linux-kernel - Re: [PATCH 1/3] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN

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Date:	Tue, 10 Dec 2013 15:52:51 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	jacob.w.shin@...il.com, Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Melo <acme@...stprotocols.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Sherry Hurwitz <sherry.hurwitz@....com>
Subject: Re: [PATCH 1/3] perf/x86/amd: AMD support for bp_len >
 HW_BREAKPOINT_LEN_8

On Wed, Dec 04, 2013 at 02:57:43PM +0100, Oleg Nesterov wrote:
> > Ideally it would be nice if we drop bp_mask and use extended ranges
> > only when len > 8. How does that sound?
> 
> Again, iirc, this is what the code does. except (in essence) it checks
> mask != 0 instead of len > 8.
> 
> And yes, we can probably drop bp_mask (unless we are going to support
> the contiguous ranges), just I think we can do this later.

Ah wait, I understand now, this is not a user ABI, just an internal state.
So you're right after all.

It's never too late to be unconfused ;)

Ok let me dig into more details on the patchset.

Thanks.
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