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if multiple processes are accessing a file through mmap. then they are accessing the same bits in physical memory. without system calls. their page table entries are marked as dirty and ... . that is what i understand from your answer

Rohit Banga
– Rohit Banga

2009-11-18 08:59:51 +00:00
Commented Nov 18, 2009 at 8:59
Different processes can share the same memory. You can have shared access, so writes by one process will be seen by other processes, or you can use copy-on-write where a process gets an individual copy of a page as soon as they start writing to it.

Aaron Digulla
– Aaron Digulla

2009-11-18 12:51:02 +00:00
Commented Nov 18, 2009 at 12:51

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