linux-kernel - Re: [PATCH RFC v2 3/3] drivers: irqchip: pdc: log PDC info in FTRACE

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Message-ID: <20180205115716.61e0b881@gandalf.local.home>
Date:   Mon, 5 Feb 2018 11:57:16 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, sboyd@...eaurora.org,
        rnayak@...eaurora.org, asathyak@...eaurora.org,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH RFC v2 3/3] drivers: irqchip: pdc: log PDC info in
 FTRACE

On Mon, 5 Feb 2018 15:18:46 +0000
Lina Iyer <ilina@...eaurora.org> wrote:

> >Some product configurations disable debugfs. I will ask around if this
> >can be dropped.
> >  
> Memory dumps after a crash have support for FTRACE and it helps greatly
> on production issues. Hence the preference for FTRACE support.

Note, ftrace no longer depends on debugfs. It has its own tracefs file
system:

 # mount -t tracefs nodev /sys/kernel/tracing

-- Steve