Messages in this thread | | | Date | Thu, 17 May 2007 10:30:29 +0530 | From | "Satyam Sharma" <> | Subject | Re: Convert namespace_sem to a mutex |
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On 5/17/07, Bharata B Rao <bharata@linux.vnet.ibm.com> wrote: > From: Bharata B Rao <bharata@linux.vnet.ibm.com> > > 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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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