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    Subjecthow do file-mapped (mmapped) pages become dirty?
    When a process mmaps a file, how does the kernel know the memory has been
    written to (and hence the page is dirty)? Is this done by setting the
    protected flag, and when the memory is first written to it's set to dirty?
    What function is responsible for this setting? And when will the page be
    written back to disk (i.e. where's the flusher located)?

    Thanks for any help,

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