From: Matthew Wilcox <willy@infradead.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: linux-mm@kvack.org, "Matthew Wilcox" <mawilcox@microsoft.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Christoph Lameter" <cl@linux.com>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
"Pekka Enberg" <penberg@kernel.org>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Jérôme Glisse" <jglisse@redhat.com>
Subject: Re: [PATCH v4 13/16] mm: Add pt_mm to struct page
Date: Wed, 2 May 2018 17:11:11 -0700 [thread overview]
Message-ID: <20180503001111.GA21199@bombadil.infradead.org> (raw)
In-Reply-To: <20180502081217.guqf6phmwnnw5t2q@kshutemo-mobl1>
On Wed, May 02, 2018 at 11:12:17AM +0300, Kirill A. Shutemov wrote:
> On Mon, Apr 30, 2018 at 01:22:44PM -0700, Matthew Wilcox wrote:
> > diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> > index e0e74e91f3e8..0e6117123737 100644
> > --- a/include/linux/mm_types.h
> > +++ b/include/linux/mm_types.h
> > @@ -134,7 +134,7 @@ struct page {
> > unsigned long _pt_pad_1; /* compound_head */
> > pgtable_t pmd_huge_pte; /* protected by page->ptl */
> > unsigned long _pt_pad_2; /* mapping */
> > - unsigned long _pt_pad_3;
> > + struct mm_struct *pt_mm;
>
> I guess it worth to have a comment that this field is only used of pgd
> page tables and therefore doesn't conflict with pmd_huge_pte.
Actually, it doesn't conflict with pmd_huge_pte -- it's in different
bits (both before and after this patch). What does 'conflict' with
pmd_huge_pte is the use of page->lru in the pgd. I have a plan to
eliminate that use of pgd->lru, but I need to do a couple of other
things first.
next prev parent reply other threads:[~2018-05-03 0:11 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-30 20:22 [PATCH v4 00/16] Rearrange " Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 01/16] s390: Use _refcount for pgtables Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 02/16] mm: Split page_type out from _mapcount Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 03/16] mm: Mark pages in use for page tables Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 04/16] mm: Switch s_mem and slab_cache in struct page Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 05/16] mm: Move 'private' union within " Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 06/16] mm: Move _refcount out of struct page union Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 07/16] slub: Remove page->counters Matthew Wilcox
2018-05-01 16:48 ` Christopher Lameter
2018-05-02 17:26 ` Matthew Wilcox
2018-05-02 22:17 ` Kirill A. Shutemov
2018-05-03 0:52 ` Matthew Wilcox
2018-05-03 15:03 ` Christopher Lameter
2018-05-03 18:28 ` Matthew Wilcox
2018-05-04 14:55 ` Christopher Lameter
2018-05-04 15:15 ` Matthew Wilcox
2018-05-04 16:29 ` Christopher Lameter
2018-04-30 20:22 ` [PATCH v4 08/16] mm: Combine first three unions in struct page Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 09/16] mm: Use page->deferred_list Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 10/16] mm: Move lru union within struct page Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 11/16] mm: Combine first two unions in " Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 12/16] mm: Improve struct page documentation Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 13/16] mm: Add pt_mm to struct page Matthew Wilcox
2018-05-02 8:12 ` Kirill A. Shutemov
2018-05-03 0:11 ` Matthew Wilcox [this message]
2018-04-30 20:22 ` [PATCH v4 14/16] mm: Add hmm_data " Matthew Wilcox
2018-04-30 20:22 ` [PATCH v4 15/16] slab,slub: Remove rcu_head size checks Matthew Wilcox
2018-05-01 16:46 ` Christopher Lameter
2018-04-30 20:22 ` [PATCH v4 16/16] slub: Remove kmem_cache->reserved Matthew Wilcox
2018-05-01 16:43 ` Christopher Lameter
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