From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932117Ab2AMLqe (ORCPT ); Fri, 13 Jan 2012 06:46:34 -0500 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:34494 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932068Ab2AMLqd (ORCPT ); Fri, 13 Jan 2012 06:46:33 -0500 Message-ID: <4F101904.8090405@linux.vnet.ibm.com> Date: Fri, 13 Jan 2012 19:44:04 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0 MIME-Version: 1.0 To: Andrew Morton CC: William Irwin , linux-mm@kvack.org, LKML Subject: [PATCH 1/5] hugetlbfs: fix hugetlb_get_unmapped_area Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12011301-9264-0000-0000-0000009D251C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Using/updating cached_hole_size and free_area_cache properly to speedup find free region Signed-off-by: Xiao Guangrong --- fs/hugetlbfs/inode.c | 15 +++++++++++---- 1 files changed, 11 insertions(+), 4 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index e425ad9..9e0794a 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -154,10 +154,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr, return addr; } - start_addr = mm->free_area_cache; - - if (len <= mm->cached_hole_size) + if (len > mm->cached_hole_size) + start_addr = mm->free_area_cache; + else { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; + } full_search: addr = ALIGN(start_addr, huge_page_size(h)); @@ -171,13 +173,18 @@ full_search: */ if (start_addr != TASK_UNMAPPED_BASE) { start_addr = TASK_UNMAPPED_BASE; + mm->cached_hole_size = 0; goto full_search; } return -ENOMEM; } - if (!vma || addr + len <= vma->vm_start) + if (!vma || addr + len <= vma->vm_start) { + mm->free_area_cache = addr + len; return addr; + } + if (addr + mm->cached_hole_size < vma->vm_start) + mm->cached_hole_size = vma->vm_start - addr; addr = ALIGN(vma->vm_end, huge_page_size(h)); } } -- 1.7.7.5