Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)
From: Peter Zijlstra
Date: Mon Jan 18 2010 - 07:14:51 EST
On Mon, 2010-01-18 at 14:09 +0200, Avi Kivity wrote:
> On 01/18/2010 02:06 PM, Peter Zijlstra wrote:
> > On Mon, 2010-01-18 at 14:01 +0200, Avi Kivity wrote:
> >> Maybe you place no value on uprobes. But people who debug userspace
> >> likely will see a reason.
> > I do see value in uprobes, I just don't like it mucking about with the
> > address space. Nor does it appear required.
> Well, the alternatives are very unappealing. Emulation and
> single-stepping are going to be very slow compared to a couple of jumps.
With CPL2 or RPL on user segments the protection issue seems to be
manageable for running the instructions from kernel space.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/