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

Adrian Hunter
2020-07-09T18:14:24Z

On 9/07/20 8:50 pm, Andi Kleen wrote:
> 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]

Do you mean literally square-brackets? If you were really unlucky you might
get pathname expansion with that.

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