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

    Yes, I only use original V3.18.136 to test. Because system run very slowly, I give up.

    Device: NUC (made in 2017)
    OS: ubuntu 16.04
    Kernel: V3.18.136 (come from https://kernel.ubuntu.com/~kernel-ppa/mainline/v3.18.136/)
    System can boot, but run very slowly, and couldn't connect the network.
    This make me not to work with terminal, because system very slowly.
    So I don’t use V3.18.136+patch to test.


    -----Original Message-----
    From: Paul E. McKenney [mailto:paulmck@linux.ibm.com]
    Sent: Wednesday, March 27, 2019 23:10
    To: Zhang, Jun <jun.zhang@intel.com>
    Cc: He, Bo <bo.he@intel.com>; Greg Kroah-Hartman <gregkh@linuxfoundation.org>; linux-kernel@vger.kernel.org; stable@vger.kernel.org; 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

    Hello, Jun,

    Do you see the same hang without the patch?

    Thanx, Paul

    On Wed, Mar 27, 2019 at 01:50:57AM +0000, Zhang, Jun wrote:
    > 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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