CN1851675A - Processor high-speed data buffer memory reconfiguration method - Google Patents
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Abstract
The present invention realizes reconfiguration processor data cache, mapping it to fixed memory space, its primary function being to provide system-calling interface for reconfiguring processor data cache as cache type RAM, thereby to make original transparent processor cache to programmer became visible. The present invention can be used in variable general-purpose temporary memory which can provide larger area than register file.
Description
Technical field
The present invention relates to the optimisation technique field of operating system, relate to operating system storage architecture field, particularly relate to a kind of processor high-speed data buffer memory reconfiguration method.
Background technology
So-called processor cache is commonly referred to as second level cache, or External Cache.Be cache memory, be positioned at scale between CPU and the primary memory DRAM (Dynamic RAM) less but the very high storer of speed form by SRAM (static RAM) usually.Be used for depositing those by the frequent data of using of CPU, so that make CPU needn't depend on slow DRAM (dynamic RAM).
Processor cache is prior to internal memory and CPU swap data, so speed is very fast.L1 Cache (level cache) is a CPU ground floor high-speed cache.The capacity and the structure of built-in L1 high-speed cache are bigger to the performance impact of CPU, but cache memory forms by static RAM (SRAM), and structure is complicated, and under the CPU die area can not too big situation, the capacity of L1 level high-speed cache can not be done too greatly.The capacity of general L1 buffer memory is usually at 32-256KB.L2 Cache (L2 cache) is the second layer high-speed cache of CPU, divides inside and outside two kinds of chips.Inner chip L2 cache travelling speed is identical with dominant frequency, and outside L2 cache then has only half of dominant frequency.The L2 cache capacity also can influence the performance of CPU, and principle is to be the bigger the better, and the L2 buffer memory of present common desktop computer CPU is 512KB to the maximum, and the L2 high-speed cache with CPU reaches as high as 1MB-3MB on notebook, server and the workstation.
The basic thought of processor cache depends on " locality of quoting " exactly, and this can be divided into temporal locality and spatial locality.Spatial locality is meant that CPU at a time needs certain data, and next step just needs near its data so probably; Temporal locality be meant when the accessed mistake of certain data once after, do not cross and how long will be visited again.For application program, no matter be the locality phenomenon that instruction stream or data stream all can occur quoting.Therefore can be with a spot of SRAM as the buffer zone between CPU and the DRAM storage system, i.e. Cache system.Cache is also referred to as one-level Cache in the sheet.Because the clock frequency of high-grade processor is very high, in case the miss situation of one-level Cache occurs, performance will obviously worsen.The way of Cai Yonging is to add Cache outside processor chips more in this case, is called second-level cache.Second-level cache is actually the real buffering between CPU and the main memory.
If in temporal locality, use rational replacement policy just can improve the result of use of buffer memory greatly.And replacement policy will determine in the present buffer memory certain piece will by certain new replace.Certainly select a new piece to replace obsolete now of buffer memory at random, also can use the mode of what FIFO (First In FirstOut first in first out), LIFO (last in, first out for Last In First Out) and so on.But, above all modes all do not consider the reusable problem of piece.
Best strategy is to remove in the buffer memory not to be used the longest piece of time at present, also can state the piece of removing access times minimum (LRU, least Recently Used is recently minimum by the user) as.If a piece has not used for some time, that chance that looks that this piece is used again in the operation of this workspace is also just minimum, just should shift out.
The algorithm of this LRU is very much idealized, if really in buffer memory control, add the frequency of utilization function of checking each piece, so not only buffer memory design will be more complicated, and such inspection also will occupy the relative time, and cause the delay of operation when shifting out piece.Puppet-lru algorithm that the design of present most of buffer memorys all is to use is done mark with obsolete, when new piece will enter buffer memory, just replaces that maximum piece of mark.
But sometimes " piece " to be moved out of not be because no longer use, but buffer memory capacity is not much of that, is necessary for piece to be advanced and makes way, to satisfy the needs in work at present district.This situation is exactly a kind of at last among the Cache Miss, and " Capacity Miss (capacity disappearance) " has to exactly because the problem of capacity shifts out useful piece.
The XSBase27X development platform is based on Intel
High performance PXA27X processor also is equipped with built-in Linux.This platform has been realized powerful extendability and the performance that can test the PXA27X peripherals overwhelming majority by various interface.
This platform passes through Intel
The PXA27X processor has been realized high-performance and minimum power consumption, so it is fit to do mobile device very much.The linux kernel that this platform is equipped with is up-to-date 2.6.11 version, and this operating system generally acknowledges it is the most reliable and the most stable system, the user can be in stable environment working procedure, and can from the Linux stability of network, obtain benefited.Application program can be moved in the environment that does not have External memory equipment such as hard disk.The MTD mode flash memory file system (JFFS2) that adopts provides the utilization factor and the reliability service of maximum capacity.On stream, the various expansion interfaces of PXA 27X processor provide great extendability and convenience.
XScale nuclear is the processor that adopts ARM V5TE framework, is the upgraded product of the StrongARM of Intel Company.It has characteristics such as high-performance, low-power consumption, but, it with the form of nuclear as the member (building block) of ASSP (Application specific Standard Productor).PXA250 and PXA210 application processor are exactly the ASSP as the portable equipment design.And adopt first application processor of XScale nuclear is 80200 of Intel, uses as I/O.
Summary of the invention
The object of the present invention is to provide a kind of processor high-speed data buffer memory reconfiguration method.
The technical scheme that the present invention solves its technical matters employing is as follows:
1) carries out exchanges data with processor high-speed data buffer memory behavior allocation units processor high-speed data buffer memory with behavior elementary cell and internal memory, data to internal memory are carried out buffer memory, so data cache is reshuffled the buffer memory type random access memory of formation also with the capable elementary cell as allocation of space of processor high-speed data buffer memory;
2) providing the reconfiguration system calling interface is that built-in Linux operating system adds the system call that processor high-speed data buffer memory is reshuffled, and reshuffles the interface of data cache as the programmer;
3) determine to reshuffle the data cache size, distribute equal size internal memory space because the access features of processor high speed buffer memory and internal memory, when determining that reshuffling the data cache size will be configured to the memory headroom of buffer memory type random access memory with distribution, two principle is arranged:
I. determine to reshuffle the data cache size, because processor high-speed data buffer memory carries out exchanges data with behavior elementary cell and internal memory, data to internal memory are carried out buffer memory, so the data cache size of reshuffling must be with the behavior elementary cell of data cache;
II. storage allocation space, because the restriction of bus bandwidth, internal storage data with the bus bandwidth be the unit when aliging efficient will improve, so, the memory headroom that will the be configured to buffer memory type random access memory distribution of should aliging with the line width higher value between the two of bus bandwidth and data cache;
4) reconfiguration process device data cache
Reconfiguration process device data cache need carry out following steps:
I. obtain the internal memory start address that will be configured to buffer memory type random access memory;
II. locks processor data cache;
III. the distribution processor data cache is capable;
IV. remove the processor high-speed data buffer memory lock.
The present invention compares with background technology, and the useful effect that has is:
The present invention is a kind of method that processor high-speed data buffer memory is a buffer memory type random access memory that reconfigures in the built-in Linux operating system based on PXA 27X, its major function is to provide the developer system to reconfigure the system call interfaces that processor high-speed data buffer memory is a buffer memory type random access memory as required in operating system grade, originally becomes visible to programmer's transparent treated device buffer memory thereby make.Can be used for variable temporary (Scratch) storer commonly used, it can provide the zone bigger than register file.
(1) make the programmer can the Operation Processor data cache.Thereby the programmer can reside among the buffer memory type random access memory frequently-used data in the program by explicitly, promptly among processor high-speed data buffer memory, needn't just be loaded into processor high-speed data buffer memory when needed.
(2) access speed of variable commonly used in the significantly raising program.System can allow variable commonly used resides among the buffer memory type random access memory in the program, thereby can not be replaced out processor high-speed data buffer memory.Therefore can effectively reduce the cold start-up mismatch of these frequent data item visits, thereby improve the speed of data access.
Description of drawings
Accompanying drawing is an overview flow chart of the present invention.
Embodiment
The specific implementation flow process of processor high-speed data buffer memory reconfiguration method is as follows.
The first step: with processor high-speed data buffer memory behavior allocation units.
Processor high-speed data buffer memory carries out exchanges data with behavior elementary cell and internal memory, data to internal memory are carried out buffer memory, so data cache is reshuffled the buffer memory type random access memory of formation also with the capable elementary cell as allocation of space of processor high-speed data buffer memory.
The D-Cache of XScale is the 32K byte, adopts the image mode of 32 road set associatives, promptly is divided into 32 groups, and every group has 32 the tunnel, every behavior 32 bytes and 1 significance bit.In addition, every row also comprises 2 " dirty " (dirty) position, illustrates respectively whether low 16 bytes and high 16 bytes were rewritten.When visit Cache hit, rose the dirty position of corresponding hemistich (16 byte).So in the realization based on the processor high-speed data buffer memory reconfiguration method of the built-in Linux operating system of PXA 27X, the basic allocation unit size of system is 32 bytes.
Second step: the reconfiguration system calling interface is provided.
For built-in Linux operating system adds the system call that processor high-speed data buffer memory is reshuffled, reshuffle the interface of data cache as the programmer.
Want add-on system to call at first will to select one and existing system to call the system call title of not conflicting, i.e. interface name.Then select or add a still untapped system call number, add-on system calls list item in subsystem call table then.The 3rd step: determine to reshuffle the data cache size, distribute equal size internal memory space.
Because the access features of processor high speed buffer memory and internal memory when determining that reshuffling the data cache size will be configured to the memory headroom of buffer memory type random access memory with distribution, has two principle:
I. determine to reshuffle the data cache size.Because processor high-speed data buffer memory carries out exchanges data with behavior elementary cell and internal memory, the data of internal memory is carried out buffer memory, so the data cache size of reshuffling must be with the behavior elementary cell of data cache.In the realization based on the processor high-speed data buffer memory reconfiguration method of the built-in Linux operating system of PXA 27X, the memory headroom size of the buffer memory type that will the be configured to random access memory of system assignment is necessary for the integral multiple of 32 bytes.
II. storage allocation space, because the restriction of bus bandwidth, internal storage data with the bus bandwidth be the unit when aliging efficient will improve, so, the memory headroom that will the be configured to buffer memory type random access memory distribution of should aliging with the line width higher value between the two of bus bandwidth and data cache.
The 4th step: reconfiguration process device data cache.
The XScale microstructure has adopted associations such as CP15 (MMU control), CP14 (performance monitoring) and CPO (DSP processing) to handle.Compare with general A RM framework, increased CP14 and CP coprocessor, and CP15 has also increased new function.
The Data Cache reconstruct of Xscale realizes by the latching operation of the Data Cache of the register 9 of CP15 coprocessor (being used for MMU control).
Reconfiguration process device data cache need carry out following steps:
I. obtain the internal memory start address and the space size that will be configured to buffer memory type random access memory.
Because the operation to coprocessor CP15 belongs to privileged operation, only allow to carry out, enter the kernel state space from the transmission of user's state space so system will be configured to the start address of the memory headroom of buffer memory type random access memory by register in the operating system nucleus attitude.
II. locks processor data cache.
Should forbid that in the capable assigning process of processor high-speed data buffer memory other manipulate data cache, so before cache lines is distributed beginning, the system lock processor high-speed data buffer memory.Before the locks processor data cache, need the access of hanging in the emptying metadata cache.
III. the distribution processor data cache is capable.
The size in Pei Zhi buffer memory type random access memory space distributes the processor high-speed data buffer memory of identical size capable as required.And it is capable that pre-assigned memory headroom is mapped to processor high-speed data buffer memory, and therefore, the programmer can be as using common memory to use buffer memory type random access memory space in program.
IV. remove the processor high-speed data buffer memory lock.
Processor high-speed data buffer memory is capable assigned after, the processor high-speed data buffer memory latch-release.Before release, need the access of hanging in the emptying metadata cache.
Claims (1)
1. processor high-speed data buffer memory reconfiguration method is characterized in that:
1) with processor high-speed data buffer memory behavior allocation units
Processor high-speed data buffer memory carries out exchanges data with behavior elementary cell and internal memory, data to internal memory are carried out buffer memory, so data cache is reshuffled the buffer memory type random access memory of formation also with the capable elementary cell as allocation of space of processor high-speed data buffer memory;
2) provide the reconfiguration system calling interface
For built-in Linux operating system adds the system call that processor high-speed data buffer memory is reshuffled, reshuffle the interface of data cache as the programmer;
3) determine to reshuffle the data cache size, distribute equal size internal memory space
Because the access features of processor high speed buffer memory and internal memory when determining that reshuffling the data cache size will be configured to the memory headroom of buffer memory type random access memory with distribution, has two principle:
I. determine to reshuffle the data cache size, because processor high-speed data buffer memory carries out exchanges data with behavior elementary cell and internal memory, data to internal memory are carried out buffer memory, so the data cache size of reshuffling must be with the behavior elementary cell of data cache;
II. storage allocation space, because the restriction of bus bandwidth, internal storage data with the bus bandwidth be the unit when aliging efficient will improve, so, the memory headroom that will the be configured to buffer memory type random access memory distribution of should aliging with the line width higher value between the two of bus bandwidth and data cache;
4) reconfiguration process device data cache
Reconfiguration process device data cache need carry out following steps:
I. obtain the internal memory start address that will be configured to buffer memory type random access memory;
II. locks processor data cache;
III. the distribution processor data cache is capable;
IV. remove the processor high-speed data buffer memory lock.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009082887A1 (en) * | 2007-12-29 | 2009-07-09 | Hangzhou H3C Technologies Co., Ltd. | Content searching method, system and engine distribution unit |
| CN101162440B (en) * | 2007-11-20 | 2010-06-30 | 杭州中天微系统有限公司 | Design method for built-in processor high speed on-line download straight-through channel |
| CN101989236A (en) * | 2010-11-04 | 2011-03-23 | 浙江大学 | Method for realizing instruction buffer lock |
| CN102063303A (en) * | 2010-12-22 | 2011-05-18 | 浙大网新科技股份有限公司 | Method for supporting kdata page of WinCE/WM by Linux kernel |
| CN107771322A (en) * | 2015-05-14 | 2018-03-06 | 赛灵思公司 | The management of memory resource in programmable integrated circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69715203T2 (en) * | 1997-10-10 | 2003-07-31 | Bull S.A., Louveciennes | A data processing system with cc-NUMA (cache coherent, non-uniform memory access) architecture and cache memory contained in local memory for remote access |
| TW451132B (en) * | 1998-12-15 | 2001-08-21 | Nippon Electric Co | System and method for cache processing |
| CN1267824C (en) * | 2003-02-13 | 2006-08-02 | 上海交通大学 | Digital signal processor with a reconfigurable cache |
| CN1746865A (en) * | 2005-10-13 | 2006-03-15 | 上海交通大学 | Method for realizing reconfiguration instruction cache part of digital signal processor |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162440B (en) * | 2007-11-20 | 2010-06-30 | 杭州中天微系统有限公司 | Design method for built-in processor high speed on-line download straight-through channel |
| WO2009082887A1 (en) * | 2007-12-29 | 2009-07-09 | Hangzhou H3C Technologies Co., Ltd. | Content searching method, system and engine distribution unit |
| CN101989236A (en) * | 2010-11-04 | 2011-03-23 | 浙江大学 | Method for realizing instruction buffer lock |
| CN101989236B (en) * | 2010-11-04 | 2012-05-09 | 浙江大学 | Method for realizing instruction buffer lock |
| CN102063303A (en) * | 2010-12-22 | 2011-05-18 | 浙大网新科技股份有限公司 | Method for supporting kdata page of WinCE/WM by Linux kernel |
| CN102063303B (en) * | 2010-12-22 | 2013-07-31 | 浙大网新科技股份有限公司 | Method for supporting kdata page of WinCE/WM by Linux kernel |
| CN107771322A (en) * | 2015-05-14 | 2018-03-06 | 赛灵思公司 | The management of memory resource in programmable integrated circuit |
| CN107771322B (en) * | 2015-05-14 | 2021-06-29 | 赛灵思公司 | Management of memory resources in programmable integrated circuits |
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