linux-kernel - Re: [RFC PATCH v2] ftrace: support very early function tracing

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Message-ID: <20171108141907.38d7cdda@gandalf.local.home>
Date:   Wed, 8 Nov 2017 14:19:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Abderrahmane Benbachir <abderrahmane.benbachir@...ymtl.ca>,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        mathieu.desnoyers@...icios.com,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH v2] ftrace: support very early function tracing

On Wed, 8 Nov 2017 20:07:27 +0100
Peter Zijlstra <peterz@...radead.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?

-- Steve

> stuff from here:
> 
>   https://lkml.kernel.org/r/1504116205-355281-1-git-send-email-pasha.tatashin@oracle.com
> 
> That is, fix the normal time sources to work earlier instead of building
> parallel infrastructure.