linux-kernel - Re: [PATCH] perf list: Hide deprecated events by default

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Date:   Wed, 16 Oct 2019 11:47:59 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jin Yao <yao.jin@...ux.intel.com>, acme@...nel.org,
        jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH] perf list: Hide deprecated events by default

On Tue, Oct 15, 2019 at 11:14:01AM +0200, Jiri Olsa wrote:
> On Tue, Oct 15, 2019 at 10:53:57AM +0800, Jin Yao wrote:
> > There are some deprecated events listed by perf list. But we can't remove
> > them from perf list with ease because some old scripts may use them.
> > 
> > Deprecated events are old names of renamed events.  When an event gets
> > renamed the old name is kept around for some time and marked with
> > Deprecated. The newer Intel event lists in the tree already have these
> > headers.
> > 
> > So we need to keep them in the event list, but provide a new option to
> > show them. The new option is "--deprecated".
> > 
> > With this patch, the deprecated events are hidden by default but they can
> > be displayed when option "--deprecated" is enabled.
> 
> not sure it's wise to hide them, because people will not read man page
> to find --deprecated option, they will rather complain right away ;-)

perf list will have the same event with a different name.

If someone is using perf list presumably they don't know the event name,
and look at the description, and the description is still there,
just with a new name.

Old scripts of course still work because -e looks up deprecated
events too.

-Andi