From: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
linux-next@vger.kernel.org, linux-kernel@vger.kernel.org,
Linus <torvalds@linux-foundation.org>
Subject: Re: linux-next: manual merge of the akpm tree with Linus' tree
Date: Thu, 08 Mar 2012 17:59:02 +0800 [thread overview]
Message-ID: <4F5882E6.8080202@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120307235012.847af577.akpm@linux-foundation.org>
On 03/08/2012 03:50 PM, Andrew Morton wrote:
> Doh. The author reviewed that for me too!
>
> I'll drop it - please rework, retest and resend?
>
Andrew, the patch has been reworked.
Subject: [PATCH] hugetlb: drop prev_vma in hugetlb_get_unmapped_area_topdown()
After the call find_vma_prev(mm, addr, &prev_vma), the following condition
is always true:
!prev_vma || (addr >= prev_vma->vm_end)
it can happily drop prev_vma and use find_vma() instead of find_vma_prev().
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
---
arch/x86/mm/hugetlbpage.c | 18 +++++-------------
1 files changed, 5 insertions(+), 13 deletions(-)
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 8ecbb4b..0c1701b 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -308,7 +308,7 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
{
struct hstate *h = hstate_file(file);
struct mm_struct *mm = current->mm;
- struct vm_area_struct *vma, *prev_vma;
+ struct vm_area_struct *vma;
unsigned long base = mm->mmap_base, addr = addr0;
unsigned long largest_hole = mm->cached_hole_size;
int first_time = 1;
@@ -337,22 +337,14 @@ try_again:
if (!vma)
return addr;
- /*
- * new region fits between prev_vma->vm_end and
- * vma->vm_start, use it:
- */
- prev_vma = vma->vm_prev;
- if (addr + len <= vma->vm_start &&
- (!prev_vma || (addr >= prev_vma->vm_end))) {
+ if (addr + len <= vma->vm_start) {
/* remember the address as a hint for next time */
mm->cached_hole_size = largest_hole;
return (mm->free_area_cache = addr);
- } else {
+ } else if (mm->free_area_cache == vma->vm_end) {
/* pull free_area_cache down to the first hole */
- if (mm->free_area_cache == vma->vm_end) {
- mm->free_area_cache = vma->vm_start;
- mm->cached_hole_size = largest_hole;
- }
+ mm->free_area_cache = vma->vm_start;
+ mm->cached_hole_size = largest_hole;
}
/* remember the largest hole we saw so far */
--
1.7.7.6
next prev parent reply other threads:[~2012-03-08 9:59 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 6:53 linux-next: manual merge of the akpm tree with Linus' tree Stephen Rothwell
2012-03-08 7:32 ` Andrew Morton
2012-03-08 7:41 ` Stephen Rothwell
2012-03-08 7:50 ` Andrew Morton
2012-03-08 7:50 ` Xiao Guangrong
2012-03-08 9:59 ` Xiao Guangrong [this message]
2012-03-08 21:24 ` Andrew Morton
2012-03-08 23:42 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2019-12-02 2:17 Stephen Rothwell
2019-12-02 2:08 Stephen Rothwell
2018-10-15 7:22 Stephen Rothwell
2018-10-15 7:04 Stephen Rothwell
2018-03-26 8:56 Stephen Rothwell
2017-01-09 2:51 Stephen Rothwell
2016-12-12 5:49 Stephen Rothwell
2016-01-19 2:42 Stephen Rothwell
2016-01-19 2:36 Stephen Rothwell
2015-07-27 5:26 Stephen Rothwell
2013-09-10 4:38 Stephen Rothwell
2013-09-10 22:27 ` Andrew Morton
2013-09-10 22:29 ` Al Viro
2013-09-10 22:35 ` Andrew Morton
2013-09-10 22:36 ` Al Viro
2013-09-10 22:39 ` Al Viro
2013-09-10 22:41 ` Andrew Morton
2013-09-10 22:48 ` Al Viro
2013-09-10 22:59 ` Al Viro
2013-09-10 23:13 ` Andrew Morton
2013-09-10 23:55 ` Al Viro
2013-09-11 4:30 ` Stephen Rothwell
2013-09-10 23:37 ` Linus Torvalds
2013-09-10 23:53 ` Al Viro
2013-09-11 0:01 ` Linus Torvalds
2013-09-11 0:39 ` Dave Chinner
2013-09-13 0:56 ` Linus Torvalds
2013-09-13 1:12 ` Linus Torvalds
2013-09-13 1:35 ` Al Viro
2013-09-13 19:12 ` Linus Torvalds
2013-09-13 19:28 ` Linus Torvalds
2013-09-13 19:54 ` Linus Torvalds
2013-09-13 20:00 ` Al Viro
2013-09-13 20:18 ` Al Viro
2013-09-13 20:23 ` Al Viro
2013-09-13 20:25 ` Linus Torvalds
2013-09-13 20:31 ` Linus Torvalds
2013-09-13 20:31 ` Al Viro
2013-09-13 20:34 ` Linus Torvalds
2013-09-10 22:35 ` Linus Torvalds
2013-09-10 22:44 ` Andrew Morton
2013-09-11 0:30 ` Stephen Rothwell
2013-09-11 0:41 ` Linus Torvalds
2013-09-10 4:21 Stephen Rothwell
2013-09-10 4:09 Stephen Rothwell
2013-09-10 4:12 ` Stephen Rothwell
2013-09-09 5:38 Stephen Rothwell
2013-09-09 5:22 Stephen Rothwell
2013-09-09 5:16 Stephen Rothwell
2013-08-30 8:44 Stephen Rothwell
2013-05-27 6:20 Stephen Rothwell
2013-05-20 4:04 Stephen Rothwell
2013-05-20 12:19 ` Chris Mason
2013-05-13 5:20 Eric Paris
2013-05-13 2:07 Stephen Rothwell
2013-05-13 2:11 ` Eric Paris
2013-05-13 4:16 ` Stephen Rothwell
2013-05-13 4:49 ` Kees Cook
2013-05-13 5:14 ` Eric Paris
2013-05-02 6:01 Stephen Rothwell
2013-04-29 8:38 Stephen Rothwell
2013-04-19 7:40 Stephen Rothwell
2013-04-16 7:25 Stephen Rothwell
2013-04-03 6:10 Stephen Rothwell
2013-03-25 4:22 Stephen Rothwell
2013-03-04 2:21 Stephen Rothwell
2013-01-04 3:27 Stephen Rothwell
2012-12-11 5:25 Stephen Rothwell
2012-12-11 5:22 Stephen Rothwell
2012-12-11 7:58 ` Glauber Costa
2012-12-07 6:39 Stephen Rothwell
2012-11-30 6:24 Stephen Rothwell
2012-11-26 12:52 Stephen Rothwell
2012-11-26 12:48 Stephen Rothwell
2012-11-26 13:25 ` Xiaotian Feng
2012-11-26 12:34 Stephen Rothwell
2012-10-15 2:07 Stephen Rothwell
2012-10-15 22:14 ` Catalin Marinas
2012-10-01 14:15 Stephen Rothwell
2012-08-22 5:59 Stephen Rothwell
2012-08-22 8:58 ` Mel Gorman
2012-07-27 3:57 Stephen Rothwell
2012-07-02 6:39 Stephen Rothwell
2012-06-04 4:58 Stephen Rothwell
2012-05-31 4:24 Stephen Rothwell
2012-05-31 4:13 Stephen Rothwell
2012-05-31 7:25 ` Johannes Weiner
2012-05-31 8:24 ` Stephen Rothwell
2012-05-31 8:27 ` Stephen Rothwell
2012-05-21 8:23 Stephen Rothwell
2012-05-21 8:13 Stephen Rothwell
2012-05-21 8:16 ` Cyrill Gorcunov
2011-12-28 7:54 Stephen Rothwell
2011-11-08 3:24 Stephen Rothwell
2011-11-01 8:16 Stephen Rothwell
2011-11-01 10:47 ` Tao Ma
2011-09-16 6:09 Stephen Rothwell
2011-08-15 4:52 Stephen Rothwell
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4F5882E6.8080202@linux.vnet.ibm.com \
--to=xiaoguangrong@linux.vnet.ibm.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=sfr@canb.auug.org.au \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).