[Bug 95421] New: Outdated documentation on posix_fadvise?

[Bug 95421] New: Outdated documentation on posix_fadvise?

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=95421

            Bug ID: 95421
           Summary: Outdated documentation on posix_fadvise?
           Product: Documentation
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: man-pages
          Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
          Reporter: maik-pC6eOnvJXUcJGwgDXS7ZQA@public.gmane.org
        Regression: No

http://man7.org/linux/man-pages/man2/posix_fadvise.2.html suggests that
POSIX_FADV_DONTNEED has no effect on dirty pages. However, if I'm reading
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/mm/fadvise.c?id=v3.19#n115
correctly, it will in fact schedule dirty pages for writeout if the underlying
device is not already congested.

Can you please verify actual behavior and update the manpage if indicated?

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[Bug 95421] Outdated documentation on posix_fadvise?

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=95421

Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

--- Comment #1 from Michael Kerrisk <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> ---
(In reply to Maik Zumstrull from comment #0)
> http://man7.org/linux/man-pages/man2/posix_fadvise.2.html suggests that
> POSIX_FADV_DONTNEED has no effect on dirty pages.

I'm missing something. Where does the page suggest that?

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[Bug 95421] Outdated documentation on posix_fadvise?

[bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r]

https://bugzilla.kernel.org/show_bug.cgi?id=95421

--- Comment #2 from Maik Zumstrull <maik-pC6eOnvJXUcJGwgDXS7ZQA@public.gmane.org> ---
Last paragraph under NOTES. "Pages that have not yet been written out will be
unaffected, so if the application wishes to guarantee that pages will be
released, it should call fsync(2) or fdatasync(2) first."

Unless I'm misreading the code, this is not true.

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