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From: Ingo Molnar <mingo@elte.hu>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: "Luck, Tony" <tony.luck@intel.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Huang, Ying" <ying.huang@intel.com>,
	"bp@alien8.de" <bp@alien8.de>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"mchehab@redhat.com" <mchehab@redhat.com>,
	"Frédéric Weisbecker" <fweisbec@gmail.com>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>,
	"Arjan van de Ven" <arjan@infradead.org>,
	"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>
Subject: Re: [RFC/Requirements/Design] h/w error reporting
Date: Wed, 10 Nov 2010 19:49:31 +0100	[thread overview]
Message-ID: <20101110184931.GI22410@elte.hu> (raw)
In-Reply-To: <1289413916.2084.30.camel@laptop>


* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> On Wed, 2010-11-10 at 10:23 -0800, Luck, Tony wrote:
> > > A few of things that pop up quickly are:
> > >
> > > 1) lockless
> > 
> > This is a clear requirement for use in h/w error
> > reporting too.  Taking locks in NMI or machine
> > check handler isn't an option.
> 
> Don't worry, lots of PMIs are NMIs, perf needs to be fully NMI safe
> otherwise things simply don't work.

Yep, in fact perf was fully NMI safe earlier than the ftrace ring-buffer.

When perf code is NMI unsafe we notice it very quickly. I regularly record millions 
of events per second.

Thanks,

	Ingo

  reply	other threads:[~2010-11-10 18:50 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-11-10  0:56 [RFC/Requirements/Design] h/w error reporting Luck, Tony
2010-11-10 10:14 ` Ingo Molnar
2010-11-10 14:40   ` Steven Rostedt
2010-11-10 14:43     ` Peter Zijlstra
2010-11-10 15:09       ` Steven Rostedt
2010-11-10 15:28         ` Mathieu Desnoyers
2010-11-10 15:30         ` Peter Zijlstra
2010-11-10 15:53           ` Steven Rostedt
2010-11-10 16:52           ` Steven Rostedt
2010-11-10 17:05             ` Borislav Petkov
2010-11-10 17:41               ` Ingo Molnar
2010-11-10 17:50                 ` Luck, Tony
2010-11-10 18:09                 ` Steven Rostedt
2010-11-10 18:52                   ` Ingo Molnar
2010-11-10 17:25             ` Frederic Weisbecker
2010-11-10 17:48           ` Ingo Molnar
2010-11-10 18:05             ` Steven Rostedt
2010-11-10 18:23               ` Luck, Tony
2010-11-10 18:31                 ` Peter Zijlstra
2010-11-10 18:49                   ` Ingo Molnar [this message]
2010-11-10 18:24               ` Peter Zijlstra
2010-11-10 18:41                 ` Ingo Molnar
2010-11-10 19:00                   ` Steven Rostedt
2010-11-10 19:11                     ` Ingo Molnar
2010-11-10 19:11                     ` Frederic Weisbecker
2010-11-10 19:30                       ` Ingo Molnar
2010-11-10 19:48                         ` Steven Rostedt
2010-11-10 20:23                       ` Tracing Requirements (was: [RFC/Requirements/Design] h/w error reporting) Mathieu Desnoyers
2010-11-10 20:54                         ` Luck, Tony
2010-11-10 21:06                           ` Steven Rostedt
2010-11-10 21:34                             ` Steven Rostedt
2010-11-10 22:51                           ` Mathieu Desnoyers
2010-11-10 23:12                             ` Thomas Gleixner
2010-11-10 23:20                               ` Steven Rostedt
2010-11-10 23:45                                 ` Thomas Gleixner
2010-11-11 18:25                                 ` Ted Ts'o
2010-11-10 23:28                               ` Mathieu Desnoyers
2010-11-10 23:58                                 ` Thomas Gleixner
2010-11-11  9:17                                   ` Ingo Molnar
2010-11-11 13:37                                     ` Mathieu Desnoyers
2010-11-10 21:30                         ` Frederic Weisbecker
2010-11-10 21:54                           ` Steven Rostedt
2010-11-10 22:19                             ` Frederic Weisbecker
2010-11-10 22:49                             ` Frederic Weisbecker
2010-11-11  0:11                           ` Mathieu Desnoyers
2010-11-11 16:10                             ` Steven Rostedt
2010-11-11 16:34                               ` Mathieu Desnoyers
2010-11-10 19:16                 ` [RFC/Requirements/Design] h/w error reporting Steven Rostedt
2010-11-10 19:38                 ` Steven Rostedt
2010-11-10 18:27               ` Ingo Molnar

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