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SubjectRE: [PATCH 3.18 132/134] rcu: Do RCU GP kthread self-wakeup from softirq and interrupt
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Hello,Paul

I use a new NUC (made in 2017) to test, meet the same hang. System run very slowly.

But I use my PC (made before 2015), test V3.18.136+ patch for 12 hours, still well.

Maybe V3.18.y don't support some new devices.


-----Original Message-----
From: Paul E. McKenney [mailto:paulmck@linux.ibm.com]
Sent: Tuesday, March 26, 2019 23:56
To: He, Bo <bo.he@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>; linux-kernel@vger.kernel.org; stable@vger.kernel.org; Zhang, Jun <jun.zhang@intel.com>; Xiao, Jin <jin.xiao@intel.com>; Bai, Jie A <jie.a.bai@intel.com>
Subject: Re: [PATCH 3.18 132/134] rcu: Do RCU GP kthread self-wakeup from softirq and interrupt

On Tue, Mar 26, 2019 at 08:43:45AM +0000, He, Bo wrote:
> Hi, Paul:
> I have tried on my PC and not hit any hang issue with RCU torture test for one hour, the configurations are like:
> OS: ubuntu 16.04
> kenrel: 3.18.136 + 3.18 rcu patch
> CPU: Intel(R) Xeon(R) CPU E3-1225 V2 @ 3.20GHz

Sounds good, please proceed!

Thanx, Paul

> -----Original Message-----
> From: Paul E. McKenney <paulmck@linux.ibm.com>
> Sent: Tuesday, March 26, 2019 12:00 AM
> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: He, Bo <bo.he@intel.com>; linux-kernel@vger.kernel.org;
> stable@vger.kernel.org; Zhang, Jun <jun.zhang@intel.com>; Xiao, Jin
> <jin.xiao@intel.com>; Bai, Jie A <jie.a.bai@intel.com>
> Subject: Re: [PATCH 3.18 132/134] rcu: Do RCU GP kthread self-wakeup
> from softirq and interrupt
>
> On Sat, Mar 23, 2019 at 07:33:15AM +0100, Greg Kroah-Hartman wrote:
> > On Fri, Mar 22, 2019 at 04:00:17PM +0000, He, Bo wrote:
> > > Hi, Greg:
> > > Can you hold on the 3.18-stable branch, it seems there are some issue, please see the comments from Paul:
> > >
> > > Comments from Paul:
> > > I subjected all of the others to light rcutorture testing, which
> > > they passed. This v3.18 patch hung, however. Trying it again
> > > with stock
> > > v3.18 got the same hang, so I believe we can exonerate the patch and give it a good firm "maybe" on 3.18.
> > >
> > > Worth paying special attention to further test results from 3.18.x, though!
> >
> > Ok, I've dropped this from the 3.18.y queue now, thanks.
>
> Bo, if you know of a "y" for 3.18.y that would likely pass rcutorture testing, please let me know.
>
> Thanx, Paul
>

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