On 5/17/07, Bharata B Rao <[email protected]> wrote:
From: Bharata B Rao <[email protected]>
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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