(2013/10/21 0:42), Paul E. McKenney wrote:
> On Sat, Oct 19, 2013 at 06:02:39PM -0400, Steven Rostedt wrote:
>> On Sat, 19 Oct 2013 14:33:50 -0700
>> "Paul E. McKenney" wrote:
>>
>>
> It's used to convert the calls to mcount to nops. But maybe a better
> thing to do is to check if we only
On Sat, Oct 19, 2013 at 06:02:39PM -0400, Steven Rostedt wrote:
> On Sat, 19 Oct 2013 14:33:50 -0700
> "Paul E. McKenney" wrote:
>
>
> > > > It's used to convert the calls to mcount to nops. But maybe a better
> > > > thing to do is to check if we only have a single CPU:
> > > >
> > > > static
On Sat, 19 Oct 2013 14:33:50 -0700
"Paul E. McKenney" wrote:
> > > It's used to convert the calls to mcount to nops. But maybe a better
> > > thing to do is to check if we only have a single CPU:
> > >
> > > static void run_sync(void)
> > > {
> > > if (num_online_cpus() != 1)
> >
> > Hmm, t
On Sat, 19 Oct 2013 14:33:50 -0700
"Paul E. McKenney" wrote:
> > /* Ideally we would like to run on zero CPUS! */
> > if (num_online_cpus() < 2)
>
> To be really safe, shouldn't you use complex numbers? Just in case
> you end up running on a system with 5i-3 CPUs or something. ;-)
>
On Sat, Oct 19, 2013 at 03:19:19PM -0400, Steven Rostedt wrote:
>
> [ Added Paul because he'll understand this ]
>
> On Sat, 19 Oct 2013 15:16:58 -0400
> Steven Rostedt wrote:
>
> > On Sun, 20 Oct 2013 00:02:32 +0900
> > Masami Hiramatsu wrote:
> >
> > > (2013/10/18 23:27), Petr Mladek wrote:
[ Added Paul because he'll understand this ]
On Sat, 19 Oct 2013 15:16:58 -0400
Steven Rostedt wrote:
> On Sun, 20 Oct 2013 00:02:32 +0900
> Masami Hiramatsu wrote:
>
> > (2013/10/18 23:27), Petr Mladek wrote:
> > > We would like to use text_poke_bp in ftrace. It might be called also
> > > d
On Sun, 20 Oct 2013 00:02:32 +0900
Masami Hiramatsu wrote:
> (2013/10/18 23:27), Petr Mladek wrote:
> > We would like to use text_poke_bp in ftrace. It might be called also during
> > boot when the interupts are disabled. We need to enable them for syncing
> > the cores on each CPU. Otherwise, th
(2013/10/18 23:27), Petr Mladek wrote:
> We would like to use text_poke_bp in ftrace. It might be called also during
> boot when the interupts are disabled. We need to enable them for syncing
> the cores on each CPU. Otherwise, there might be a deadlock, see the
> warning in "smp_call_function_many
We would like to use text_poke_bp in ftrace. It might be called also during
boot when the interupts are disabled. We need to enable them for syncing
the cores on each CPU. Otherwise, there might be a deadlock, see the
warning in "smp_call_function_many", kernel/smp.c:371.
This change is taken from
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