linux-kernel - Re: [PATCH v6 2/2] tracing: Add support for preempt and irq enable/disable events

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Message-ID: <20170925224725.3309f8c3@vmware.local.home>
Date:   Mon, 25 Sep 2017 22:47:25 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Joel Fernandes <joelaf@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com
Subject: Re: [PATCH v6 2/2] tracing: Add support for preempt and irq
 enable/disable events

On Mon, 25 Sep 2017 15:57:30 -0700
Joel Fernandes <joelaf@...gle.com> wrote:

> 2. This stuff is already a bit trace heavy, I prefer not to generate
> event every time the preempt count increases. Ofcourse filters but
> still then we have the filtering overhead for a usecase that I am not
> really targetting with this patchset.

This is actually a key reason I would agree with Joel. Just tracing the
toggle is extremely heavy. Adding all the other calls will probably
make it useless.

-- Steve