linux-kernel - Re: [PATCH] kselftests: ftrace: limit the executing time by reading from cached trace

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Message-ID: <20211019223454.5da09d74@gandalf.local.home>
Date:   Tue, 19 Oct 2021 22:34:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Li Zhijian <lizhijian@...fujitsu.com>, <mingo@...hat.com>,
        <shuah@...nel.org>, <linux-kselftest@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Philip Li <philip.li@...el.com>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] kselftests: ftrace: limit the executing time by reading
 from cached trace

On Wed, 20 Oct 2021 11:20:27 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Hmm, by the way, shouldn't we set this feature by default?
> There are many "cat trace | grep ..." style test code in ftracetest just for
> checking whether the event is recorded. At least for the ftracetest, it should
> be set unless the testcase is explicitly disable it.

For testing, sure.

I was criticized by the BPF folks about tracing stopping when the trace
file was being read. So for normal operations, it doesn't pause, because
that "confuses" people (so I am told).

-- Steve