linux-kernel - Re: [RFC][PATCH 0/9] extend hugepage migration

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Date:	Thu, 21 Mar 2013 07:49:48 +0800
From:	Simon Jeons <simon.jeons@...il.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 0/9] extend hugepage migration

Hi Naoya,
On 03/21/2013 05:35 AM, Naoya Horiguchi wrote:
> On Wed, Mar 20, 2013 at 07:43:44AM +0800, Simon Jeons wrote:
> ...
>>> Easy patch access:
>>>   git@...hub.com:Naoya-Horiguchi/linux.git
>>>   branch:extend_hugepage_migration
>>>
>>> Test code:
>>>   git@...hub.com:Naoya-Horiguchi/test_hugepage_migration_extension.git
>> git clone
>> git@...hub.com:Naoya-Horiguchi/test_hugepage_migration_extension.git
>> Cloning into test_hugepage_migration_extension...
>> Permission denied (publickey).
>> fatal: The remote end hung up unexpectedly
> Sorry, wrong url.
> git://github.com/Naoya-Horiguchi/test_hugepage_migration_extension.git
> or
> https://github.com/Naoya-Horiguchi/test_hugepage_migration_extension.git
> should work.

When I hacking arch/x86/mm/hugetlbpage.c like this,
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index ae1aa71..87f34ee 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -354,14 +354,13 @@ hugetlb_get_unmapped_area(struct file *file,
unsigned long addr,

#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/

-#ifdef CONFIG_X86_64
static __init int setup_hugepagesz(char *opt)
{
unsigned long ps = memparse(opt, &opt);
if (ps == PMD_SIZE) {
hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
- } else if (ps == PUD_SIZE && cpu_has_gbpages) {
- hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
+ } else if (ps == PUD_SIZE) {
+ hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT+4);
} else {
printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
ps >> 20);

I set boot=hugepagesz=1G hugepages=10, then I got 10 32MB huge pages.
What's the difference between these pages which I hacking and normal
huge pages?

>
> Thanks,
> Naoya

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