linux-kernel - Re: [PATCH v9 4/4] nmi_backtrace: generate one-line reports for idle cpus

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Date:   Tue, 30 Aug 2016 17:46:41 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Chris Metcalf <cmetcalf@...lanox.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Russell King <linux@....linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Aaron Tomlin <atomlin@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Andrew Morton <akpm@...l.org>,
        Daniel Thompson <daniel.thompson@...aro.org>, x86@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v9 4/4] nmi_backtrace: generate one-line reports for idle
 cpus

On Mon 2016-08-29 12:12:49, Chris Metcalf wrote:
> When doing an nmi backtrace of many cores, most of which are idle,
> the output is a little overwhelming and very uninformative.  Suppress
> messages for cpus that are idling when they are interrupted and just
> emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN".
> 
> We do this by grouping all the cpuidle code together into a new
> .cpuidle.text section, and then checking the address of the
> interrupted PC to see if it lies within that section.
> 
> This commit suitably tags x86 and tile idle routines, and only
> adds in the minimal framework for other architectures.
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Tested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Tested-by: Daniel Thompson <daniel.thompson@...aro.org> [arm]
> Signed-off-by: Chris Metcalf <cmetcalf@...lanox.com>

This version works even with my configuration. Feel free to
add

Tested-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr