linux-kernel - Re: [PATCH] Remove redhat'ism from ftrace selftests.

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Date:	Wed, 04 Mar 2015 21:47:47 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Dave Jones <davej@...emonkey.org.uk>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Remove redhat'ism from ftrace selftests.

On Tue, 2015-03-03 at 17:05 -0700, Shuah Khan wrote:
> On 02/27/2015 08:16 PM, Namhyung Kim wrote:
> > On Tue, Feb 24, 2015 at 01:24:59PM -0500, Dave Jones wrote:
> >> On Tue, Feb 24, 2015 at 11:22:58AM -0700, Shuah Khan wrote:
> >>  > On 02/24/2015 11:18 AM, Steven Rostedt wrote:
> >>  > > 
> >>  > > Shuah,
> >>  > > 
> >>  > > Can you take this in your tree?
> >>  > 
> >>  > Yes I can do that. This must be the original patch email:
> >>  > https://lkml.org/lkml/2015/2/24/435
> > 
> > Please see below links:
> > 
> > https://lkml.org/lkml/2014/12/10/52
> > https://lkml.org/lkml/2014/12/22/556
> > 
> > I think we can get rid of the (u)sleeps entirely since 'cat trace'
> > itself should trigger scheduler events.
> 
> Steve/Dave,
> 
> Still good to take it through. The discussion in the threads
> Namhyung Kim pointed to seem to be inconclusive.
> 
> The only difference between the original patch
> https://lkml.org/lkml/2014/12/9/780
> and
> https://lkml.org/lkml/2015/2/24/435
> 
> is sleep duration change. I can take through my tree
> https://lkml.org/lkml/2015/2/24/435
> 
> just confirming.

No, the resoultion was that busybox doesn't support fractional sleeps and so
using them is not a solution.

I thought /bin/true would work, but never got around to testing it. The other
option was to use (echo "forked"):

https://lkml.org/lkml/2014/12/23/447

cheers


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