linux-kernel - Re: [Patch 0/7] Per cpu thread hotplug infrastructure

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Message-ID: <20120716152224.GF2403@linux.vnet.ibm.com>
Date:	Mon, 16 Jul 2012 08:22:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [Patch 0/7] Per cpu thread hotplug infrastructure - V3

On Mon, Jul 16, 2012 at 10:42:34AM -0000, Thomas Gleixner wrote:
> The following series implements the infrastructure for parking and
> unparking kernel threads to avoid the full teardown and fork on cpu
> hotplug operations along with management infrastructure for hotplug
> and users.
> 
> Changes vs. V2:
> 
>  Use callbacks for all functionality. Thanks to Rusty for pointing
>  that out. It makes the use sites nice and simple and keeps all the
>  code which would be duplicated otherwise on the core.

Hello, Thomas,

What version should I apply this patchset to?  I tried v3.5-rc7, but
got lots of warnings (one shown below) and the watchdog patch did not
apply.

							Thanx, Paul

------------------------------------------------------------------------

[    0.280196] BUG: scheduling while atomic: ksoftirqd/1/7/0x00000004
[    0.280968] Modules linked in:
[    0.282064] Pid: 7, comm: ksoftirqd/1 Not tainted 3.5.0-rc7+ #1559
[    0.283990] Call Trace:
[    0.284987]  [<c16314f1>] __schedule_bug+0x49/0x55
[    0.285975]  [<c1638e1a>] __schedule+0x6ca/0x780
[    0.286977]  [<c109b556>] ? rcu_process_callbacks+0x66/0x130
[    0.288983]  [<c10362c4>] ? __local_bh_enable+0x24/0x70
[    0.289975]  [<c105f02b>] ? default_wake_function+0xb/0x10
[    0.291972]  [<c1638fbe>] schedule+0x1e/0x50
[    0.292969]  [<c1639202>] schedule_preempt_disabled+0x12/0x20
[    0.294975]  [<c1075ff8>] smpboot_thread_fn+0xe8/0x240
[    0.295968]  [<c1075f10>] ? smpboot_register_percpu_thread+0xc0/0xc0
[    0.295969]  [<c104fe5f>] kthread+0x8f/0xa0
[    0.295969]  [<c104fdd0>] ? flush_kthread_worker+0x80/0x80
[    0.295969]  [<c163ffb6>] kernel_thread_helper+0x6/0xd

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