linux-kernel - Re: HW breakpoints perf

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Message-ID: <20100119145027.GB8061@nowhere>
Date:	Tue, 19 Jan 2010 15:50:29 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Joshua Pincus <joshua.pincus@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>, peterz@...radead.org,
	paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: HW breakpoints perf_events request

On Mon, Jan 18, 2010 at 11:33:46AM -0500, Frank Ch. Eigler wrote:
> Frederic Weisbecker <fweisbec@...il.com> writes:
> 
> > [...]
> > What about extending ptrace to support a new type of
> > breakpoint debugging interface?
> 
> This is the sort of reason why the utrace-gdbstub prototype was
> constructed.  It should allow in-kernel implementation of the
> multithreaded gdb extensions.  (By the way, it can already use uprobes
> rather than userspace-managed breakpoints.)


Can utrace somehow meet Joshua's needs? I'm not sure what kind
of interface it can offer for that. The fact is I don't know
very well utrace :)  Do you plan a resubmission soon?

Thanks.

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