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From: Peter Zijlstra <peterz@infradead.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Abderrahmane Benbachir <abderrahmane.benbachir@polymtl.ca>,
	linux-kernel@vger.kernel.org, mingo@redhat.com,
	mathieu.desnoyers@efficios.com,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [RFC PATCH v2] ftrace: support very early function tracing
Date: Wed, 8 Nov 2017 20:33:52 +0100	[thread overview]
Message-ID: <20171108193352.GM3326@worktop> (raw)
In-Reply-To: <20171108141907.38d7cdda@gandalf.local.home>

On Wed, Nov 08, 2017 at 02:19:07PM -0500, Steven Rostedt wrote:
> On Wed, 8 Nov 2017 20:07:27 +0100
> Peter Zijlstra <peterz@infradead.org> wrote:
> 
> > Depends on how early you need things; ideally you'd be able to use the
> 
> Well, he starts tracing at the entry of start_kernel(), would this
> handle that?

You'll have to run something first to initialize clocks in any case.
He's calling native_calibrate_cpu() (which of course if completely
broken for virt).

So you might as well setup the sched_clock() infra properly.

  reply	other threads:[~2017-11-08 19:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-07 23:44 [RFC PATCH v2] ftrace: support very early function tracing Abderrahmane Benbachir
2017-11-08  2:17 ` Steven Rostedt
2017-11-08  8:10   ` Peter Zijlstra
2017-11-08 16:07     ` Steven Rostedt
2017-11-08 19:07       ` Peter Zijlstra
2017-11-08 19:19         ` Steven Rostedt
2017-11-08 19:33           ` Peter Zijlstra [this message]
2017-11-08 15:56   ` Abderrahmane Benbachir
2017-11-08 18:44     ` Abderrahmane Benbachir
2017-11-08 19:09       ` Steven Rostedt

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