linux-kernel - Re: [PATCH] ftracetest: Do not use usleep

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Message-ID: <20150330210444.7cc5521c@grimm.local.home>
Date:	Mon, 30 Mar 2015 21:04:44 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Shuah Khan <shuahkh@....samsung.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Dave Jones <davej@...emonkey.org.uk>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: Re: [PATCH] ftracetest: Do not use usleep

On Tue, 31 Mar 2015 09:48:55 +0900
Namhyung Kim <namhyung@...nel.org> wrote:


> I understand your point.  But this is not just cat, it needs grep and
> wc also.  So I think there should be scheduler event(s).
>

Yes, and cat opens 'trace', which will disable tracing, and if that
happens before grep and wc, then those events will not show up.

There was a time when these tests use to fail without adding something
to force a schedule, that's why I feel it's safe to add something.

-- Steve
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