Re: ftrace multibuffer && rcu (Was: tracing/uprobes: Supportftrace_event_file base multibuffer)

From: Oleg Nesterov
Date: Fri Jun 14 2013 - 13:06:49 EST

On 06/14, Steven Rostedt wrote:
> On Fri, 2013-06-14 at 18:04 +0200, Oleg Nesterov wrote:
> >
> > But the main problem is, synchronize_sched() is slow and it is called
> > under the global event_mutex.
> But is that really an issue? event_mutex is used to add or remove
> events, and this happens only when we load or unload a module, or add or
> remove a probe. These are mostly user operations that take a relatively
> long time to complete (but not relative to humans).

OK, please ignore then.


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