linux-kernel - [RFC PATCH 3/6] perf: change the condition of identifying hugetlb vm

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Date:	Wed, 10 Jun 2015 14:27:16 +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 3/6] perf: 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>
---
 kernel/events/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index f04daab..6313bdd 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5624,7 +5624,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
 			flags |= MAP_EXECUTABLE;
 		if (vma->vm_flags & VM_LOCKED)
 			flags |= MAP_LOCKED;
-		if (vma->vm_flags & VM_HUGETLB)
+		if ((vma->vm_flags & (VM_HUGETLB | VM_MERGEABLE)) == VM_HUGETLB)
 			flags |= MAP_HUGETLB;
 
 		goto got_name;
-- 
1.7.9.5

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