Messages in this thread | | | Subject | Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP) | From | Peter Zijlstra <> | Date | Mon, 18 Jan 2010 13:14:17 +0100 |
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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.
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