linux-kernel - Re: [PATCH 05/11] perf intel-pt: Use itrace error flags to suppress some errors

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Message-ID: <20200709175046.GA1126680@tassilo.jf.intel.com>
Date:   Thu, 9 Jul 2020 10:50:46 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] perf intel-pt: Use itrace error flags to suppress
 some errors

On Thu, Jul 09, 2020 at 08:36:22PM +0300, Adrian Hunter wrote:
> The itrace "e" option may be followed by a number which has the
> following effect for Intel PT:
> 	1	Suppress overflow events
> 	2	Suppress trace data lost events
> The values may be combined by bitwise OR'ing them.
> 
> Suppressing those errors can be useful for testing and debugging
> because they are not due to decoding.

I suspect it will be useful to more than just decoding and debugging.

But the number is not a nice user interface.

How about e[....] 

like e[ol] 

Also it's a bit unusual that this disables instead of enables, but ok.

-Andi