From: Jason Gunthorpe <jgg@mellanox.com>
To: Ralph Campbell <rcampbell@nvidia.com>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Christoph Lameter" <cl@linux.com>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
"Martin Schwidefsky" <schwidefsky@de.ibm.com>,
"Pekka Enberg" <penberg@kernel.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Christoph Hellwig" <hch@lst.de>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Linus Torvalds" <torvalds@linux-foundation.org>
Subject: Re: [PATCH v3 1/3] mm: document zone device struct page field usage
Date: Thu, 25 Jul 2019 01:22:29 +0000 [thread overview]
Message-ID: <20190725012225.GB32003@mellanox.com> (raw)
In-Reply-To: <20190724232700.23327-2-rcampbell@nvidia.com>
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@nvidia.com>
> Reviewed-by: John Hubbard <jhubbard@nvidia.com>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Christoph Lameter <cl@linux.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Jérôme Glisse <jglisse@redhat.com>
> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
> Cc: Lai Jiangshan <jiangshanlai@gmail.com>
> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
> Cc: Pekka Enberg <penberg@kernel.org>
> Cc: Randy Dunlap <rdunlap@infradead.org>
> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Cc: Christoph Hellwig <hch@lst.de>
> Cc: Jason Gunthorpe <jgg@mellanox.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Linus Torvalds <torvalds@linux-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
next prev parent reply other threads:[~2019-07-25 1:22 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 23:26 [PATCH v3 0/3] mm/hmm: fixes for device private page migration Ralph Campbell
2019-07-24 23:26 ` [PATCH v3 1/3] mm: document zone device struct page field usage Ralph Campbell
2019-07-25 1:22 ` Jason Gunthorpe [this message]
2019-07-25 17:49 ` Ralph Campbell
2019-07-25 5:38 ` Christoph Hellwig
2019-07-25 18:19 ` Ralph Campbell
2019-07-24 23:26 ` [PATCH v3 2/3] mm/hmm: fix ZONE_DEVICE anon page mapping reuse Ralph Campbell
2019-08-02 8:31 ` Christoph Hellwig
2019-08-02 19:11 ` Andrew Morton
2019-07-24 23:27 ` [PATCH v3 3/3] mm/hmm: Fix bad subpage pointer in try_to_unmap_one Ralph Campbell
2019-07-25 2:03 ` Sasha Levin
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