Messages in this thread | | | From | Jason Gunthorpe <> | Subject | Re: [PATCH v3 1/3] mm: document zone device struct page field usage | Date | Thu, 25 Jul 2019 01:22:29 +0000 |
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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
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