公开(公告)号：US20180081816A1

公开(公告)日：2018-03-22

申请号：US15273433

申请日：2016-09-22

Applicant: Google Inc.

Inventor： Joel Dylan Coburn ,  Albert Borchers ,  Christopher Lyle Johnson ,  Robert S. Sprinkle

IPC: G06F12/0868 ,  G06F12/0871 ,  G06F12/0873 ,  G06F12/12 ,  G06F12/1009 ,  G06F12/1027

CPC classification number: G06F12/0868 ,  G06F12/023 ,  G06F12/04 ,  G06F12/0815 ,  G06F12/0871 ,  G06F12/0873 ,  G06F12/1009 ,  G06F12/1027 ,  G06F12/12 ,  G06F2212/1016 ,  G06F2212/1024 ,  G06F2212/152 ,  G06F2212/3042 ,  G06F2212/305 ,  G06F2212/604 ,  G06F2212/652

Abstract: Methods, systems, and apparatus for receiving a request to access, from a main memory, data contained in a first portion of a first page of data, the first page of data having a first page size; initiating a page fault based on determining that the first page of data is not stored in the main memory; allocating a portion of the main memory equivalent to the first page size; transferring the first portion of the first page of data from the secondary memory to the allocated portion of the main memory without transferring the entire first page of data; and updating a first page table entry associated with the first portion of the first page of data to point to a location of the allocated portion of the main memory to which the first portion of the first page of data is transferred.

公开(公告)号：US20180018123A1

公开(公告)日：2018-01-18

申请号：US15267404

申请日：2016-09-16

Applicant: Google Inc.

Inventor： Monish Shah ,  Benjamin Charles Serebrin ,  Albert Borchers

IPC: G06F3/06

CPC classification number: G06F3/0647 ,  G06F3/0611 ,  G06F3/0656 ,  G06F3/0685 ,  G06F12/08 ,  G06F12/0868 ,  G06F12/1081 ,  G06F13/28 ,  G06F2212/1024 ,  G06F2212/312

Abstract: IOMMU map-in may be overlapped with second tier memory access, such that the two operations are at least partially performed at the same time. For example, when a second tier memory read into a storage device controller internal buffer is initiated, an IOMMU mapping may be built simultaneously. To achieve this overlap, a two-stage command buffer is used. In a first stage, content is read from a second tier memory address into the storage device controller internal buffer. In a second stage, the internal buffer is written into the DRAM physical address.

公开(公告)号：US20180046411A1

公开(公告)日：2018-02-15

申请号：US15236171

申请日：2016-08-12

Applicant: Google Inc.

Inventor： Joel Dylan Coburn ,  Albert Borchers ,  Christopher Lyle Johnson ,  Robert S. Sprinkle

IPC: G06F3/06 ,  G06F12/0815 ,  G06F12/0811

CPC classification number: G06F3/0685 ,  G06F3/0619 ,  G06F3/065 ,  G06F12/0811 ,  G06F12/0815 ,  G06F12/0835 ,  G06F12/0868 ,  G06F12/1009 ,  G06F12/1081 ,  G06F2212/1021 ,  G06F2212/283 ,  G06F2212/621

Abstract: Methods, systems, and apparatus for receiving a request to access, from a main memory, a first cache line of a page of data; determining that the first cache line is not stored in the main memory and is stored in a secondary memory, and in response: transferring the first cache line of the page of data from the secondary memory to the main memory without transferring the entire page of data, wherein a remaining portion of the page of data remains stored in the secondary memory; updating a page table entry associated with the page of data to point to a location of the page of data in the main memory; and transferring the remaining portion of the page of data from the secondary memory to the main memory.

公开(公告)号：US20180046378A1

公开(公告)日：2018-02-15

申请号：US15235495

申请日：2016-08-12

Applicant: Google Inc.

Inventor： Joel Dylan Coburn ,  Albert Borchers ,  Christopher Lyle Johnson ,  Robert S. Sprinkle

IPC: G06F3/06 ,  G06F12/123 ,  G06F12/1009

CPC classification number: G06F12/1009 ,  G06F12/121 ,  G06F2212/1024 ,  G06F2212/1032 ,  G06F2212/152 ,  G06F2212/657

Abstract: Methods, systems, and apparatus for determining whether an access bit is set for each page table entry of a page table based on a scan of the page table with at least one page table walker, the access bit indicating whether a page associated with the page table entry was accessed in a last scan period; incrementing a count for each page in response to determining that the access bit is set for the page table entry associated with the page; resetting the access bit after determining whether the access bit is set for each page table entry; receiving a request to access, from a main memory, a first page of data; initiating a page fault based on determining that the first page of data is not stored in the main memory; and servicing the page fault with a DMA engine.