Re: [PATCH v5 11/11] tools/proctrace: add proctrace tool

[Jan Beulich <jbeulich@xxxxxxxx>]

On 05.07.2020 20:58, Michał Leszczyński wrote:
> ----- 5 lip 2020 o 20:55, Michał Leszczyński michal.leszczynski@xxxxxxx 
> napisał(a):
>> --- /dev/null
>> +++ b/tools/proctrace/proctrace.c
>> +#include <stdlib.h>
>> +#include <stdio.h>
>> +#include <sys/mman.h>
>> +#include <signal.h>
>> +
>> +#include <xenctrl.h>
>> +#include <xen/xen.h>
>> +#include <xenforeignmemory.h>
>> +
>> +#define BUF_SIZE (16384 * XC_PAGE_SIZE)
> 
> I would like to discuss here, how we should retrieve the trace buffer size
> in runtime? Should there be a hypercall for it, or some extension to
> acquire_resource logic?

Personally I'd prefer the latter, but the question is whether one can
be made in a backwards compatible way.

Jan