linux-kernel - Re: [PATCH V4 0/3] perf/x86/amd: AMD Family 16h Data Breakpoint Extensions

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Message-ID: <20130428163127.GA25477@redhat.com>
Date:	Sun, 28 Apr 2013 18:31:27 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Jacob Shin <jacob.shin@....com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH V4 0/3] perf/x86/amd: AMD Family 16h Data Breakpoint
	Extensions

On 04/28, Jacob Shin wrote:
>
> The following patchset enables hardware breakpoint bp_len greater than
> HW_BREAKPOINT_LEN_8 on AMD Family 16h and later.
>
>   $ perf stat -e mem:0x1000/16:w a.out
>                             ^^
>                             bp_len
>
> Will count writes to [0x1000 ~ 0x1010)

Obviously I can't ack the changes in this area, but to me the whole
series looks fine.

Afaics this needs more work to actually support a range on executable
breakpoint, but I believe this needs another series.

Oleg.

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