On Tue, Oct 27, 2020 at 03:31:41PM -0400, Qian Cai wrote:
> On Mon, 2020-10-12 at 11:11 +0800, Boqun Feng wrote:
> > Hi,
> >
> > On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > > The following commit has
On Wed, 2020-10-28 at 08:53 -0700, Paul E. McKenney wrote:
> On Wed, Oct 28, 2020 at 10:39:47AM -0400, Qian Cai wrote:
> > On Tue, 2020-10-27 at 20:01 -0700, Paul E. McKenney wrote:
> > > If I have the right email thread associated with the right fixes, these
> > > commits in -rcu should be what
On Wed, Oct 28, 2020 at 10:39:47AM -0400, Qian Cai wrote:
> On Tue, 2020-10-27 at 20:01 -0700, Paul E. McKenney wrote:
> > If I have the right email thread associated with the right fixes, these
> > commits in -rcu should be what you are looking for:
> >
> > 73b658b6b7d5 ("rcu: Prevent
On Tue, 2020-10-27 at 20:01 -0700, Paul E. McKenney wrote:
> If I have the right email thread associated with the right fixes, these
> commits in -rcu should be what you are looking for:
>
> 73b658b6b7d5 ("rcu: Prevent lockdep-RCU splats on lock acquisition/release")
> 626b79aa935a ("x86/smpboot:
On Wed, Oct 28, 2020 at 04:08:59PM -0400, Qian Cai wrote:
> On Wed, 2020-10-28 at 08:53 -0700, Paul E. McKenney wrote:
> > On Wed, Oct 28, 2020 at 10:39:47AM -0400, Qian Cai wrote:
> > > On Tue, 2020-10-27 at 20:01 -0700, Paul E. McKenney wrote:
> > > > If I have the right email thread associated
On Mon, 2020-10-12 at 11:11 +0800, Boqun Feng wrote:
> Hi,
>
> On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > The following commit has been merged into the locking/core branch of tip:
> > >
> > >
On Thu, Oct 15, 2020 at 09:15:01AM -0700, Paul E. McKenney wrote:
> On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 14, 2020 at 08:41:28PM -0700, Paul E. McKenney wrote:
[ . . . ]
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -1764,8 +1764,7 @@
On Thu, Oct 15, 2020 at 11:52:35AM +0200, Peter Zijlstra wrote:
> On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -1764,8 +1764,7 @@ static bool rcu_gp_init(void)
> > smp_mb(); // Pair with barriers used
On Thu, Oct 15, 2020 at 11:50:33AM +0200, Peter Zijlstra wrote:
> On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> > --- a/kernel/rcu/tree.c
> > +++ b/kernel/rcu/tree.c
> > @@ -1143,13 +1143,15 @@ bool rcu_lockdep_current_cpu_online(void
> > struct rcu_data *rdp;
> >
On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> On Wed, Oct 14, 2020 at 08:41:28PM -0700, Paul E. McKenney wrote:
> > So the (untested) patch below (on top of the other two) moves the delay
> > to rcu_gp_init(), in particular, to the first loop that traverses only
> > the leaf
On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1764,8 +1764,7 @@ static bool rcu_gp_init(void)
> smp_mb(); // Pair with barriers used when updating ->ofl_seq to
> odd values.
> firstseq =
On Thu, Oct 15, 2020 at 11:49:26AM +0200, Peter Zijlstra wrote:
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1143,13 +1143,15 @@ bool rcu_lockdep_current_cpu_online(void
> struct rcu_data *rdp;
> struct rcu_node *rnp;
> bool ret = false;
> + unsigned long seq;
>
On Wed, Oct 14, 2020 at 08:41:28PM -0700, Paul E. McKenney wrote:
> So the (untested) patch below (on top of the other two) moves the delay
> to rcu_gp_init(), in particular, to the first loop that traverses only
> the leaf rcu_node structures handling CPU hotplug.
>
> Hopefully getting closer!
On Wed, Oct 14, 2020 at 04:55:53PM -0700, Paul E. McKenney wrote:
> On Thu, Oct 15, 2020 at 12:39:54AM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 14, 2020 at 03:11:52PM -0700, Paul E. McKenney wrote:
> > > On Wed, Oct 14, 2020 at 11:53:19PM +0200, Peter Zijlstra wrote:
> > > > On Wed, Oct 14,
On Wed, Oct 14, 2020 at 03:11:52PM -0700, Paul E. McKenney wrote:
> On Wed, Oct 14, 2020 at 11:53:19PM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 14, 2020 at 11:34:05AM -0700, Paul E. McKenney wrote:
> > > commit 7deaa04b02298001426730ed0e6214ac20d1a1c1
> > > Author: Paul E. McKenney
> > >
On Wed, Oct 14, 2020 at 11:34:05AM -0700, Paul E. McKenney wrote:
> commit 7deaa04b02298001426730ed0e6214ac20d1a1c1
> Author: Paul E. McKenney
> Date: Tue Oct 13 12:39:23 2020 -0700
>
> rcu: Prevent lockdep-RCU splats on lock acquisition/release
>
> The rcu_cpu_starting() and
On Thu, Oct 15, 2020 at 12:39:54AM +0200, Peter Zijlstra wrote:
> On Wed, Oct 14, 2020 at 03:11:52PM -0700, Paul E. McKenney wrote:
> > On Wed, Oct 14, 2020 at 11:53:19PM +0200, Peter Zijlstra wrote:
> > > On Wed, Oct 14, 2020 at 11:34:05AM -0700, Paul E. McKenney wrote:
> > > > commit
On Wed, Oct 14, 2020 at 11:53:19PM +0200, Peter Zijlstra wrote:
> On Wed, Oct 14, 2020 at 11:34:05AM -0700, Paul E. McKenney wrote:
> > commit 7deaa04b02298001426730ed0e6214ac20d1a1c1
> > Author: Paul E. McKenney
> > Date: Tue Oct 13 12:39:23 2020 -0700
> >
> > rcu: Prevent lockdep-RCU
On Tue, Oct 13, 2020 at 12:30:25PM -0700, Paul E. McKenney wrote:
> On Tue, Oct 13, 2020 at 09:26:50AM -0700, Paul E. McKenney wrote:
> > On Tue, Oct 13, 2020 at 01:25:44PM +0200, Peter Zijlstra wrote:
> > > On Tue, Oct 13, 2020 at 12:44:50PM +0200, Peter Zijlstra wrote:
> > > > On Tue, Oct 13,
On Tue, Oct 13, 2020 at 09:26:50AM -0700, Paul E. McKenney wrote:
> On Tue, Oct 13, 2020 at 01:25:44PM +0200, Peter Zijlstra wrote:
> > On Tue, Oct 13, 2020 at 12:44:50PM +0200, Peter Zijlstra wrote:
> > > On Tue, Oct 13, 2020 at 12:34:06PM +0200, Peter Zijlstra wrote:
> > > > On Mon, Oct 12, 2020
On Tue, Oct 13, 2020 at 01:25:44PM +0200, Peter Zijlstra wrote:
> On Tue, Oct 13, 2020 at 12:44:50PM +0200, Peter Zijlstra wrote:
> > On Tue, Oct 13, 2020 at 12:34:06PM +0200, Peter Zijlstra wrote:
> > > On Mon, Oct 12, 2020 at 02:28:12PM -0700, Paul E. McKenney wrote:
> > > > It is certainly an
On Tue, Oct 13, 2020 at 12:27:15PM +0200, Peter Zijlstra wrote:
> On Mon, Oct 12, 2020 at 11:11:10AM +0800, Boqun Feng wrote:
>
> > I think this happened because in this commit debug_lockdep_rcu_enabled()
> > didn't adopt to the change that made lockdep_recursion a percpu
> > variable?
> >
> >
On Tue, Oct 13, 2020 at 12:44:50PM +0200, Peter Zijlstra wrote:
> On Tue, Oct 13, 2020 at 12:34:06PM +0200, Peter Zijlstra wrote:
> > On Mon, Oct 12, 2020 at 02:28:12PM -0700, Paul E. McKenney wrote:
> > > It is certainly an accident waiting to happen. Would something like
> > > the following
On Tue, Oct 13, 2020 at 12:44:50PM +0200, Peter Zijlstra wrote:
> On Tue, Oct 13, 2020 at 12:34:06PM +0200, Peter Zijlstra wrote:
> > On Mon, Oct 12, 2020 at 02:28:12PM -0700, Paul E. McKenney wrote:
> > > It is certainly an accident waiting to happen. Would something like
> > > the following
On Tue, Oct 13, 2020 at 12:34:06PM +0200, Peter Zijlstra wrote:
> On Mon, Oct 12, 2020 at 02:28:12PM -0700, Paul E. McKenney wrote:
> > It is certainly an accident waiting to happen. Would something like
> > the following make sense?
>
> Sadly no.
>
> >
On Mon, Oct 12, 2020 at 02:28:12PM -0700, Paul E. McKenney wrote:
> It is certainly an accident waiting to happen. Would something like
> the following make sense?
Sadly no.
>
>
> diff --git a/kernel/rcu/tree.c
On Mon, Oct 12, 2020 at 11:11:10AM +0800, Boqun Feng wrote:
> I think this happened because in this commit debug_lockdep_rcu_enabled()
> didn't adopt to the change that made lockdep_recursion a percpu
> variable?
>
> Qian, mind to try the following?
>
> Although, arguably the problem still
On Mon, Oct 12, 2020 at 11:11:10AM +0800, Boqun Feng wrote:
> Hi,
>
> On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > The following commit has been merged into the locking/core branch of tip:
> > >
> > >
On Mon, 2020-10-12 at 11:11 +0800, Boqun Feng wrote:
> Hi,
>
> On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > The following commit has been merged into the locking/core branch of tip:
> > >
> > >
Hi,
On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > The following commit has been merged into the locking/core branch of tip:
> >
> > Commit-ID: 4d004099a668c41522242aa146a38cc4eb59cb1e
> > Gitweb:
On Fri, Oct 09, 2020 at 01:54:34PM -0400, Qian Cai wrote:
> On Fri, 2020-10-09 at 13:36 -0400, Qian Cai wrote:
> > Back to x86, we have:
> >
> > start_secondary()
> > smp_callin()
> > apic_ap_setup()
> > setup_local_APIC()
> > printk() in certain conditions.
> >
> > which is
On Fri, 2020-10-09 at 13:36 -0400, Qian Cai wrote:
> Back to x86, we have:
>
> start_secondary()
> smp_callin()
> apic_ap_setup()
> setup_local_APIC()
> printk() in certain conditions.
>
> which is before smp_store_cpu_info().
>
> Can't we add a rcu_cpu_starting() at the
On Fri, Oct 09, 2020 at 01:36:47PM -0400, Qian Cai wrote:
> On Fri, 2020-10-09 at 18:23 +0200, Peter Zijlstra wrote:
> > On Fri, Oct 09, 2020 at 06:58:37AM -0700, Paul E. McKenney wrote:
> > > On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > > > On Fri, 2020-10-09 at 07:58 +,
On Fri, 2020-10-09 at 18:23 +0200, Peter Zijlstra wrote:
> On Fri, Oct 09, 2020 at 06:58:37AM -0700, Paul E. McKenney wrote:
> > On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > > The following commit has
On Fri, Oct 09, 2020 at 06:23:52PM +0200, Peter Zijlstra wrote:
> On Fri, Oct 09, 2020 at 06:58:37AM -0700, Paul E. McKenney wrote:
> > On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > > The following commit
On Fri, Oct 09, 2020 at 06:58:37AM -0700, Paul E. McKenney wrote:
> On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > The following commit has been merged into the locking/core branch of tip:
> > >
> > >
On Fri, Oct 09, 2020 at 11:30:38AM -0400, Qian Cai wrote:
> On Fri, 2020-10-09 at 06:58 -0700, Paul E. McKenney wrote:
> > On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > > The following commit has been
On Fri, 2020-10-09 at 06:58 -0700, Paul E. McKenney wrote:
> On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> > On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > > The following commit has been merged into the locking/core branch of tip:
> > >
> > > Commit-ID:
On Fri, Oct 09, 2020 at 09:41:24AM -0400, Qian Cai wrote:
> On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> > The following commit has been merged into the locking/core branch of tip:
> >
> > Commit-ID: 4d004099a668c41522242aa146a38cc4eb59cb1e
> > Gitweb:
> >
On Fri, 2020-10-09 at 07:58 +, tip-bot2 for Peter Zijlstra wrote:
> The following commit has been merged into the locking/core branch of tip:
>
> Commit-ID: 4d004099a668c41522242aa146a38cc4eb59cb1e
> Gitweb:
> https://git.kernel.org/tip/4d004099a668c41522242aa146a38cc4eb59cb1e
>
The following commit has been merged into the locking/core branch of tip:
Commit-ID: 4d004099a668c41522242aa146a38cc4eb59cb1e
Gitweb:
https://git.kernel.org/tip/4d004099a668c41522242aa146a38cc4eb59cb1e
Author:Peter Zijlstra
AuthorDate:Fri, 02 Oct 2020 11:04:21 +02:00
The following commit has been merged into the locking/core branch of tip:
Commit-ID: a046a86082cc3db21e98188a3ddda4e36288f5bf
Gitweb:
https://git.kernel.org/tip/a046a86082cc3db21e98188a3ddda4e36288f5bf
Author:Peter Zijlstra
AuthorDate:Fri, 02 Oct 2020 11:04:21 +02:00
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