Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

From: Avi Kivity
Date: Mon Jan 18 2010 - 11:53:14 EST

On 01/18/2010 05:43 PM, Ananth N Mavinakayanahalli wrote:

Well, the alternatives are very unappealing. Emulation and single-stepping
are going to be very slow compared to a couple of jumps.
So how big chunks of the address space are we talking here for uprobes?
As Srikar mentioned, the least we start with is 1 page. Though you can
have as many probes as you want, there are certain optimizations we can
do, depending on the most common usecases.

For eg., if you'd consider the start of a routine to be the most
commonly traced location, most routines in a binary would generally
start with the same instruction (say push %ebp), and we can refcount a
slot with that instruction to be used for all probes of the same

But then you can't follow the instruction with a jump back to the code...

error compiling committee.c: too many arguments to function

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