linux-kernel - Re: [RFC/PATCH 1/2] perf script: Add --time-filter option

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Message-ID: <51944796.7020505@gmail.com>
Date:	Wed, 15 May 2013 20:42:30 -0600
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [RFC/PATCH 1/2] perf script: Add --time-filter option

On 5/15/13 7:56 PM, Namhyung Kim wrote:
>> How about just --time? less typing.
>
> Thanks, I'm fine with '--time' too but '--time-filter' looks more

yes, I just have really long command lines now. Is there a consistent 
single letter (X?)?

> obvious.  What does the timehist command do, btw? ;)

task scheduling time history including run time and time between 
sched-in. It needs to be updated to use tracepoints and perhaps fold 
into perf-sched (e.g., perf sched history). Too many features; too 
little time. I hope to get to it in the next month or so.


>> I would expect parse_nsec_time to fail. e.g., a time string like 123455.a
>
> It looks like current strtol() returns 0 when failed to parse like
> above.  Hmm.. do I have to check whether the return value is 0 or just
> ignore invalid inputs?

end will point to the next character not converted so make sure it is as 
expected (*end == '\0').

David
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