linux-kernel - Re: [PATCH v3 1/3] mm: document zone device struct page field usage

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Message-ID: <131f7c2d-704e-6f58-a330-e62d2ef5539e@nvidia.com>
Date:   Thu, 25 Jul 2019 10:49:59 -0700
From:   Ralph Campbell <rcampbell@...dia.com>
To:     Jason Gunthorpe <jgg@...lanox.com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>,
        "Matthew Wilcox" <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Christoph Lameter" <cl@...ux.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Pekka Enberg <penberg@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Christoph Hellwig <hch@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v3 1/3] mm: document zone device struct page field usage


On 7/24/19 6:22 PM, Jason Gunthorpe wrote:
> On Wed, Jul 24, 2019 at 04:26:58PM -0700, Ralph Campbell wrote:
>> Struct page for ZONE_DEVICE private pages uses the page->mapping and
>> and page->index fields while the source anonymous pages are migrated to
>> device private memory. This is so rmap_walk() can find the page when
>> migrating the ZONE_DEVICE private page back to system memory.
>> ZONE_DEVICE pmem backed fsdax pages also use the page->mapping and
>> page->index fields when files are mapped into a process address space.
>>
>> Add comments to struct page and remove the unused "_zd_pad_1" field
>> to make this more clear.
>>
>> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
>> Reviewed-by: John Hubbard <jhubbard@...dia.com>
>> Cc: Matthew Wilcox <willy@...radead.org>
>> Cc: Vlastimil Babka <vbabka@...e.cz>
>> Cc: Christoph Lameter <cl@...ux.com>
>> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
>> Cc: Jérôme Glisse <jglisse@...hat.com>
>> Cc: "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
>> Cc: Lai Jiangshan <jiangshanlai@...il.com>
>> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
>> Cc: Pekka Enberg <penberg@...nel.org>
>> Cc: Randy Dunlap <rdunlap@...radead.org>
>> Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
>> Cc: Christoph Hellwig <hch@....de>
>> Cc: Jason Gunthorpe <jgg@...lanox.com>
>> Cc: Andrew Morton <akpm@...ux-foundation.org>
>> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
>>   include/linux/mm_types.h | 11 ++++++++++-
>>   1 file changed, 10 insertions(+), 1 deletion(-)
> 
> Ralph, you marked some of thes patches as mm/hmm, but I feel it is
> best if Andrew takes them through the normal -mm path.
> 
> They don't touch hmm.c or mmu notifiers so I don't forsee conflicts,
> and I don't feel comfortable to review this code.
> 
> Regards,
> Jason
> 

Fine with me. I should have been clear in the cover letter which
tree to target.