From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail137.messagelabs.com (mail137.messagelabs.com [216.82.249.19]) by kanga.kvack.org (Postfix) with ESMTP id 08FA16B0012 for ; Wed, 25 May 2011 03:09:53 -0400 (EDT) Received: from m3.gw.fujitsu.co.jp (unknown [10.0.50.73]) by fgwmail6.fujitsu.co.jp (Postfix) with ESMTP id 8EA743EE0AE for ; Wed, 25 May 2011 16:09:50 +0900 (JST) Received: from smail (m3 [127.0.0.1]) by outgoing.m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 75A9E45DF47 for ; Wed, 25 May 2011 16:09:50 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (s3.gw.fujitsu.co.jp [10.0.50.93]) by m3.gw.fujitsu.co.jp (Postfix) with ESMTP id 5408645DEDE for ; Wed, 25 May 2011 16:09:50 +0900 (JST) Received: from s3.gw.fujitsu.co.jp (localhost.localdomain [127.0.0.1]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 47C64E08001 for ; Wed, 25 May 2011 16:09:50 +0900 (JST) Received: from m106.s.css.fujitsu.com (m106.s.css.fujitsu.com [10.240.81.146]) by s3.gw.fujitsu.co.jp (Postfix) with ESMTP id 14C1B1DB8037 for ; Wed, 25 May 2011 16:09:50 +0900 (JST) Message-ID: <4DDCAB35.60109@jp.fujitsu.com> Date: Wed, 25 May 2011 16:09:41 +0900 From: KOSAKI Motohiro MIME-Version: 1.0 Subject: [PATCH 2/4] pagewalk: don't look up vma if walk->hugetlb_entry is unused References: <4DDCAAC0.20102@jp.fujitsu.com> In-Reply-To: <4DDCAAC0.20102@jp.fujitsu.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: kosaki.motohiro@jp.fujitsu.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, aarcange@redhat.com, akpm@linux-foundation.org, n-horiguchi@ah.jp.nec.com, kamezawa.hiroyu@jp.fujitsu.com Currently, walk_page_range() call find_vma() every page table walk iteration. but it's completely unnecessary if walk->hugetlb_entry is unused. And we don't have to assume find_vma() is lightweight operation. Thus this patch check walk->hugetlb_entry and avoid find_vma() call if possible. This patch also makes some cleanups. 1) remove ugly uninitialized_var() and 2) #ifdef in function body. Signed-off-by: KOSAKI Motohiro --- mm/pagewalk.c | 43 +++++++++++++++++++++++++++++++++++++------ 1 files changed, 37 insertions(+), 6 deletions(-) diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 606bbb4..ee4ff87 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -126,7 +126,39 @@ static int walk_hugetlb_range(struct vm_area_struct *vma, return 0; } -#endif + +static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk) +{ + struct vm_area_struct *vma; + + /* We don't need vma lookup at all. */ + if (!walk->hugetlb_entry) + return NULL; + + VM_BUG_ON(!rwsem_is_locked(&walk->mm->mmap_sem)); + vma = find_vma(walk->mm, addr); + if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma)) + return vma; + + return NULL; +} + +#else /* CONFIG_HUGETLB_PAGE */ +static struct vm_area_struct* hugetlb_vma(unsigned long addr, struct mm_walk *walk) +{ + return NULL; +} + +static int walk_hugetlb_range(struct vm_area_struct *vma, + unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + return 0; +} + +#endif /* CONFIG_HUGETLB_PAGE */ + + /** * walk_page_range - walk a memory map's page tables with a callback @@ -165,18 +197,17 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, addr); do { - struct vm_area_struct *uninitialized_var(vma); + struct vm_area_struct *vma; next = pgd_addr_end(addr, end); -#ifdef CONFIG_HUGETLB_PAGE /* * handle hugetlb vma individually because pagetable walk for * the hugetlb page is dependent on the architecture and * we can't handled it in the same manner as non-huge pages. */ - vma = find_vma(walk->mm, addr); - if (vma && vma->vm_start <= addr && is_vm_hugetlb_page(vma)) { + vma = hugetlb_vma(addr, walk); + if (vma) { if (vma->vm_end < next) next = vma->vm_end; /* @@ -189,7 +220,7 @@ int walk_page_range(unsigned long addr, unsigned long end, pgd = pgd_offset(walk->mm, next); continue; } -#endif + if (pgd_none_or_clear_bad(pgd)) { if (walk->pte_hole) err = walk->pte_hole(addr, next, walk); -- 1.7.3.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org