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Date:   Fri, 12 Mar 2021 07:14:37 -0800
From:   Andi Kleen <ak@linux.intel.com>
To:     Jin Yao <yao.jin@linux.intel.com>
Cc:     acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
        mingo@redhat.com, alexander.shishkin@linux.intel.com,
        Linux-kernel@vger.kernel.org, kan.liang@intel.com,
        yao.jin@intel.com
Subject: Re: [PATCH] perf stat: Create '--add-default' option to append
 default list
Message-ID: <20210312151437.GO203350@tassilo.jf.intel.com>
References: <20201222011131.12326-1-yao.jin@linux.intel.com>
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In-Reply-To: <20201222011131.12326-1-yao.jin@linux.intel.com>
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On Tue, Dec 22, 2020 at 09:11:31AM +0800, Jin Yao wrote:
> The event default list includes the most common events which are widely
> used by users. But with -e option, the current perf only counts the events
> assigned by -e option. Users may want to collect some extra events with
> the default list. For this case, users have to manually add all the events
> from the default list. It's inconvenient. Also, users may don't know how to
> get the default list.
> 
> It's better to add a new option to append default list to the -e events.
> The new option is '--add-default'.

A more concise syntax would be -e +event

The + would apply to the whole event list if there are multiple.

and maybe -event too to remove something from the default list.

-Andi