linux-kernel - Re: [PATCH v4 0/3] *** Latency histograms

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Date:   Tue, 30 Aug 2016 13:39:43 +0200
From:   Daniel Wagner <daniel.wagner@...-carit.de>
To:     Binoy Jayan <binoy.jayan@...aro.org>,
        "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
CC:     Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        <linux-kernel@...r.kernel.org>,
        Masami <masami.hiramatsu@...aro.org>
Subject: Re: [PATCH v4 0/3] *** Latency histograms - IRQSOFF,PREEMPTOFF ***

Hi Binoy,

On 08/30/2016 12:28 PM, Binoy Jayan wrote:
> Examples of triggers:
> echo 'hist:key=latency.log2:val=hitcount:sort=latency' > /sys/kernel/debug/tracing/events/latency/latency_preempt/trigger
> echo 'hist:key=cpu,latency:val=hitcount:sort=latency if cpu==1' > /sys/kernel/debug/tracing/events/latency/latency_preempt/trigger
> echo 'hist:key=ltype,cpu:val=latency:sort=ltype,cpu if ltype==0' > /sys/kernel/debug/tracing/events/latency/latency_preempt/trigger
>
> Histogram output:
> cat /sys/kernel/debug/tracing/events/latency/latency_preempt/hist

Could you also add couple of test cases to 
tools/testing/selftests/ftrace/test.d/trigger?

Especially the sorting thing you mentioned in the other mail? Obviously 
first we need to figure out what is the expected behavior of it :)

cheers,
daniel