linux-kernel - Re: [PATCH 3/4] perf inject: add jitdump mmap injection support

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Message-ID: <20150212081954.GF30788@sejong>
Date:	Thu, 12 Feb 2015 17:19:54 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	jolsa@...hat.com, cel@...ibm.com, sukadev@...ux.vnet.ibm.com,
	sonnyrao@...omium.org, johnmccutchan@...gle.com
Subject: Re: [PATCH 3/4] perf inject: add jitdump mmap injection support

On Wed, Feb 11, 2015 at 08:27:17AM -0700, David Ahern wrote:
> On 2/10/15 4:42 PM, Stephane Eranian wrote:
> >diff --git a/tools/perf/Documentation/perf-inject.txt b/tools/perf/Documentation/perf-inject.txt
> >index dc7442c..237f195 100644
> >--- a/tools/perf/Documentation/perf-inject.txt
> >+++ b/tools/perf/Documentation/perf-inject.txt
> >@@ -40,6 +40,17 @@ OPTIONS
> >  	Merge sched_stat and sched_switch for getting events where and how long
> >  	tasks slept. sched_switch contains a callchain where a task slept and
> >  	sched_stat contains a timeslice how long a task slept.
> >+-j::
> >+--jit::
> >+	Merge a jitdump file into the perf.data file by adding mmap records to
> >+	cover jitted code and emit ELF images for each jitted function. The ELF
> >+	images are saved in the same directory as the jidump. Use -E to suppress
> >+	ELF images generation.
> >+-E::
> >+--jit-disable-elf::
> >+	When used with -, it prevents creating the ELF images for each jitted
> >+	function. Only the jitted code mmap records are injected into the perf.data
> >+	file. Option as no effect when -j is not used.
> 
> s/as/has/. But it would better to avoid the double negative. Maye something
> like this instead:
> 
>     This option requires -j|--jit.

I think same thing may go to the option name itself.  It can be, say,
--jit-create-elf and turned on by default.  When one wants to disable
it, [s]he can use --no-jit-create-elf.  Of course this way we cannot
use the short name (-E) for disabling tho.

Thanks,
Namhyung
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