linux-kernel - Re: [PATCH 1/2] mm: rename mm->nr_ptes to mm->nr

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Date:	Tue, 13 Jan 2015 13:49:10 -0800
From:	Dave Hansen <dave.hansen@...ux.intel.com>
To:	Cyrill Gorcunov <gorcunov@...il.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 1/2] mm: rename mm->nr_ptes to mm->nr_pgtables

On 01/13/2015 01:43 PM, Cyrill Gorcunov wrote:
> On Tue, Jan 13, 2015 at 09:14:15PM +0200, Kirill A. Shutemov wrote:
>> We're going to account pmd page tables too. Let's rename mm->nr_pgtables
>> to something more generic.
>>
>> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
>> --- a/fs/proc/task_mmu.c
>> +++ b/fs/proc/task_mmu.c
>> @@ -64,7 +64,7 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
>>  		data << (PAGE_SHIFT-10),
>>  		mm->stack_vm << (PAGE_SHIFT-10), text, lib,
>>  		(PTRS_PER_PTE * sizeof(pte_t) *
>> -		 atomic_long_read(&mm->nr_ptes)) >> 10,
>> +		 atomic_long_read(&mm->nr_pgtables)) >> 10,
> 
> This implies that (PTRS_PER_PTE * sizeof(pte_t)) = (PTRS_PER_PMD * sizeof(pmd_t))
> which might be true for all archs, right?

I wonder if powerpc is OK on this front today.  This diagram:

	http://linux-mm.org/PageTableStructure

says that they use a 128-byte "pte" table when mapping 16M pages.  I
wonder if they bump mm->nr_ptes for these.
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