Statecheck operation of checkpoint preserves the user register context and user data segment of process checkpointed at this time to checkpoint file.

检查点机制的状态检查操作就是将进程在该运行时刻的用户级寄存器上下文和用户数据段保存到检查点文件中。

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On 32-bit systems, the default address-space model is that it USES a single segment for user and stack data with a maximum aggregate size close to 256 MB.

在32位系统上，默认的地址空间模型是对于用户和堆栈数据使用单一数据段，最大总大小接近256 MB。

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The third segment (0x2) is used for user stack and data.

第3段(0x2)用于用户堆栈和数据。

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