Dram-based Storage Caching Method and Dram-based Smart Terminal

Content Provider	The Lens
Abstract	Embodiments of the present disclosure provide a DRAM-based storage caching method for a smart terminal, and the method includes: capturing an IO delivered by an upper-layer application; determining, based on a configuration policy, whether the IO belongs to a pre-specified to-be-cached IO type; and when the IO belongs to the pre-specified to-be-cached IO type, performing a corresponding caching operation for the IO in a DRAM disk based on a read/write type of the IO and a preset caching policy, where the DRAM disk is a block device created by using a reserved part of DRAM space of an operating system.
Related Links	https://www.lens.org/lens/patent/009-880-063-932-602/frontpage
Language	English
Publisher Date	2019-08-22
Access Restriction	Open
Content Type	Text
Resource Type	Patent
Jurisdiction	United States of America
Date Applied	2019-05-01
Applicant	Huawei Tech Co Ltd
Application No.	201916400319
Claim	A DRAM-based storage caching method for a smart terminal, comprising: capturing an input/output (IO) delivered by an upper-layer application; determining, based on a configuration policy, whether the IO belongs to a pre-specified to-be-cached IO type; and when the IO belongs to the pre-specified to-be-cached IO type, performing a corresponding caching operation for the IO in a DRAM disk based on a read/write type of the IO and a preset caching policy, wherein the DRAM disk is a block device created by using a reserved part of DRAM space of an operating system. The method according to claim 1 , wherein determining whether the IO belongs to the pre-specified to-be-cached IO type comprises: determining a size relationship between a size of the IO and a preset threshold, and when the size of the IO is smaller than the preset threshold, determining that the IO belongs to the pre-specified to-be-cached IO type. The method according to claim 1 , wherein determining whether the IO belongs to the pre-specified to-be-cached IO type comprises: determining whether a type of the IO is a user pre-specified IO type, and when the type of the IO is the user pre-specified IO type, determining that the IO belongs to the pre-specified to-be-cached IO type, wherein the user pre-specified IO type is a hot data IO or a random IO. The method according to claim 1 , wherein performing the corresponding caching operation for the IO in the DRAM disk based on the read/write type of the IO and the preset caching policy comprises: determining the read/write type of the IO, and when the IO is a write IO, caching the write IO in the DRAM disk, or when the IO is a read IO, reading data operated by the read IO and caching the data in the DRAM disk. The method according to claim 1 , further comprising: when the DRAM disk is short of space, selecting to flush dirty data back into a bottom-layer device according to a preset policy. The method according to claim 5 , further comprising: in a case of a normal switch-off of the smart terminal, before the switch-off, flushing all dirty data cached in the DRAM disk back into the bottom-layer device, and disabling caching or setting the caching policy to write-through. The caching method according to claim 1 , wherein the method further comprises: in a case of a forced switch-off or a restart of the smart terminal, at the beginning of the forced switch-off or the restart, flushing back the dirty data, and disabling caching or setting the caching policy to write-through. A terminal having a DRAM, the terminal comprising: a capture module configured to capture an input/output (IO) delivered by an upper-layer application; a judgment module configured to determine, based on a configuration policy, whether the IO captured by the capture module belongs to a to-be-cached IO type; and a caching operation module configured to: when the IO captured by the capture module belongs to the to-be-cached IO type, perform a corresponding caching operation for the IO in a DRAM disk based on a read/write type of the IO and a preset caching policy, wherein the DRAM disk is a block device created by using a reserved part of DRAM space of an operating system of the termina The terminal according to claim 8 , wherein the judgment module comprises: a first judgment unit configured to determine a size relationship between a size of the IO captured by the capture module and a preset threshold, and a determining unit configured to: when the first judgment unit determines that the size of the IO is smaller than the preset threshold, determine that the IO belongs to a to-be-cached IO type. The terminal according to claim 8 , wherein the judgment module comprises: a first judgment unit configured to determine whether a type of the IO is a user pre-specified IO type, and a determining unit configured to: when the first judgment unit determines that the type of the IO is the user pre-specified IO type, determine that the IO belongs to the to-be-cached IO type, wherein the user pre-specified IO type is a hot data IO or a random IO. The terminal according to claim 9 , wherein the caching operation module comprises: a second judgment unit configured to: when the first judgment unit determines that the size of the IO is smaller than the preset threshold or that the type of the IO is a user pre-specified IO type, determine a read/write type of the IO, and a caching unit configured to: when the second judgment unit determines that the IO is a write IO, cache the write IO into the DRAM disk, or configured to: when the second judgment unit determines that the IO is a read IO, read data operated by the read IO from a bottom-layer storage device of the terminal, and cache the data in the DRAM disk.
CPC Classification	ELECTRIC DIGITAL DATA PROCESSING
Extended Family	154-088-037-735-945 049-240-720-398-979 007-491-896-001-763 179-904-600-967-965 009-880-063-932-602
Patent ID	20190258582
Inventor/Author	Miao Xie Wang Yijing Wang Bintian Chen Qiulin
IPC	G06F12/0893 G06F12/0804 G06F12/0868
Status	Discontinued
Simple Family	007-491-896-001-763 049-240-720-398-979 009-880-063-932-602 179-904-600-967-965 154-088-037-735-945
CPC (with Group)	G06F3/061 G06F3/0656 G06F3/0688 G06F3/0685 G06F3/0646 G06F3/0655 G06F3/0679 G06F12/0868 G06F12/0871 G06F12/0888 G06F2212/1016 G06F2212/305 G06F2212/313 G06F2212/461 G06F12/0893 G06F3/06 G06F12/0804 G06F2212/224
Issuing Authority	United States Patent and Trademark Office (USPTO)
Kind	Patent Application Publication