CN108984270B - Memory allocation method and device for virtual machine - Google Patents
Memory allocation method and device for virtual machine Download PDFInfo
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- CN108984270B CN108984270B CN201810791584.7A CN201810791584A CN108984270B CN 108984270 B CN108984270 B CN 108984270B CN 201810791584 A CN201810791584 A CN 201810791584A CN 108984270 B CN108984270 B CN 108984270B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/455—Emulation; Interpretation; Software simulation, e.g. virtualisation or emulation of application or operating system execution engines
- G06F9/45533—Hypervisors; Virtual machine monitors
- G06F9/45558—Hypervisor-specific management and integration aspects
- G06F2009/45583—Memory management, e.g. access or allocation
Abstract
The invention discloses a memory allocation method and device of a virtual machine. The method comprises the following steps: reading a configuration file of a host machine of the virtual machine to acquire a memory space which is configured by a user and reserved for all the virtual machines running on the host machine of the virtual machine; according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines; when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine; operating the key virtual machine by adopting a first memory space reserved for the key virtual machine; and adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machines of the virtual machines to run the virtual machines except the key virtual machine in all the virtual machines. Therefore, the performance of the key virtual machine is guaranteed.
Description
Technical Field
The present invention relates to virtual machine technologies, and in particular, to a method and an apparatus for allocating memory of a virtual machine.
Background
With the development of virtualization technologies, the deployment of virtualization systems has increased. As more and more systems begin to access virtualized systems. More and more virtual machines run in a virtualization system, so that the phenomenon of memory over-distribution in the virtualization system is more and more prominent. The reason that the memory over-partition is that the memory space configured for all the virtual machines is larger than the actual memory space of the physical machine (host), is that when the load of the virtual machine is low, the virtual machine does not occupy all the configured memory all the time, and at this time, the same physical machine can run more virtual machines by using the memory over-partition. However, if the load of most virtual machines in the virtualization system is high, the total memory occupied by all the virtual machines exceeds the actual memory of the physical machine, the virtual machines will compete, and the performance of all the virtual machines will be seriously degraded.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a method and an apparatus for allocating memory of a virtual machine, which can ensure the performance of all virtual machines.
In one aspect, an embodiment of the present invention provides a method for allocating a memory of a virtual machine, where the method includes:
reading a configuration file of a host machine of the virtual machine to acquire a memory space which is configured by a user and reserved for all the virtual machines running on the host machine of the virtual machine;
according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines;
when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine;
operating the key virtual machine by adopting a first memory space reserved for the key virtual machine; and adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machines of the virtual machines to run the virtual machines except the key virtual machine in all the virtual machines.
Further, in an optional embodiment, the method further comprises:
before starting the virtual machine, identifying a key virtual machine according to the setting of a user on the virtual machine and/or the identification of the virtual machine.
Further, in an optional embodiment, after the step of learning the memory space configured by the user and reserved for all virtual machines running on the host machine of the virtual machine, the method further includes:
when receiving an instruction of a user for adding a second memory space for a key virtual machine in all the virtual machines when the virtual machines are operated, unlocking a first memory space reserved for the key virtual machine; adding a second memory space to a first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
Further, in an optional embodiment, after the step of learning the memory space configured by the user and reserved for all virtual machines running on the host machine of the virtual machine, the method further includes:
when receiving an instruction of a user for reducing a third memory space for a key virtual machine in all the virtual machines when the virtual machines are operated, unlocking a first memory space reserved for the key virtual machine; reducing a first memory space reserved for the key virtual machine by a third memory space;
locking a memory space obtained by subtracting the third memory space from the first memory space as a memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
In another aspect, an embodiment of the present invention provides a memory allocation apparatus for a virtual machine, where the apparatus includes: the system comprises a memory reading module, a first memory application module, a first memory locking module and a virtual machine operation module;
the memory reading module is used for: reading a configuration file of a host machine of the virtual machine to acquire a memory space which is configured by a user and reserved for all the virtual machines running on the host machine of the virtual machine;
the first memory application module is used for: according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines;
the first memory lock module is configured to: when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine;
the virtual machine running module is used for: operating the key virtual machine by adopting a first memory space reserved for the key virtual machine; and adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machines of the virtual machines to run the virtual machines except the key virtual machine in all the virtual machines.
Further, in an optional embodiment, the apparatus further comprises: a key virtual machine identification module that identifies a key virtual machine,
the virtual machine identification module is used for: before starting the virtual machine, identifying a key virtual machine according to the setting of a user on the virtual machine and/or the identification of the virtual machine.
Further, in an optional embodiment, the apparatus further comprises: a second memory space module for storing a second memory space,
the second memory space module is used for: after the memory reading module acquires memory spaces configured by a user and reserved for all virtual machines running on a host machine of the virtual machine, when an instruction of adding a second memory space for a key virtual machine in all the virtual machines by the user is received during running of the virtual machine, unlocking a first memory space reserved for the key virtual machine; adding a second memory space to a first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
the first memory locking module is further configured to: locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
the virtual machine running module is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
Further, in an optional embodiment, the apparatus further comprises a third memory space module,
the third memory space module is configured to: after the memory reading module acquires memory spaces configured by a user and reserved for all virtual machines running on a host machine of the virtual machine, when receiving an instruction of the user for reducing a third memory space for a key virtual machine in all the virtual machines when the virtual machine is running, unlocking a first memory space reserved for the key virtual machine; reducing a first memory space reserved for the key virtual machine by a third memory space;
the first memory locking module is further configured to: locking a memory space obtained by subtracting the third memory space from the first memory space as a memory space reserved for the key virtual machine;
the virtual machine running module is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
The embodiment of the invention has the advantages that for the key virtual machine, the performance of the key virtual machine cannot be seriously reduced, all or part of memory spaces distributed for all the virtual machines are reserved for the key virtual machine in a memory reservation mode, the memory spaces are only used for the key virtual machine, and other virtual machines cannot compete for the part of memory spaces. Therefore, even if other virtual machines compete, the key virtual machine still has available memory space, and the overall performance of the virtual machine is ensured.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart of a memory allocation method for a virtual machine according to an embodiment of the present invention;
fig. 2 is a block diagram of a memory allocation apparatus of a virtual machine according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In one aspect, an embodiment of the present invention provides a memory allocation method for a virtual machine, as shown in fig. 1, the method includes steps S101 to S107.
Step S101, reading a configuration file of a host of the virtual machine to acquire a memory space configured by a user and reserved for all virtual machines running on the host of the virtual machine.
The host uses Unix-like system, including but not limited to FreeBSD, OpenBSD, Solaris, Linux, etc. The virtualization software of the host is QEMU-KVM.
Step S103, according to the reserved memories of all the virtual machines running on the host machines of the virtual machines, when the virtual machines are started, the host machines of the virtual machines are applied for reserving a first memory space for a key virtual machine in all the virtual machines.
Wherein, if the memory value reserved by the virtual Machine needs to be changed, the memory value can be changed through an QMP (QEMU Machine Protocol) communication interface of QEMU-KVM.
In step S105, when it is determined that the first memory space is reserved for the key virtual machine, the first memory space reserved for the key virtual machine is locked.
Step S107, operating the key virtual machine by adopting a first memory space reserved for the key virtual machine; and adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machines of the virtual machines to run the virtual machines except the key virtual machine in all the virtual machines.
The embodiment of the invention has the advantages that for the key virtual machine, the performance of the key virtual machine cannot be seriously reduced, all or part of memory spaces distributed for all the virtual machines are reserved for the key virtual machine in a memory reservation mode, the memory spaces are only used for the key virtual machine, and other virtual machines cannot compete for the part of memory spaces. Therefore, even if other virtual machines compete, the key virtual machine still has available memory space, and the overall performance of the virtual machine is ensured.
Further, in an optional embodiment, the method further comprises:
before starting the virtual machine, identifying a key virtual machine according to the setting of a user on the virtual machine and/or the identification of the virtual machine.
Further, in an optional embodiment, after step S101, the method further includes:
when receiving an instruction of a user for adding a second memory space for a key virtual machine in all the virtual machines when the virtual machines are operated, unlocking a first memory space reserved for the key virtual machine; adding a second memory space to a first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
Further, in an optional embodiment, after step S101, the method further includes:
when receiving an instruction of a user for reducing a third memory space for a key virtual machine in all the virtual machines when the virtual machines are operated, unlocking a first memory space reserved for the key virtual machine; reducing a first memory space reserved for the key virtual machine by a third memory space;
locking a memory space obtained by subtracting the third memory space from the first memory space as a memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
In another aspect, an embodiment of the present invention provides a memory allocation apparatus for a virtual machine, as shown in fig. 2, the apparatus includes: the memory access module 201, the first memory application module 203, the first memory locking module 205, and the virtual machine running module 207.
The memory reading module 201 is configured to: reading a configuration file of a host machine of the virtual machine to acquire a memory space which is configured by a user and reserved for all the virtual machines running on the host machine of the virtual machine;
the first memory application module 203 is configured to: according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines;
the first memory lock module 205 is configured to: when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine;
the virtual machine execution module 207 is configured to: operating the key virtual machine by adopting a first memory space reserved for the key virtual machine; and adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machines of the virtual machines to run the virtual machines except the key virtual machine in all the virtual machines.
The embodiment of the invention has the advantages that for the key virtual machine, the performance of the key virtual machine cannot be seriously reduced, all or part of memory spaces distributed for all the virtual machines are reserved for the key virtual machine in a memory reservation mode, the memory spaces are only used for the key virtual machine, and other virtual machines cannot compete for the part of memory spaces. Therefore, even if other virtual machines compete, the key virtual machine still has available memory space, and the overall performance of the virtual machine is ensured.
Further, in an optional embodiment, the apparatus further comprises: a key virtual machine identification module that identifies a key virtual machine,
the virtual machine identification module is used for: before starting the virtual machine, identifying a key virtual machine according to the setting of a user on the virtual machine and/or the identification of the virtual machine.
Further, in an optional embodiment, the apparatus further comprises: a second memory space module for storing a second memory space,
the second memory space module is used for: after the memory reading module 201 learns the memory space 201 configured by the user and reserved for all virtual machines running on the host machine of the virtual machine, when an instruction of the user for adding a second memory space to a key virtual machine among all the virtual machines is received while the virtual machine is running, unlocking a first memory space reserved for the key virtual machine; adding a second memory space to a first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
the first memory lock module 205 is further configured to: locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
the virtual machine execution module 207 is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
Further, in an optional embodiment, the apparatus further comprises a third memory space module,
the third memory space module is configured to: after the memory reading module acquires memory spaces configured by a user and reserved for all virtual machines running on a host machine of the virtual machine, when receiving an instruction of the user for reducing a third memory space for a key virtual machine in all the virtual machines when the virtual machine is running, unlocking a first memory space reserved for the key virtual machine; reducing a first memory space reserved for the key virtual machine by a third memory space;
the first memory lock module 205 is further configured to: locking a memory space obtained by subtracting the third memory space from the first memory space as a memory space reserved for the key virtual machine;
the virtual machine execution module 207 is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A memory allocation method of a virtual machine is characterized by comprising the following steps:
reading a configuration file of a host machine of a virtual machine to acquire a memory space which is configured by a user and reserved for all virtual machines running on the host machine of the virtual machine;
according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines;
when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine;
operating the key virtual machine by adopting the first memory space reserved for the key virtual machine; and running the virtual machines except the key virtual machine in all the virtual machines by adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machine of the virtual machine.
2. The method of claim 1, further comprising:
before starting the virtual machine, identifying a key virtual machine according to the setting of the user on the virtual machine and/or the identification of the virtual machine.
3. The method of claim 1, wherein after the step of learning memory space configured by a user reserved for all virtual machines running on a host of the virtual machine, the method further comprises:
when receiving an instruction of adding a second memory space for a key virtual machine in all the virtual machines from the user during running of the virtual machines, unlocking the first memory space reserved for the key virtual machine; adding the second memory space to the first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
4. The method of claim 1, wherein after the step of learning memory space configured by a user reserved for all virtual machines running on a host of the virtual machine, the method further comprises:
when receiving an instruction that the user reduces a third memory space for a key virtual machine in all the virtual machines when the virtual machines are operated, unlocking the first memory space reserved for the key virtual machine; reducing the third memory space of the first memory space reserved for the key virtual machine;
locking the memory space obtained by subtracting the third memory space from the first memory space as the memory space reserved for the key virtual machine;
and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
5. A memory allocation apparatus for a virtual machine, comprising: the system comprises a memory reading module, a first memory application module, a first memory locking module and a virtual machine operation module;
the memory reading module is used for: reading a configuration file of a host machine of a virtual machine to acquire a memory space which is configured by a user and reserved for all virtual machines running on the host machine of the virtual machine;
the first memory application module is configured to: according to the reserved memories of all virtual machines running on the host machines of the virtual machines, when the virtual machines are started, applying for reserving a first memory space for a key virtual machine in all the virtual machines from the host machines of the virtual machines;
the first memory lock module is configured to: when determining that a first memory space is reserved for the key virtual machine, locking the first memory space reserved for the key virtual machine;
the virtual machine running module is used for: operating the key virtual machine by adopting the first memory space reserved for the key virtual machine; and running the virtual machines except the key virtual machine in all the virtual machines by adopting the memory space except the first memory space in the memory space reserved for all the virtual machines running on the host machine of the virtual machine.
6. The apparatus of claim 5, further comprising: a key virtual machine identification module that identifies a key virtual machine,
the virtual machine identification module is used for: before starting the virtual machine, identifying a key virtual machine according to the setting of the user on the virtual machine and/or the identification of the virtual machine.
7. The apparatus of claim 5, further comprising: a second memory space module for storing a second memory space,
the second memory space module is configured to: after the memory reading module acquires memory spaces configured by a user and reserved for all virtual machines running on a host machine of the virtual machines, when receiving an instruction of adding a second memory space for a key virtual machine in all the virtual machines from the user during running of the virtual machines, unlocking a first memory space reserved for the key virtual machine; adding the second memory space to the first memory space reserved for the key virtual machine, wherein the first memory space and the second memory space are continuous on a virtual address;
the first memory lock module is further configured to: locking the first memory space and the second memory space as the memory space reserved for the key virtual machine;
the virtual machine running module is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
8. The apparatus of claim 5, further comprising a third memory space module,
the third memory space module is to: after the memory reading module acquires memory spaces configured by a user and reserved for all virtual machines running on a host machine of the virtual machines, when receiving an instruction of the user to reduce a third memory space for a key virtual machine among the all virtual machines when the virtual machines are running, unlocking a first memory space reserved for the key virtual machine; reducing the third memory space of the first memory space reserved for the key virtual machine;
the first memory lock module is further configured to: locking the memory space obtained by subtracting the third memory space from the first memory space as the memory space reserved for the key virtual machine;
the virtual machine running module is further configured to: and operating the key virtual machine by adopting a memory space reserved for the key virtual machine.
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| CN113377490A (en) * | 2020-03-10 | 2021-09-10 | 阿里巴巴集团控股有限公司 | Memory allocation method, device and system of virtual machine |
| CN113791873B (en) * | 2021-11-16 | 2022-12-30 | 统信软件技术有限公司 | Virtual machine creating method, computing device and storage medium |
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