Re: [PATCH V2 1/4] perf: Add hardware breakpoint address mask

From: H. Peter Anvin
Date: Thu Apr 25 2013 - 13:18:32 EST

On 04/25/2013 10:06 AM, Oleg Nesterov wrote:
>> The downside is that in userland perf tool we need differing documentation
>> on what the mask syntax means for each architecture.
> Personally I think this is acceptable.
> But I am new to this code, so...

That would seem really, really awkward. Yes, perf has a bunch of
low-level stuff, but it would seem highly undesirable to force the user
to deal with something like that.

It would be good to have a user-friendly syntax that covers most of what
users may want to do and perhaps a longer form that can express
everything including ARM's byte selects; if the system can't honor the
request it should return an error.


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