malloc cache/trace preview

[Szabolcs Nagy]

On 10/02/16 12:48, Florian Weimer wrote:
> On 02/10/2016 01:29 PM, Szabolcs Nagy wrote:
> 
>> i think the sbrk in the ctor of the trace tool is not ok,
>> if there are malloc calls using brk before that ctor.
>> (makes the malloc heap non-contiguous.)
> 
> malloc has code to compensate for that.  Does it work?
> 

without looking into it, my guess is that the 'compensation'
has significant effect on malloc behaviour.

> We more or less have to support such use because we expose the sbrk
> interface.  (Some mallocs complete avoid using sbrk by default.)
> 
> Florian
>