Re: Convert namespace_sem to a mutex

[Satyam Sharma]

On 5/17/07, Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx> wrote:
> From: Bharata B Rao <bharata@xxxxxxxxxxxxxxxxxx>
>
> namespace_sem is a rwsem. It is acquired as read sem at only one place(used
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Actually, this ...

> by /proc/mounts, /proc/<pid>/mounts and /proc/<pid>/mountstats). In all other
> cases it is acquired as a write sem. So, as there is not more than one reader
                                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

... does not mean this. Multiple threads could be reading mounts or
mountstats, and otoh mount(2) and umount(2) (acquire it as write sem)
could be less frequent?

> for this sem, this can be a generic sem (and not rwsem) and if so it can be
> a mutex.
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