CN101901159B - Method and system for loading Linux operating system on multi-core CPU - Google Patents
Method and system for loading Linux operating system on multi-core CPU Download PDFInfo
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Abstract
The invention provides a method and a system for loading the Linux operating system on a multi-core CPU. The multi-core CPU comprises at least one control core and at least one data core. The method comprises: one of at least one control core is used as a primary core to load the Linux operating system and wakes up all secondary cores and makes all secondary cores enter a preset endless loop state in the initializing process; the primary core configures a CPU bitmap, which only comprises the control core; the primary core executes the symmetrical multi-processing initialization of the Linux operating system and executes the secondary wakeup of other control cores except the primary core in the symmetrical multi-processing mode when other control cores are included in the CPU bitmap besides the primary core; and the primary core makes each data core enter a respective entry function. By using the system, when the Linux operating system is loaded onto the multi-core CPU, the control cores and the data cores are not interfered with each other after all CPUs are started.
Description
Technical field
The present invention relates to adopt the multi-core CPU field of (SuSE) Linux OS, particularly a kind of method and system of loading Linux operating system on multi-core CPU.
Background technology
The at present application of multi-core CPU is more and more extensive, and compared with traditional monokaryon CPU, multi-core CPU has stronger parallel processing capability, higher bulk density and lower power consumption.In this framework, the single copy of multi-core CPU operation system, the resources such as shared cache, internal memory, I/O bus.
The drive manner of (SuSE) Linux OS mainly contains three kinds at present: asymmetric multiprocessing (AMP, Asymmetric multiprocessing), symmetrical multiprocessing (SMP, Symmetric multiprocessing), mix multiprocessing (BMP, Bound multiprocessing).In the mode of asymmetric multiprocessing, one of each CPU core operation is the copy of operating system or same operating system independently.In the mode of symmetrical multiprocessing, by a CPU core that operating system unified management is all, process is not bound mutually with some particular core.Mix the mode of multiprocessing based on symmetrical multiprocessing, by a CPU core that operating system unified management is all, but process can be bound mutually with some particular core.
These three kinds of modes respectively have relative merits.Asymmetric multiprocessing is mainly used in traditional monokaryon CPU running environment, and a process always operates in same kernel, on multi-core CPU, easily causes a kernel or is not fully utilized, or being utilized excessively.Symmetrical multiprocessing is by the running status of operating system real-time monitoring system, and reasonable distribution resource between multinuclear, can be assigned on all kernels load equably, but may cause a part of system resource waste on process switching frequently.Mix multiprocessing and drawn the advantage of first two mode, on the (SuSE) Linux OS moving in symmetrical multiprocessing mode, by process, bind and can make process can only operate in same kernel.
The present inventor finds realizing in process of the present invention: in the field that adopts multi-core CPU, conventionally multinuclear is divided into and controls CPU and data CPU.Controlling CPU is when multiple CPU move (SuSE) Linux OS with SMP or BMP mode, for the treatment of more complicated business, and controls, safeguards, manages the CPU of whole operating system.Control CPU and move the process about system management aspect, support complete (SuSE) Linux OS, can process the business of all complexity, but poor-performing.Data CPU is only absorbed in data processing, emphasis be the performance of processing, require to process business as much as possible in certain hour, often only move a task.So focus on the data processing of performance for some, need to be put into the data core execution of getting on.Just to (SuSE) Linux OS, the loading on multi-core CPU has proposed 2 requirements for this:
1) resource such as shared drive, global data structures, API between all kernels;
2) controlling can not phase mutual interference between CPU, data CPU.
Above-mentioned requirements 1) can realize by SMP mode.Above-mentioned requirements 2) can realize by BMP mode in theory, adopt the mode of process and CPU binding, but when realizing, the mode of utilizing this BMP all processes need to be bound with CPU one by one, operate so very loaded down with trivial details, complicated, maintenance is got up also very difficult, and has reduced maintainability, portability and the availability of system.
Summary of the invention
The object of this invention is to provide a kind of method of improved loading Linux operating system on multi-core CPU, the method makes to control between core and data core and can not influence each other, and without all processes are bound with CPU one by one.
To achieve these goals, the invention provides a kind of method of loading Linux operating system on multi-core CPU, described multi-core CPU comprises: at least one controls core and at least one data core, wherein, comprises the steps:
Steps A, described at least one control in core one as main core loading Linux operating system, and in initialization procedure, wake up allly from core, make allly from core, to enter predetermined endless loop state;
Step B, described main core arranges CPU bitmap, in described CPU bitmap, only includes control core;
Step C, described main core is carried out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when described CPU bitmap comprises other control core except described main core, according to the mode of symmetrical multiprocessing, described other control core except main core is carried out to secondary and wake up;
Step D, described main core makes the each entrance function entering separately in described at least one data core.
Preferably, described method, wherein, after described step C, also comprises before described step D:
Described main core storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core;
Described main core configures respectively stack pointer, global pointer and the entrance function of each data core in described at least one data core.
Preferably, described method, wherein, after described step D, also comprises:
Step e, the each data core in described at least one data core loads predetermined business processing process.
Preferably, described method, wherein, after described step D, before described step e, also comprises:
Each data core in described at least one data core enters respectively entrance function separately, and after the entrance function entering separately, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
On the other hand, provide a kind of multi-core CPU system, wherein, comprising: at least one controls core and at least one data core, wherein, as the control core of main core, comprises:
The first processing module, for loading Linux operating system, and in initialization procedure, wakes up allly from core, makes allly from core, to enter predetermined endless loop state;
Bitmap arranges module, for CPU bitmap is set, makes to only include control core in described CPU bitmap;
The second processing module, for carrying out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when described CPU bitmap comprises other control core except described main core, according to the mode of symmetrical multiprocessing, described other control core except main core is carried out to secondary and wake up;
The 3rd processing module, for making each entrance function entering separately of described at least one data core.
Preferably, described multi-core CPU system, wherein, described the 3rd processing module also comprises:
Distribution module, for storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core CPU;
The first configuration module, for configuring stack pointer, global pointer and the entrance function of the described each data core of at least one data core.
Preferably, described multi-core CPU system, wherein, each the comprising in described at least one data core:
The 4th processing module, for loading predetermined business processing process.
Preferably, described multi-core CPU system, wherein, each in described at least one data core also comprises:
The second configuration module, after the entrance function entering separately, loads before predetermined business processing process, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
Technique effect of the present invention is:
By at main core loading Linux operating system, and wake first all entering from core endless loop state up, CPU bitmap is set, make to only include in CPU bitmap control core, like this when main core is carried out SMP initialization, only can wake other up with the mode secondary of SMP and control core, and can not have influence on data core; For data core, main core is realized secondary and is waken up by making each data core carry out entrance function separately.Like this, after all CPU start, all CPU only need load a (SuSE) Linux OS kernel, and can not influence each other between control core and data core, data nuclear energy is not subject to the unified management of (SuSE) Linux OS, but only moves the flow chart of data processing of self.Compared with existing BMP technology, method and system of the present invention, without all processes are bound with CPU one by one, have improved dirigibility, ease for use and the maintainability of linux system, and make the division between multinuclear also more clear.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the method for the loading Linux operating system on multi-core CPU of one embodiment of the invention;
Fig. 2 is in the method for loading Linux operating system on multi-core CPU of another embodiment of the present invention, the division schematic diagram of multi-core CPU;
Fig. 3 is the schematic flow sheet of the method for the loading Linux operating system on multi-core CPU of another embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Fig. 1 is the schematic flow sheet of the method for the loading Linux operating system on multi-core CPU of the embodiment of the present invention.Wherein, multi-core CPU comprises: at least one controls core and at least one data core; Data core, can comprise multiple CPU, and each CPU can set and only move a task, for processing fast predetermined a certain business.In the process of loading Linux operating system, main core is host CPU, is the CPU of first loading Linux operating system, completes main system configuration, initialization action, is responsible for waking up other CPU.From core from CPU, comprise the CPU except main core.As Fig. 1, the method for the loading Linux operating system on multi-core CPU of this embodiment comprises the steps:
Step 101, at least one controls in core one as main core loading Linux operating system, and in initialization procedure, wake up all from core, make allly from core, to enter predetermined endless loop state;
Step 102, main core arranges CPU bitmap, only includes control core in CPU bitmap; CPU bitmap is the situation in place that represents multi-core CPU by a variable, the corresponding CPU of a bit (bit) of this variable;
Step 103, main core is carried out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when CPU bitmap comprises other control core except main core, according to the mode of symmetrical multiprocessing, other control core except main core is carried out to secondary and wake up;
In this step, main core by according to the mode of SMP to the CPU loading Linux operating system comprising in CPU bitmap, owing to only comprising control core in CPU bitmap, main core is only recorded (SuSE) Linux OS to controlling core according to the mode of SMP, and data core still keeps original endless loop state;
Step 104, main core makes the each entrance function entering separately at least one data core.
The method of the embodiment of the present invention, at main core loading Linux operating system and wake up and enter from core endless loop state, by CPU bitmap is set, make only to comprise in CPU bitmap and control core and do not comprise data core, main like this core is being carried out after the SMP initialization of linux system, and when the CPU in CPU bitmap is loaded to Linux according to the mode of SMP, owing to only comprising control core in CPU bitmap, so CPU only can be to controlling core loading Linux operating system, (SuSE) Linux OS can only all control core of unified management, and cannot manage data core.And for data core, by making it enter corresponding entrance function, and then carry out secondary and wake up, data core enters after corresponding entrance function, can start predetermined business process.Like this, guaranteed that data core can realize data core and only move a task, a certain business of fast processing.Compared with existing BMP technology, method data core of the present invention is not subject to the unified management of Linux, thereby without all processes are bound with CPU one by one, improved dirigibility, ease for use and the maintainability of linux system, and made the division between multinuclear also more clear.
Preferably, in the method for the embodiment of the present invention, after step 103, before step 104, also comprise:
Described main core storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core;
Described main core configures respectively stack pointer, global pointer and the entrance function of each data core in described at least one data core.
Preferably, in the method for the embodiment of the present invention, after step 104, also comprise:
Step 105, the each data core in described at least one data core loads predetermined business processing process.
Preferably, in the method for the embodiment of the present invention, after step 104, before step 105, also comprise:
Each data core in described at least one data core enters respectively entrance function separately, and after the entrance function entering separately, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
With an object lesson, the method for the embodiment of the present invention is described below.In this example, take 4 core CPU shown in Fig. 2 as example.As Fig. 2, in this example, CPU0 and CPU1 are for controlling core; CPU2 and CPU3 are data core.It should be noted that, method of the present invention is not limited only to 4 core CPU shown in this example, and the principle of describing in the present invention and method can realize on the multi-core CPU of other check figures equally, on the multi-core CPU that is equally applicable to distribute with additive method.As Fig. 3, the method for the loading Linux operating system on multi-core CPU of this embodiment comprises the steps:
Particularly, controlling core CPU0 is host CPU as main core, loading Linux operating system, exemplarily, CPU0 is according to existing normal flow loading Linux operating system, in initialization procedure, wake first other up as the CPU from core so that enter the state of predetermined endless loop from core, these wait for that from core main core carries out secondary to them and wakes up follow-up start-up course.Then, main core arranges CPU bitmap, make only to comprise in bitmap to control core and control CPU, in this this example for only comprising CPU0 and CPU1.Exemplarily, main core arranges CPU bitmap by the (SuSE) Linux OS loading.CPU bitmap can not comprise whole control core, specifically comprises particularly which control core and arranged by (SuSE) Linux OS in CPU bitmap.CPU bitmap is used for representing by a variable situation in place of multi-core CPU, the corresponding CPU of a bit (bit) of this variable.The bit of CPU bitmap is for identifying the attribute of CPU.Exemplarily, CPU bitmap is binary variable, and each bit of variable is corresponding with a CPU, and the value of this bit identifies an attribute of corresponding CPU.The embodiment of the present invention is by CPU bitmap is set with which, while having guaranteed Linux process scheduling, and can be by the process scheduling of controlling CPU to data CPU.
Exemplarily, whether each bit in CPU bitmap cpu_possible_map supports hot plug for identifying corresponding CPU, as a certain CPU supports hot plug, the bit value that this CPU is corresponding is 1, otherwise, value is the situation in place that 0, CPU bitmap cpu_possible_map shows the CPU that supports hot plug in system; Each bit in CPU bitmap cpu_present_map is for identifying whether corresponding CPU is current inserts, as a certain CPU inserts, the bit value that in cpu_present_map, this CPU is corresponding is 1, otherwise, value is 0, this CPU bitmap cpu_present_map shows the situation in place of the current CPU having inserted, and the CPU having inserted can be in line states also can be in off-line state; Whether each bit in CPU bitmap cpu_oneline_map is in line states for identifying the corresponding CPU having inserted, the CPU having inserted as a certain is in line states, the bit value that in cpu_oneline_map, this CPU is corresponding is 1, otherwise, be 0, cpu_oneline_map is the subset of cpu_present_map, shows in the current CPU having inserted, the situation in place of online CPU.In this example, in above-mentioned three CPU bitmaps, all do not comprise data core.In CPU bitmap, specifically comprising which control core is arranged by (SuSE) Linux OS.For normal SMP flow process, there is not hot plug, after having started, the CPU bitmap of these three bitmap variable signs equates.Above-mentioned three CPU bitmaps just exemplarily, are not limited to the present invention.In other embodiments of the invention, when there is other CPU bitmap, the CPU bitmap of main core setting comprises all CPU bitmaps of existence.
Particularly, when control core CPU0 carries out SMP initialization, because changed CPU bitmap in step 301, so main core can only be seen other control core except main core, in this example, CPU0 can only see CPU1, and CPU0 wakes the SMP mode according to standard up CPU1 like this, the endless loop waiting status of breaking CPU1 in the first step, has made it the initialization of SMP.After CPU1 has started like this, will in SMP mode, move Linux together with CPU0.And now, the state that data core CPU2 and CPU3 still wait in endless loop.
Particularly, main core CPU0 storage allocation space, this memory headroom is for storehouse and global data district as data core CPU2 and CPU3.Configure respectively stack pointer, global pointer and the entrance function of each data core CPU2 and CPU3.The object of doing is like this to make data core Fen Li with the storehouse of controlling core, is no longer subject to the unified management of Linux.Thereby main core has been broken the endless loop of data core CPU2 and CPU3, make them enter entrance function separately, realized the secondary of data core has been waken up.
Particularly, data core CPU2 and CPU3 enter respectively entrance function separately, configure interruption, translation lookaside buffer (TLB) TLB, abnormality processing function of this core etc.; Finally start one process and load predetermined business processing process, exemplarily, by entering predetermined data processing function, start one process, this data processing function is an endless loop flow process often.
So far, all CPU start complete, meet following target completely: multi-core CPU loads same (SuSE) Linux OS kernel; Control CPU:CPU0 and CPU1 and move Linux in SMP mode; Data CPU:CPU2 and CPU3 move respectively a business process; Can sharing A PI between multi-core CPU, the resource such as data structure, internal memory; The process of controlling on CPU can not be dispatched on data CPU.
In sum, multi-core CPU utilizes after the method loading Linux operating system of the embodiment of the present invention, all CPU only need load a (SuSE) Linux OS kernel, CPU0 and CPU1 move Linux as controlling core in SMP mode, and CPU2 and CPU3 only move each self-corresponding data treatment progress as data core.Because data core is only moved a simple task, can there is not process context switching, thereby can increase significantly the processing energy of data CPU; Control between core, data core and can not influence each other, have respectively and oneself independently interrupt and abnormality processing flow process; Meanwhile, because the code chain of software view control core, data core is connected together, thereby can share the resources such as global data, internal memory, API, greatly improve the efficiency of code development.
The embodiment of the present invention also provides a kind of multi-core CPU system, comprising: at least one controls core and at least one data core, wherein, as the control core of main core, comprises:
The first processing module, for loading Linux operating system, and in initialization procedure, wake up all from core, make allly from core, to enter predetermined endless loop state;
Bitmap arranges module, for CPU bitmap is set, makes to only include control core in described CPU bitmap;
The second processing module, for carrying out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when described CPU bitmap comprises other control core except described main core, according to the mode of symmetrical multiprocessing, described other control core except main core is carried out to secondary and wake up;
The 3rd processing module, for making each entrance function entering separately of described at least one data core.
Preferably, described multi-core CPU system, wherein, described the 3rd processing module also comprises:
Distribution module, for storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core CPU;
The first configuration module, for configuring stack pointer, global pointer and the entrance function of the described each data core of at least one data core.
Preferably, described multi-core CPU system, wherein, each the comprising in described at least one data core:
The 4th processing module, for loading predetermined business processing process.
Preferably, described multi-core CPU system, wherein, each in described at least one data core also comprises:
The second configuration module, after the entrance function entering separately, loads before predetermined business processing process, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. a method for loading Linux operating system on multi-core CPU, described multi-core CPU comprises: at least one controls core and at least one data core, it is characterized in that, comprises the steps:
Steps A, described at least one control in core one as main core loading Linux operating system, and in initialization procedure, wake up allly from core, make allly from core, to enter predetermined endless loop state;
Step B, described main core arranges CPU bitmap, in described CPU bitmap, only includes control core;
Step C, described main core is carried out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when described CPU bitmap comprises other control core except described main core, according to the mode of symmetrical multiprocessing, other control core except described main core is carried out to secondary and wake up;
Step D, described main core makes the each entrance function entering separately in described at least one data core.
2. method according to claim 1, is characterized in that, after described step c, before described step D, also comprises:
Described main core storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core;
Described main core configures respectively stack pointer, global pointer and the entrance function of each data core in described at least one data core.
3. method according to claim 1 and 2, is characterized in that, after described step D, also comprises:
Step e, the each data core in described at least one data core loads predetermined business processing process.
4. method according to claim 3, is characterized in that, after described step D, before described step e, also comprises:
Each data core in described at least one data core enters respectively entrance function separately, and after the entrance function entering separately, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
5. a multi-core CPU system, is characterized in that, comprising: at least one controls core and at least one data core, wherein, described at least one control in core one the control core as main core and comprise:
The first processing module, for loading Linux operating system, and in initialization procedure, wakes up allly from core, makes allly from core, to enter predetermined endless loop state;
Bitmap arranges module, for CPU bitmap is set, makes to only include control core in described CPU bitmap;
The second processing module, for carrying out the symmetrical multiprocessing initialization of (SuSE) Linux OS, and when described CPU bitmap comprises other control core except described main core, according to the mode of symmetrical multiprocessing, other control core except described main core is carried out to secondary and wake up;
The 3rd processing module, for making each entrance function entering separately of described at least one data core.
6. multi-core CPU system according to claim 5, is characterized in that, described the 3rd processing module also comprises:
Distribution module, for storage allocation space, described memory headroom is for storehouse and global data district as described at least one data core CPU;
The first configuration module, for configuring stack pointer, global pointer and the entrance function of the described each data core of at least one data core.
7. according to the multi-core CPU system described in claim 5 or 6, it is characterized in that each the comprising in described at least one data core:
The 4th processing module, for loading predetermined business processing process.
8. multi-core CPU system according to claim 7, is characterized in that, each in described at least one data core also comprises:
The second configuration module, after the entrance function entering separately, loads before predetermined business processing process, configures interruption, translation lookaside buffer (TLB) and/or the abnormality processing function of this core.
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| CN201010244460.0A CN101901159B (en) | 2010-08-03 | 2010-08-03 | Method and system for loading Linux operating system on multi-core CPU |
| PCT/CN2011/074713 WO2012016472A1 (en) | 2010-08-03 | 2011-05-26 | Method and system for loading linux operating system in multicore central processing unit (cpu) |
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| CN101901159B (en) * | 2010-08-03 | 2014-04-30 | 中兴通讯股份有限公司 | Method and system for loading Linux operating system on multi-core CPU |
| CN106155730A (en) * | 2015-04-21 | 2016-11-23 | 北京信威通信技术股份有限公司 | Operating system loading method and device |
| CN104793996A (en) * | 2015-04-29 | 2015-07-22 | 中芯睿智（北京）微电子科技有限公司 | Task scheduling method and device of parallel computing equipment |
| CN106484632A (en) * | 2015-09-01 | 2017-03-08 | 华耀(中国)科技有限公司 | The method distributing continuous physical memory in linux system user's space |
| CN106126241A (en) * | 2016-06-29 | 2016-11-16 | 上海友衷科技有限公司 | A kind of linux system starts method and system |
| CN106254134A (en) * | 2016-08-29 | 2016-12-21 | 上海斐讯数据通信技术有限公司 | A kind of network equipment and the method that data are flow to line pipe control thereof |
| CN109101283A (en) * | 2018-07-17 | 2018-12-28 | 北京元心科技有限公司 | Control method, device and the electronic equipment of GPU equipment |
| CN114489826B (en) * | 2020-11-09 | 2024-06-04 | 哲库科技(上海)有限公司 | Chip operation method and device, storage medium and electronic equipment |
| CN112463342A (en) * | 2020-12-14 | 2021-03-09 | 北京四方继保工程技术有限公司 | Platform architecture design method for multi-core CPU operation mode |
| CN113391821B (en) * | 2021-05-11 | 2023-03-10 | 中国电力科学研究院有限公司 | Asymmetric multiprocessor embedded operating system |
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| CN101246431B (en) * | 2008-03-10 | 2010-08-18 | 中兴通讯股份有限公司 | Management method for loading multi-core different operating system images |
| CN101901159B (en) * | 2010-08-03 | 2014-04-30 | 中兴通讯股份有限公司 | Method and system for loading Linux operating system on multi-core CPU |
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| CN1828573A (en) * | 2005-03-01 | 2006-09-06 | 华为技术有限公司 | Multiple-CPU system and its control method |
| CN101256512A (en) * | 2008-03-20 | 2008-09-03 | 中兴通讯股份有限公司 | Method for automatically electing main guiding nucleus in isomerization multi-nucleus architecture |
| CN101770401A (en) * | 2008-12-30 | 2010-07-07 | 北京天融信网络安全技术有限公司 | Method for building multi-core operating environment |
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