linux-kernel - [PATCH] mm/mmap.c: Remove redundant vma looping

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Message-ID: <COL130-W38E921DBAB9CFCFCC45F73B94A0@phx.gbl>
Date:	Sun, 4 Oct 2015 03:38:48 +0800
From:	Chen Gang <xili_gchen_5257@...mail.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
	"riel@...hat.com" <riel@...hat.com>, Michal Hocko <mhocko@...e.cz>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"asha.levin@...cle.com" <asha.levin@...cle.com>,
	"pfeiner@...gle.com" <pfeiner@...gle.com>,
	"aarcange@...hat.com" <aarcange@...hat.com>,
	"vishnu.ps@...sung.com" <vishnu.ps@...sung.com>,
	Linux Memory <linux-mm@...ck.org>,
	kernel mailing list <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/mmap.c: Remove redundant vma looping

>From 36dbcc145819655682f80efd49e72b01515b4e9a Mon Sep 17 00:00:00 2001
From: Chen Gang <gang.chen.5i5j@...il.com>
Date: Sun, 4 Oct 2015 03:22:41 +0800
Subject: [PATCH] mm/mmap.c: Remove redundant vma looping

vma->vm_file->f_mapping and vma->anon_vma are shared with the same vma
looping, so merge them.

Signed-off-by: Chen Gang <gang.chen.5i5j@...il.com>
---
 mm/mmap.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 8393580..f7c1631 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3201,9 +3201,7 @@ int mm_take_all_locks(struct mm_struct *mm)
 			goto out_unlock;
 		if (vma->vm_file && vma->vm_file->f_mapping)
 			vm_lock_mapping(mm, vma->vm_file->f_mapping);
-	}
 
-	for (vma = mm->mmap; vma; vma = vma->vm_next) {
 		if (signal_pending(current))
 			goto out_unlock;
 		if (vma->anon_vma)
-- 
1.9.3


Chen Gang

Open, share, and attitude like air, water, and life which God blessed
 		 	   		  
Download attachment "0001-mm-mmap.c-Remove-redundant-vma-looping.patch" of type "application/octet-stream" (836 bytes)