linux-kernel - Re: [PATCH 2/2] tracing: Add support for critical section events

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Message-ID: <20170904075614.bjkkrgyv2dpz7x5v@hirez.programming.kicks-ass.net>
Date:   Mon, 4 Sep 2017 09:56:14 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        kernel-team@...roid.com, Ingo Molnar <mingo@...hat.com>,
        Byungchul Park <byungchul.park@....com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 2/2] tracing: Add support for critical section events

On Sun, Sep 03, 2017 at 01:50:51AM -0700, Joel Fernandes wrote:
> Critical section trace events can be used for tracing the start and
> end of a critical section which can be used by a trace viewer like
> systrace to graphically view the start and end of a critical section and
> correlate them with latencies and scheduling issues.
> 
> Reason for starting critical section:
> Either preemption or interrupts were turned off.
> Reason for ending critical section:
> Both preemption and interrupts are now turned back on.

Please don't use the name critical section for this. Also IRQ and
preempt already have a gazillion trace hooks, why do we need more?