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

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Message-ID: <20130426164716.GA30402@redhat.com>
Date:	Fri, 26 Apr 2013 18:47:16 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Jacob Shin <jacob.shin@....com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Will Deacon <will.deacon@....com>,
	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 1/4] perf: Add hardware breakpoint address mask

On 04/25, Jacob Shin wrote:
>
> Right now perf
> userland tool hard codes bp_len to 4, so I need to modify it to allow
> user to override the length if desired.

imho this itself looks like a good change...

> Oleg, Frederic, et al.
>
> Which syntax do you prefer?
>
>   $ perf stat -e mem:0x1000/16

Personally I like this a bit more, but I won't argue in any case.

Oleg.

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