Date: Mon, 28 Jan 2008 01:45:34 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Pavel Emelyanov <xemul@openvz.org>
Cc: Vinay Sridhar <vinay@linux.vnet.ibm.com>, linux-kernel@vger.kernel.org,
       libc-alpha@sourceware.org, drepper@redhat.com, wli@holomorphy.com,
       sripathik@in.ibm.com, "Eric W. Biederman" <ebiederm@xmission.com>
Subject: Re: [RFC] Per-thread getrusage
Message-Id: <20080128014534.17630ddd.akpm@linux-foundation.org>
In-Reply-To: <479DA289.7090403@openvz.org>
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	<20080127215242.b873c341.akpm@linux-foundation.org>
	<479D88C7.5030101@openvz.org>
	<20080128011010.d162d336.akpm@linux-foundation.org>
	<479DA289.7090403@openvz.org>
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On Mon, 28 Jan 2008 12:38:17 +0300 Pavel Emelyanov <xemul@openvz.org> wrote:

> > If the code was using find_task_by_vpid() then OK (I guess).  But it is
> 
> Yup, find_task_by_vpid() will find the proper (i.e. in your namespace) task.
> 
> > looking the tids up in the init_pid_ns.  Which I assume means that if it's
> > in a new namespace and is looking up a sibling thread it will simply fail?
> 
> If it looks in the init_pid_ns, then it can either fail or obtain a task 
> from different namespace. The find_task_by_pid_ns() was intended to be used
> in proc mainly, to get tasks from the namespace pointed by the super-block
> being explored.
> 
> Please excuse my lamentable ignorance, but which code does such things with
> init_pid_ns? I followed the 'per-thread rusage' thread and didn't find any.

From: Vinay Sridhar <vinay@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org, libc-alpha@sourceware.org
Cc: drepper@redhat.com, wli@holomorphy.com, akpm@linux-foundation.org, sripathik@in.ibm.com
Subject: [RFC] Per-thread getrusage
...
+asmlinkage long sys_thread_getrusage(int tid, struct rusage __user *ru)
+{
+	struct task_struct *tsk;
+	tsk = find_task_by_pid(tid);
+	return getrusage(tsk, RUSAGE_THREAD, ru);
+}


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