Re: a question of mmap() of files into memory

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Peter Teoh wrote:
when a process mmap() a section of a file into its own process memory,
the process memory will maintain a copy of the data of that section of
the file.

No, it does not maintain a copy.

It mmaps the page cache pages into its own address space.

so...does there exists duplicated buffering?   (one in kernel -
pagecache, and one in userspace - for mmap() content of the file in
process memory)

No, there is no such double buffering.

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