kvm-ppc@...r.kernel.org,
	wenweitaowenwei@...il.com
Subject: [RFC PATCH 5/6] x86/mm: change the condition of identifying hugetlb vm

Hugetlb VMAs are not mergeable, that means a VMA couldn't have VM_HUGETLB and
VM_MERGEABLE been set in the same time. So we use VM_HUGETLB to indicate new
mergeable VMAs. Because of that a VMA which has VM_HUGETLB been set is a hugetlb
VMA only if it doesn't have VM_MERGEABLE been set in the same time.

Signed-off-by: Wenwei Tao <wenweitaowenwei@...il.com>
---
 arch/x86/mm/tlb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 3250f23..0247916 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -195,7 +195,8 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 		goto out;
 	}
 
-	if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
+	if ((end != TLB_FLUSH_ALL) &&
+		!((vmflag & (VM_HUGETLB | VM_MERGEABLE)) == VM_HUGETLB))
 		base_pages_to_flush = (end - start) >> PAGE_SHIFT;
 
 	if (base_pages_to_flush > tlb_single_page_flush_ceiling) {
-- 
1.7.9.5

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