On Tue, May 1, 2018 at 7:24 AM Steven Rostedt wrote:
> On Mon, 30 Apr 2018 18:42:03 -0700
> Joel Fernandes wrote:
> > In recent tests with IRQ on/off tracepoints, a large performance
> > overhead ~10% is noticed when running hackbench. This is root caused to
> > calls to rcu_irq_enter_irqson an
Missed replying to some comments..
On Tue, May 1, 2018 at 7:24 AM Steven Rostedt wrote:
> On Mon, 30 Apr 2018 18:42:03 -0700
> Joel Fernandes wrote:
> > In recent tests with IRQ on/off tracepoints, a large performance
> > overhead ~10% is noticed when running hackbench. This is root caused to
On Tue, May 01, 2018 at 03:23:52PM +, Joel Fernandes wrote:
> On Tue, May 1, 2018 at 8:20 AM Paul E. McKenney
> wrote:
> [...]
> > > > > > --- a/kernel/tracepoint.c
> > > > > > +++ b/kernel/tracepoint.c
> > > > > > @@ -31,6 +31,9 @@
> > > > > > extern struct tracepoint * const __start___trace
On Tue, May 1, 2018 at 8:20 AM Paul E. McKenney
wrote:
[...]
> > > > > --- a/kernel/tracepoint.c
> > > > > +++ b/kernel/tracepoint.c
> > > > > @@ -31,6 +31,9 @@
> > > > > extern struct tracepoint * const __start___tracepoints_ptrs[];
> > > > > extern struct tracepoint * const __stop___tracepoint
On Tue, May 01, 2018 at 03:16:02PM +, Joel Fernandes wrote:
> On Tue, May 1, 2018 at 7:34 AM Paul E. McKenney
> wrote:
>
> > On Tue, May 01, 2018 at 10:24:01AM -0400, Steven Rostedt wrote:
> > > On Mon, 30 Apr 2018 18:42:03 -0700
> > > Joel Fernandes wrote:
> > >
> > > > In recent tests with
On Tue, May 1, 2018 at 7:34 AM Paul E. McKenney
wrote:
> On Tue, May 01, 2018 at 10:24:01AM -0400, Steven Rostedt wrote:
> > On Mon, 30 Apr 2018 18:42:03 -0700
> > Joel Fernandes wrote:
> >
> > > In recent tests with IRQ on/off tracepoints, a large performance
> > > overhead ~10% is noticed when
On Tue, May 01, 2018 at 10:24:01AM -0400, Steven Rostedt wrote:
> On Mon, 30 Apr 2018 18:42:03 -0700
> Joel Fernandes wrote:
>
> > In recent tests with IRQ on/off tracepoints, a large performance
> > overhead ~10% is noticed when running hackbench. This is root caused to
> > calls to rcu_irq_ente
On Tue, 01 May 2018 01:56:01 +
Joel Fernandes wrote:
> This last bit is supposed to be srcu_dereference_notrace. The hunk to use
> that is actually in patch 6/6 , sorry about that. I've fixed it in my tree
> and it means patches 5/6 and 6/6 need an update. Steve, if you want me to
> repost i
On Mon, 30 Apr 2018 18:42:03 -0700
Joel Fernandes wrote:
> In recent tests with IRQ on/off tracepoints, a large performance
> overhead ~10% is noticed when running hackbench. This is root caused to
> calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the
> tracepoint code. Following a lon
On Mon, Apr 30, 2018 at 6:42 PM Joel Fernandes wrote:
> In recent tests with IRQ on/off tracepoints, a large performance
> overhead ~10% is noticed when running hackbench. This is root caused to
> calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the
> tracepoint code. Following a long d
In recent tests with IRQ on/off tracepoints, a large performance
overhead ~10% is noticed when running hackbench. This is root caused to
calls to rcu_irq_enter_irqson and rcu_irq_exit_irqson from the
tracepoint code. Following a long discussion on the list [1] about this,
we concluded that srcu is
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