lkml.org 
[lkml]   [2019]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] mm: Introduce GFP_PGTABLE
From
Date


On 01/12/2019 05:42 PM, Matthew Wilcox wrote:
> On Sat, Jan 12, 2019 at 03:56:38PM +0530, Anshuman Khandual wrote:
>> All architectures have been defining their own PGALLOC_GFP as (GFP_KERNEL |
>> __GFP_ZERO) and using it for allocating page table pages.
>
> Except that's not true.
>
>> +++ b/arch/x86/mm/pgtable.c
>> @@ -13,19 +13,17 @@ phys_addr_t physical_mask __ro_after_init = (1ULL << __PHYSICAL_MASK_SHIFT) - 1;
>> EXPORT_SYMBOL(physical_mask);
>> #endif
>>
>> -#define PGALLOC_GFP (GFP_KERNEL_ACCOUNT | __GFP_ZERO)
>> -
>> #ifdef CONFIG_HIGHPTE
>
> ...
>
>> pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
>> {
>> - return (pte_t *)__get_free_page(PGALLOC_GFP & ~__GFP_ACCOUNT);
>> + return (pte_t *)__get_free_page(GFP_PGTABLE & ~__GFP_ACCOUNT);
>> }
>
> I think x86 was the only odd one out here, but you'll need to try again ...

IIUC the user page table pages need __GFP_ACCOUNT not the kernel ones. Hence
in the above function it clears out __GFP_ACCOUNT for kernel page table page
allocations but where as by default it has got __GFP_ACCOUNT which would be
used for user page tables. Instead we can make X86 user allocations add
__GFP_ACCOUNT (like other archs) to generic GFP_PGTABLE when ever required.

\
 
 \ /
  Last update: 2019-01-12 13:57    [W:0.078 / U:0.416 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site