linux-kernel - Re: [PATCH] ftracetest: Replace usleep with sleep 0.000001

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Message-ID: <1419318514.32430.1.camel@ellerman.id.au>
Date:	Tue, 23 Dec 2014 18:08:34 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Pavel Machek <pavel@....cz>,
	masami.hiramatsu.pt@...achi.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ftracetest: Replace usleep with sleep 0.000001

On Tue, 2014-12-23 at 13:21 +0900, Namhyung Kim wrote:
> On Sat, Dec 20, 2014 at 05:07:25PM -0500, Steven Rostedt wrote:
> > On Sat, 20 Dec 2014 21:42:13 +0100
> > Pavel Machek <pavel@....cz> wrote:
> > 
> > > On Wed 2014-12-10 15:38:27, Michael Ellerman wrote:
> > > > usleep is a Fedoraism, it's not generally available on Debian based
> > > > systems AFAICS.
> > > > 
> > > > GNU sleep accepts a floating point argument, so use that instead.
> > > > 
> > > > Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> > > 
> > > Could ftrace user interface be enhanced not to need random delays?
> > > 
> > 
> > Not sure what you are talking about. These "random delays" are not for
> > the interface, but instead to force some events to happen and to make
> > sure they did.
> > 
> > As the subject states, this is for "ftracetest" which is the selftests
> > for ftrace.
> > 
> > The usleep is basically a "do something to trigger events", and we
> > don't want to wait long in doing it.
> 
> Right.  AFAIK what ftracetest expects is a scheduler event so it
> doesn't need to be the [u]sleep.

Would /bin/true work in that case?

cheers


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