bug#45200: [PATCH] Force Glibc to free the memory freed

[Konstantin Kharlamov]

On Wed, 2021-02-03 at 14:36 -0500, DJ Delorie wrote:
> Konstantin Kharlamov <hi-angel@yandex.ru> writes:
> > > So I think we need more info: do the glibc maintainers consider it
> > > normal for glibc to behave this way?  Why does it behave this way?
> > 
> > Very good question! I hope Glibc mainainers that are on CC list will be able
> > to
> > answer.
> 
> The answers are "yes" and "performance".  Sorry.
> 

Thanks for chiming in. Let me rephrase a question of mine: right now, Glibc 
behaves in an odd way:

α) sometimes, call to `free()` frees memory completely
β) sometimes, call to `free()` leaves memory lingering forever, till 
malloc_trim is called additionally.

The answer I'd like to know is why do you not do always either α or always β? 
(I'm leaving out here the question of which way is correct and why, I'm rather 
curious just why the difference in behavior).