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

From: Simon Jeons
Date: Thu Mar 21 2013 - 19:46:43 EST

Hi Michal,
On 03/21/2013 08:56 PM, Michal Hocko wrote:
On Thu 21-03-13 07:49:48, Simon Jeons wrote:
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,


-#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?
How is this related to the patch set?
Please _stop_ distracting discussion to unrelated topics!

Nothing personal but this is just wasting our time.

Sorry kindly Michal, my bad.
Btw, could you explain this question for me? very sorry waste your time.

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