CN110007869B - Memory data copying method, device, equipment and computer storage medium - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/065—Replication mechanisms
Abstract
The invention discloses a memory data copying method, which comprises the following steps: receiving a memory data copying instruction for copying the data of the source IOB to the target IOB; and copying the logical page number of the physical page to be copied in the source IOB to the destination IOB according to the memory data copy instruction, and adding one to the reference count of the physical page to be copied in the source IOB. Therefore, when the data of the physical page corresponding to the source IOB is copied to the destination IOB, the real data corresponding to the source IOB does not need to be copied to the destination IOB, and only the logic number of the physical page corresponding to the source IOB needs to be copied to the destination IOB, so that the reference relationship between the source IOB and the destination IOB can be established, the copy frequency of the memory data is reduced, and the IO processing efficiency is improved; the invention also discloses a memory data copying device, equipment and a computer storage medium, which can also realize the technical effects.
Description
Technical Field
The present invention relates to the field of memory copy technologies, and in particular, to a memory data copy method, apparatus, device, and computer storage medium.
Background
In a storage system, memory management is a general module, and the memory management affects an IO (Input Output) processing flow of the entire storage system, and if the memory management efficiency is not high enough, the performance of the entire storage system will be affected. At present, when the memory is copied, the real data needs to be copied, the copy frequency of the memory copy mode is more, and for a system with hundreds of thousands or millions of IOPS (IO per second, input and output), the copy frequency of the memory in each IO processing process directly influences the IO processing efficiency.
Therefore, how to reduce the copy number of the memory data and improve the IO processing efficiency is a problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a memory data copying method, a memory data copying device, memory data copying equipment and a computer storage medium, so that the memory data copying times are reduced, and the IO processing efficiency is improved.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
a memory data copying method comprises the following steps:
receiving a memory data copying instruction for copying the data of the source IOB to the target IOB;
and copying the logical page number of the physical page to be copied in the source IOB to the target IOB according to the memory data copying instruction, and adding one to the reference count of the physical page to be copied in the source IOB.
Copying a logical page number of a physical page to be copied in the source IOB to the destination IOB according to the memory data copy instruction, including:
judging whether the destination IOB has a logical page number of a corresponding physical page;
if the corresponding logical page number does not exist, copying the logical page number of the physical page to be copied in the source IOB to the destination IOB;
if the corresponding logical page number exists, judging whether the physical page to be copied in the source IOB is the whole physical page or not; and if the physical page is the whole physical page, subtracting one from the reference count of the physical page corresponding to the target IOB, and copying the logical page number of the physical page to be copied in the source IOB to the target IOB.
Wherein each IOB comprises: a bitmap indicating whether or not each physical page corresponding to the IOB stores data, a logical page number indicating the physical page of the IOB storing data, and a connector for pointing to the next IOB.
Wherein the incrementing the reference count of the physical page to be copied in the source IOB by one comprises:
adding one to a reference count recorded in a page description table and of a physical page to be copied in the source IOB; and recording the corresponding relation between the logical page number of each physical page and the structure page of the page in the page description table.
A memory data copying apparatus, comprising:
the instruction receiving module is used for receiving a memory data copying instruction for copying the data of the source IOB to the target IOB;
the data copying module is used for copying the logical page number of the physical page to be copied in the source IOB to the destination IOB according to the memory data copying instruction;
and the reference count updating module is used for adding one to the reference count of the physical page to be copied in the source IOB.
Wherein the data copy module comprises:
a first judging unit, configured to judge whether the destination IOB has a logical page number of a corresponding physical page;
a first copy unit, configured to copy, when there is no corresponding logical page number, a logical page number of a physical page to be copied in the source IOB to the destination IOB;
a second determining unit, configured to determine whether a physical page to be copied in the source IOB is a whole physical page when there is a corresponding logical page number;
a second copy unit, configured to copy, to the destination IOB, a logical page number of a physical page to be copied in the source IOB when the physical page to be copied in the source IOB is an entire physical page;
and the first updating unit is used for reducing the reference count of the physical page corresponding to the target IOB by one when the physical page to be copied in the source IOB is the whole physical page.
Wherein the data copy module further comprises:
a second updating unit, configured to, when a physical page to be copied in the source IOB is not an entire physical page, decrement a reference count of a physical page corresponding to the destination IOB by one;
a physical page allocation unit for allocating a new physical page to the destination IOB;
and the third copy unit is used for copying the original data in the physical page corresponding to the destination IOB and the data of the physical page to be copied in the source IOB to the new physical page.
A memory data copying apparatus comprising:
a memory for storing a computer program;
and the processor is used for realizing the steps of the memory data copying method when executing the computer program.
A computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described memory data copying method.
According to the above scheme, the memory data copying method provided by the embodiment of the invention comprises the following steps: receiving a memory data copying instruction for copying the data of the source IOB to the target IOB; and copying the logical page number of the physical page to be copied in the source IOB to the target IOB according to the memory data copying instruction, and adding one to the reference count of the physical page to be copied in the source IOB.
It can be seen that, in this embodiment, when data of a physical page corresponding to a source IOB is copied to a destination IOB, real data corresponding to the source IOB does not need to be copied to the destination IOB, only a logical number of the physical page corresponding to the source IOB needs to be copied to the destination IOB, and a reference count of a physical page to be copied in the source IOB is incremented, so that a reference relationship between the source IOB and the destination IOB can be established, thereby reducing the copy frequency of memory data and improving IO processing efficiency;
the invention also discloses a memory data copying device, equipment and a computer storage medium, which can also realize the technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a memory data copying method disclosed in an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating another memory data copying method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a memory data copying apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a memory data copying method, a memory data copying device, memory data copying equipment and a computer storage medium, which aim to reduce the copying times of memory data and improve the IO processing efficiency.
Referring to fig. 1, a memory data copying method provided in an embodiment of the present invention includes:
s101, receiving a memory data copying instruction for copying data of a source IOB to a target IOB;
specifically, IOBs (input Output buffers) are input/Output buffers, and each IOB corresponds to a predetermined number of physical pages; in this embodiment, the memory management is specifically performed on the basis of the Linux memory management through the kernel module. The kernel module is loaded when the equipment is started, and when physical pages are allocated to the IOB, the physical page allocation interface provided by the Linux kernel is called to realize the allocation of the physical pages with the appointed number to the IOB, and the logical page numbers starting from 0 are used for coding; the corresponding relation between the logical page number of each physical page and the Linux struct page structure is maintained through a page description table page _ descriptor, and the struct page structure with the logical page number i can be obtained through pd [ i ].
In this embodiment, the memory data copy instruction is an instruction for copying data to be copied stored in a physical page corresponding to a source IOB (src _ IOB) to a physical page corresponding to a destination IOB (dst _ IOB); further, in the present solution, each IOB includes: a bitmap indicating whether or not each physical page corresponding to the IOB stores data, a logical page number indicating the physical page of the IOB storing data, and a connector for pointing to the next IOB. Specifically, the IOB structure is as follows:
it can be seen from the IOB structure that the bitmap in the structure is a bitmap for maintaining whether each physical page corresponding to the IOB structure is valid, the bitmap is 8 uints 8_ t, and each bit corresponds to a sector in pages [8] and whether data exists, so that whether the physical page corresponding to the IOB stores data can be reflected through the bitmap; pages [8] in the structure are used to indicate the logical page number of at most 8 pages corresponding to the IOB, and it can be seen that an IOB has at most 8 pages, namely 32KB memory; next is a connector used to point to the next IOB for the case of greater than 32KB of memory.
S102, copying the logical page number of the physical page to be copied in the source IOB to the destination IOB according to the memory data copying instruction, and adding one to the reference count of the physical page to be copied in the source IOB.
In this embodiment, when the copy instruction copy of the memory data is received (dst _ IOB, src _ IOB), the source IOB and the destination IOB have already been determined, and therefore when the data in the source IOB is copied to the destination IOB, in order to reduce the number of times of copying real data, in this embodiment, only the logical page number corresponding to the data to be copied is copied to the destination IOB, and the reference relationship between the source IOB and the destination IOB is established in this way, so that when the data corresponding to the destination IOB is accessed, the data in the source IOB can be directly accessed according to the logical page number of the destination IOB; in order to record that data in the source IOB has been referred to by other IOBs, after the logical page number of the physical page to be copied in the source IOB is copied to the destination IOB, the reference count of the physical page to be copied in the source IOB needs to be increased by one, which represents that the physical page is referred to by other IOBs.
It should be noted that, in this embodiment, the reference count of the physical page is maintained in the page descriptor table, which is several bits of pd [ i ], and therefore, adding one to the reference count of the physical page to be copied in the source IOB may include: adding one to a reference count recorded in a page description table and of a physical page to be copied in the source IOB; the page description table records the corresponding relationship between the logical page number of each physical page and the page structure struct page.
It can be seen that the page description table not only describes the corresponding relationship between the logical page number and the page structure structpage of each physical page, but also describes the reference count of each physical page, so that after the physical page is referenced or released, the reference count can be directly changed to implement the operation.
In summary, in this embodiment, a physical page allocation function provided by a Linux kernel may be called by a kernel module to allocate a physical page to an IOB, and a page _ descriptor table is used to maintain a corresponding relationship between a physical page of each logical page number and a Linux page. And the structure of the IOB can be expressed as a memory, the structure realizes the allocation and management of pages by using bitmap, pages, next and the like, when the memory is copied, the copy of real data is replaced by the copy of logical page numbers, the zero copy of memory data is realized, the times of memory copy can be effectively reduced, the performance of a system is improved, and the IOPS of the system is improved.
Referring to fig. 2, a memory data copying method provided in an embodiment of the present invention includes:
s201, receiving a memory data copying instruction for copying data of a source IOB to a target IOB;
s202, judging whether the destination IOB has a logical page number of a corresponding physical page; if not, executing S203, if yes, executing S204;
s203, copying the logical page number of the physical page to be copied in the source IOB to the destination IOB;
s204, judging whether the physical page to be copied in the source IOB is the whole physical page or not; if yes, go to S205; if not, executing S206;
s205, subtracting one from the reference count of the physical page corresponding to the destination IOB, and copying the logical page number of the physical page to be copied in the source IOB to the destination IOB.
S206, subtracting one from the reference count of the physical page corresponding to the target IOB, allocating a new physical page to the target IOB, and copying the original data in the physical page corresponding to the target IOB and the data of the physical page to be copied in the source IOB to the new physical page.
In this embodiment, a specific copy policy is provided for memory data copy, for example:
1. if the source IOB (src _ IOB) has pages and the destination IOB (dst _ IOB) has no pages, then S203 is directly performed; the src _ iob page indicates that pages [8] corresponding to the src _ iob have a page number, that is, the data to be copied in the physical page is in a paged state, since the memory data copy instruction is executed, the src _ iob is generally in a paged state; dst _ iob has no page, representing that dst _ iob has no allocated physical page, that is, no valid page number exists in pages [8] of dst _ iob; in this case, the logical page number in src _ iob.pages may be directly copied into dst _ iob.pages, and the reference count of the corresponding physical page in src _ iob may be incremented by 1. In this case, only the physical page number is copied, and no real memory copy is made, so that zero copy is realized.
2. If src _ iob has pages, dst _ iob has pages, and the entire page is to be overwritten, then S205 is performed; the dst _ iob has pages, which represent that the dst _ iob originally has some data, and the data may refer to another iob page number, in this case, if the physical page to be copied in src _ iob is the whole physical page, the corresponding page referred by dst _ iob needs to be released, that is, the reference count of the physical page corresponding to dst _ iob is decreased by 1, then the logical page number in src _ iob is copied to dst _ iob, and the reference count of src _ iob is increased by 1, in this case, only the copy of the physical page is made, no real memory data copy is made, and zero copy is implemented.
3. If src _ iob has a page, dst _ iob has a page, but only part of the contents in the page is copied (during IO in the storage system, the memory copy may be in units of sectors (512 bytes), and there may be an operation of copying only a few sectors, but not copying the entire page), then S206 is performed;
that is, if pages [8] of dst _ iob has a page number, that is, this iob originally has some data, and the data may refer to another iob page number, for example:
dst_iob.pages[0]----iobx.pages[3]
dst _ iob refers to a certain page of iobx, and now data is copied to dst _ iob, and the copied data is not a complete page and is a few sectors of a page, so that the data cannot be directly copied into pages of dst _ iob because the page is a shared page of other people, and once the data is directly copied, another page iob is modified; therefore, it is necessary to cancel the reference to this page by dst _ iob, then allocate a new page to dst _ iob, which copies the contents of the old page first, and then copy the data of src _ iob into this new page. It can be seen that in this manner, the zero copy fails and a true page copy needs to be made.
In summary, in the present solution, multiple copy strategies are proposed for two conditions, namely whether the target IOB has a logical page number and whether the physical page to be copied in the source IOB is the entire physical page, as long as the condition that the physical page to be copied in the source IOB is the entire physical page is satisfied, when memory copy occurs, only the physical page number needs to be copied, and real memory copy is not performed, so that the efficiency of memory copy is improved.
In the following, the memory data copying apparatus provided in the embodiments of the present invention is introduced, and the memory data copying apparatus described below and the memory data copying method described above may be referred to each other.
Referring to fig. 3, an embodiment of the present invention provides a memory data copying apparatus, including:
an instruction receiving module 100, configured to receive a memory data copy instruction for copying data of a source IOB to a destination IOB;
a data copy module 200, configured to copy, according to the memory data copy instruction, a logical page number of a physical page to be copied in the source IOB to the destination IOB;
a reference count update module 300, configured to increment a reference count of a physical page to be copied in the source IOB by one.
Wherein the data copy module comprises:
a first judging unit, configured to judge whether the destination IOB has a logical page number of a corresponding physical page;
a first copy unit, configured to copy, when there is no corresponding logical page number, a logical page number of a physical page to be copied in the source IOB to the destination IOB;
a second determining unit, configured to determine whether a physical page to be copied in the source IOB is a whole physical page when there is a corresponding logical page number;
a second copy unit, configured to copy, to the destination IOB, a logical page number of a physical page to be copied in the source IOB when the physical page to be copied in the source IOB is an entire physical page;
and the first updating unit is used for reducing the reference count of the physical page corresponding to the target IOB by one when the physical page to be copied in the source IOB is the whole physical page.
Wherein the data copy module further comprises:
a second updating unit, configured to, when a physical page to be copied in the source IOB is not an entire physical page, decrement a reference count of a physical page corresponding to the destination IOB by one;
a physical page allocation unit for allocating a new physical page to the destination IOB;
and the third copy unit is used for copying the original data in the physical page corresponding to the destination IOB and the data of the physical page to be copied in the source IOB to the new physical page.
Wherein each IOB comprises: a bitmap indicating whether or not each physical page corresponding to the IOB stores data, a logical page number indicating the physical page of the IOB storing data, and a connector for pointing to the next IOB.
The reference count updating module is specifically configured to increment, by one, a reference count recorded in a page description table and a physical page to be copied in the source IOB; and recording the corresponding relation between the logical page number of each physical page and the structure page of the page in the page description table.
The embodiment of the invention also discloses memory data copying equipment, which comprises:
a memory for storing a computer program;
a processor, configured to implement the steps of the memory data copying method in the above embodiments when executing the computer program.
The embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the memory data copying method in the embodiment are realized.
Wherein the storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A memory data copying method is characterized by comprising the following steps:
receiving a memory data copying instruction for copying the data of the source IOB to the target IOB;
copying the logical page number of the physical page to be copied in the source IOB to the target IOB according to the memory data copying instruction, and adding one to the reference count of the physical page to be copied in the source IOB;
copying a logical page number of a physical page to be copied in the source IOB to the destination IOB according to the memory data copy instruction, including:
judging whether the destination IOB has a logical page number of a corresponding physical page;
if the corresponding logical page number does not exist, copying the logical page number of the physical page to be copied in the source IOB to the destination IOB;
if the corresponding logical page number exists, judging whether the physical page to be copied in the source IOB is the whole physical page or not; and if the physical page is the whole physical page, subtracting one from the reference count of the physical page corresponding to the target IOB, and copying the logical page number of the physical page to be copied in the source IOB to the target IOB.
2. The method for copying memory data according to claim 1, wherein if the physical page to be copied in the source IOB is not an entire physical page, the method for copying memory data further comprises:
and subtracting the reference count of the physical page corresponding to the target IOB by one, allocating a new physical page to the target IOB, and copying the original data in the physical page corresponding to the target IOB and the data of the physical page to be copied in the source IOB to the new physical page.
3. The memory data copying method of claim 1 or 2, wherein each IOB comprises: a bitmap indicating whether or not each physical page corresponding to the IOB stores data, a logical page number indicating the physical page of the IOB storing data, and a connector for pointing to the next IOB.
4. The memory data copying method according to claim 1 or 2, wherein the increasing the reference count of the physical page to be copied in the source IOB by one includes:
adding one to a reference count recorded in a page description table and of a physical page to be copied in the source IOB; and recording the corresponding relation between the logical page number of each physical page and the structure page of the page in the page description table.
5. An apparatus for copying memory data, comprising:
the instruction receiving module is used for receiving a memory data copying instruction for copying the data of the source IOB to the target IOB;
the data copying module is used for copying the logical page number of the physical page to be copied in the source IOB to the destination IOB according to the memory data copying instruction;
a reference count update module, configured to increment a reference count of a physical page to be copied in the source IOB by one;
wherein the data copy module comprises:
a first judging unit, configured to judge whether the destination IOB has a logical page number of a corresponding physical page;
a first copy unit, configured to copy, when there is no corresponding logical page number, a logical page number of a physical page to be copied in the source IOB to the destination IOB;
a second determining unit, configured to determine whether a physical page to be copied in the source IOB is a whole physical page when there is a corresponding logical page number;
a second copy unit, configured to copy, to the destination IOB, a logical page number of a physical page to be copied in the source IOB when the physical page to be copied in the source IOB is an entire physical page;
and the first updating unit is used for reducing the reference count of the physical page corresponding to the target IOB by one when the physical page to be copied in the source IOB is the whole physical page.
6. The memory data copying device according to claim 5, wherein the data copying module further comprises:
a second updating unit, configured to, when a physical page to be copied in the source IOB is not an entire physical page, decrement a reference count of a physical page corresponding to the destination IOB by one;
a physical page allocation unit for allocating a new physical page to the destination IOB;
and the third copy unit is used for copying the original data in the physical page corresponding to the destination IOB and the data of the physical page to be copied in the source IOB to the new physical page.
7. An in-memory data copying apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the memory data copying method according to any one of claims 1 to 4 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the memory data copying method according to any one of claims 1 to 4.
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| WO2016082191A1 (en) * | 2014-11-28 | 2016-06-02 | 华为技术有限公司 | File access method and apparatus |
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