From: yalin wang <yalin.wang2010@gmail.com>
To: akpm@linux-foundation.org, kirill.shutemov@linux.intel.com,
oleg@redhat.com, gang.chen.5i5j@gmail.com, mhocko@suse.com,
kwapulinski.piotr@gmail.com, aarcange@redhat.com,
dcashman@google.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Cc: yalin wang <yalin.wang2010@gmail.com>
Subject: [RFC] mm: change find_vma() function
Date: Mon, 14 Dec 2015 19:02:25 +0800 [thread overview]
Message-ID: <1450090945-4020-1-git-send-email-yalin.wang2010@gmail.com> (raw)
change find_vma() to break ealier when found the adderss
is not in any vma, don't need loop to search all vma.
Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
---
mm/mmap.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c
index b513f20..8294c9b 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2064,6 +2064,9 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
vma = tmp;
if (tmp->vm_start <= addr)
break;
+ if (!tmp->vm_prev || tmp->vm_prev->vm_end <= addr)
+ break;
+
rb_node = rb_node->rb_left;
} else
rb_node = rb_node->rb_right;
--
1.9.1
--
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next reply other threads:[~2015-12-14 11:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-14 11:02 yalin wang [this message]
2015-12-14 12:11 ` Kirill A. Shutemov
2015-12-14 17:55 ` Oleg Nesterov
2015-12-14 21:11 ` Kirill A. Shutemov
2015-12-15 6:41 ` yalin wang
2015-12-15 11:47 ` Andrea Arcangeli
2015-12-15 11:53 ` Kirill A. Shutemov
2015-12-22 5:31 ` yalin wang
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