748e0d8ffb
背景：同一个进程的多个线程读写同一个PTE时，由于PTE无保护，存在竞态问题。 方案：新增spinlock保护PTE，包括大锁跟小锁。大锁：一个进程只有一个spinlock锁，多个线程 读写PTE时竞争一把锁，锁的内存占用小，但系统性能降低；小锁：每个页表持有一把spinlock， 由于锁是page结构体的一个字段，内存消耗较大，但是相对大锁性能较优。系统默认使用大锁,用 户可根据具体需要配置使用大锁还是小锁。 close #I2WARC Signed-off-by: Haryslee <lihao189@huawei.com> Change-Id: I5612eeac1f65507160035eae16af61f285182eda
73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __LOS_VM_PAGE_H__
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#define __LOS_VM_PAGE_H__
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#include "los_typedef.h"
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#include "los_bitmap.h"
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#include "los_list.h"
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#include "los_atomic.h"
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#include "los_spinlock.h"
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#ifdef __cplusplus
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#if __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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typedef struct VmPage {
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LOS_DL_LIST node; /**< vm object dl list */
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PADDR_T physAddr; /**< vm page physical addr */
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Atomic refCounts; /**< vm page ref count */
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UINT32 flags; /**< vm page flags */
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UINT8 order; /**< vm page in which order list */
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UINT8 segID; /**< the segment id of vm page */
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UINT16 nPages; /**< the vm page is used for kernel heap */
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#ifdef LOSCFG_PAGE_TABLE_FINE_LOCK
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SPIN_LOCK_S lock; /**< lock for page table entry */
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#endif
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} LosVmPage;
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extern LosVmPage *g_vmPageArray;
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extern size_t g_vmPageArraySize;
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LosVmPage *LOS_VmPageGet(PADDR_T paddr);
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VOID OsVmPageStartup(VOID);
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#ifdef __cplusplus
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#if __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* __cplusplus */
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#endif /* __LOS_VM_PAGE_H__ */
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