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I. Virtual Memory
First, let's look at a figure (from the Linux kernel full analysis), as shown below:
Segmentation: it is divided into code segments, data segments, and stack segments. Each memory segment is associated with a privileged level, that is, 0 ~ 3. 0 has the highest privilege level (kernel), and 3 is the lowest privilege level (User). Whenever a program tries to access a segment (which is divided into readable, writable, and executable p
which require memory from non-bpool region will fail.
When a time, these problems go away automatically without any action taken. this indicates an intermittent problem when at a certain point in time; there was virtual memory pressure which resulted in abve messages being printed to the SQL errorlog.
Dealing with vas fragmentation or running out of VAS on SQL Server 2000 was rather painful and required setting up additional Debugging techniques to g
share . Mmap is a system function, you can map a portion of a disk file directly to memory, so that the location of the file directly has a corresponding memory address, read and write to the file can be done directly with pointers do not need to read/write function. In addition, calling malloc when normal is called BRK system call allocates memory, under certain conditions is called Mmap to map physical memory to the process
http://blog.csdn.net/xu3737284/article/details/12710217The address space of a process in a Linux operating system on a 32-bit machine is 4G, where 0-3g is the user space and 3g-4g is the kernel space. The address space of the process exists in virtual memory. Virtual memory cannot be disabled.Process
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Memory Layout (Virtual address space of a C process)Category: C language Foundation 2012-12-06 23:16 2174 people read reviews (0) favorite reports Found a good example to demostrate the memory layout and its stack info of a user-mode process, only that this example is For Linux. But it's still worth taking a look at it.C source file is quite simple:[CPP]View Plaincopyprint?
void func (int x, in
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