公开(公告)号：US10037173B2

公开(公告)日：2018-07-31

申请号：US15236171

申请日：2016-08-12

Applicant: Google LLC

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

IPC: G06F12/08 ,  G06F3/06 ,  G06F12/0811 ,  G06F12/0815

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 ,  Y02D10/13

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：US20190073314A1

公开(公告)日：2019-03-07

申请号：US16182695

申请日：2018-11-07

Applicant: Google LLC

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

IPC: G06F12/1009 ,  G06F12/121

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.

公开(公告)号：US10705975B2

公开(公告)日：2020-07-07

申请号：US16182695

申请日：2018-11-07

Applicant: Google LLC

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

IPC: G06F12/10 ,  G06F12/1009 ,  G06F12/121

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.

公开(公告)号：US10152427B2

公开(公告)日：2018-12-11

申请号：US15235495

申请日：2016-08-12

Applicant: Google LLC

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

IPC: G06F12/10 ,  G06F12/1009 ,  G06F12/121

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.

公开(公告)号：US10108550B2

公开(公告)日：2018-10-23

申请号：US15273433

申请日：2016-09-22

Applicant: Google LLC

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

IPC: G06F12/08 ,  G06F12/0868 ,  G06F12/0871 ,  G06F12/0873 ,  G06F12/12 ,  G06F12/1009 ,  G06F12/1027

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：US10474580B2

公开(公告)日：2019-11-12

申请号：US16113285

申请日：2018-08-27

Applicant: Google LLC

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

IPC: G06F12/08 ,  G06F12/0868 ,  G06F12/0871 ,  G06F12/0873 ,  G06F12/12 ,  G06F12/1009 ,  G06F12/1027 ,  G06F12/02 ,  G06F12/04 ,  G06F12/0815

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：US20180365157A1

公开(公告)日：2018-12-20

申请号：US16113285

申请日：2018-08-27

Applicant: Google LLC

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

IPC: G06F12/0868 ,  G06F12/04 ,  G06F12/02 ,  G06F12/0871 ,  G06F12/0873 ,  G06F12/1009 ,  G06F12/12 ,  G06F12/1027 ,  G06F12/0815

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.