linux-kernel - Re: [PATCH] ftracetest: replace usleep by sleep

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Date:	Thu, 26 Mar 2015 02:50:50 +0000
From:	Pádraig Brady <P@...igBrady.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Luis Henriques <luis.henriques@...onical.com>
CC:	Shuah Khan <shuahkh@....samsung.com>,
	Namhyung Kim <namhyung@...nel.org>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH] ftracetest: replace usleep by sleep

On 25/03/15 18:57, Steven Rostedt wrote:
> On Wed, 25 Mar 2015 17:36:34 +0000
> Luis Henriques <luis.henriques@...onical.com> wrote:
> 
>> 'usleep' seems to be a distro-specific utility and may not be
>> available:
>>
>>  [5] event tracing - enable/disable with event level files       [FAIL]
>>  execute: /home/miguel/linux/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
>>  + . /home/miguel/linux/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
>>  + [ ! -f set_event -o ! -d events/sched ]
>>  + reset_tracer
>>  + echo nop
>>  + do_reset
>>  + echo
>>  + clear_trace
>>  + echo
>>  + echo sched:sched_switch
>>  + usleep 1
>>  ./ftracetest: 24: /home/miguel/linux/tools/testing/selftests/ftrace/test.d/event/event-enable.tc: usleep: not found
>>
>> Replace it with the more standard sleep.
>>
>> Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
>> ---
>>  tools/testing/selftests/ftrace/test.d/event/event-enable.tc     | 6 +++---
>>  tools/testing/selftests/ftrace/test.d/event/subsystem-enable.tc | 6 +++---
>>  2 files changed, 6 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
>> index 668616d9bb03..abafc0c3605c 100644
>> --- a/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
>> +++ b/tools/testing/selftests/ftrace/test.d/event/event-enable.tc
>> @@ -21,7 +21,7 @@ reset_tracer
>>  do_reset
>>  
>>  echo 'sched:sched_switch' > set_event
>> -usleep 1
>> +sleep 0.001
> 
> We had patches out about this, because sleep 0.001 is not always
> supported either.

really?
In that edge case you might:

  sleep .001 || sleep 1

Pádraig.
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