From: Matt Helsley <matthltc@us.ibm.com>
To: "John T. Kohl" <jtk@us.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>,
Peter Williams <pwil3058@bigpond.net.au>,
Linux-Kernel <linux-kernel@vger.kernel.org>,
Jes Sorensen <jes@sgi.com>,
LSE-Tech <lse-tech@lists.sourceforge.net>,
"Chandra S. Seetharaman" <sekharan@us.ibm.com>,
Alan Stern <stern@rowland.harvard.edu>,
Balbir Singh <balbir@in.ibm.com>,
Shailabh Nagar <nagar@watson.ibm.com>
Subject: Re: [PATCH] Per-task watchers: Enable inheritance
Date: Fri, 23 Jun 2006 16:33:04 -0700 [thread overview]
Message-ID: <1151105584.21787.1571.camel@stark> (raw)
In-Reply-To: <6c4pybmv19.fsf@sumu.lexma.ibm.com>
On Fri, 2006-06-23 at 17:17 -0400, John T. Kohl wrote:
> >>>>> "MattH" == <matthltc@us.ibm.com> writes:
>
> MattH> This allows per-task watchers to implement inheritance of the
> MattH> same function and/or data in response to the initialization of
> MattH> new tasks. A watcher might implement inheritance using the
> MattH> following notifier_call snippet:
>
> I think this would meet our needs--we (MVFS) need to initialize some new
> state in a child process based on our state in the parent process
> (essentially, module-private inherited per-process state). It may still
> be a bit clumsy to find the per-process state in other situations,
> though. While a process is executing our module's code, would it be
> safe to traverse current's notifier chain to find our state?
Hmm. We may need to be careful with terminology here. Keep in mind that
a task is not the same as the userspace concept of a "process".
When a task is executing a module's code it will be safe to traverse
the task's notifier chain to find state. It will *not* be safe to
traverse the notifier chain of other tasks -- even if the other task is
a thread in the same "process".
Cheers,
-Matt Helsley
next prev parent reply other threads:[~2006-06-23 23:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-21 8:47 [PATCH] Per-task watchers: Enable inheritance Matt Helsley
2006-06-21 10:30 ` Peter Williams
2006-06-21 21:27 ` Matt Helsley
2006-06-23 21:17 ` John T. Kohl
2006-06-23 23:33 ` Matt Helsley [this message]
2006-06-24 0:08 ` Peter Williams
2006-06-26 13:03 ` John T. Kohl
2006-06-26 13:27 ` Peter Williams
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