linux-kernel - Re: [PATCH 2/2] perf record: Replace 'overwrite' by 'flightrecorder' for better naming

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Date:   Wed, 1 Nov 2017 21:03:36 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     "Wangnan (F)" <wangnan0@...wei.com>
Cc:     linux-kernel@...r.kernel.org, kan.liang@...el.com, acme@...nel.org,
        jolsa@...hat.com, kernel-team@....com
Subject: Re: [PATCH 2/2] perf record: Replace 'overwrite' by 'flightrecorder'
 for better naming

On Wed, Nov 01, 2017 at 06:17:26PM +0800, Wangnan (F) wrote:
> 
> 
> On 2017/11/1 18:03, Namhyung Kim wrote:
> > On Wed, Nov 01, 2017 at 05:53:27AM +0000, Wang Nan wrote:
> > > The meaning of perf record's "overwrite" option and many "overwrite" in
> > > source code are not clear. In perf's code, the 'overwrite' has 2 meanings:
> > >   1. Make ringbuffer readonly (perf_evlist__mmap_ex's argument).
> > >   2. Set evsel's "backward" attribute (in apply_config_terms).
> > > 
> > > perf record doesn't use meaning 1 at all, but have a overwrite option, its
> > > real meaning is setting backward.
> > > 
> > > This patch separates these two concepts, introduce 'flightrecorder' mode
> > > which is what we really want. It combines these 2 concept together, wraps
> > > them into a record mode. In flight recorder mode, perf only dumps data before
> > > something happen.
> > I'm ok with the it but removing old name looks not good.  How about
> > keeping them for a while (as deprecated)?.
> 
> Is there a way to hide '--overwrite' from 'perf record --help' and print
> something
> when user really use it?

You can set PARSE_OPT_HIDDEN flag to it.

Thanks,
Namhyung


> 
> > And 'flightrecorder' seems too long.  Maybe you can use an acronym
> > like FDR or fdr-mode?
> 
> fdr-mode is a good name.
> 
> Thank you.
>