GNU bug report logs - #45200
Wishlist: There should be a `malloc-trim' function

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From: DJ Delorie <dj <at> redhat.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: carlos <at> redhat.com, rudalics <at> gmx.at, fweimer <at> redhat.com, 45200 <at> debbugs.gnu.org, hi-angel <at> yandex.ru
Subject: bug#45200: [PATCH] Force Glibc to free the memory freed
Date: Wed, 03 Feb 2021 14:30:56 -0500

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:
> I'm not sure I follow: if I were to implement a malloc library, calls to
> `free` would be exactly the place where I'd decide that some memory
> should be returned to the OS,

Heh.  malloc() and free() are on the hot path for many time-critical
things; if you wasted time in free() when you didn't have to, people
would complain.  *This* is the tradeoff we (glibc devs) have to make -
performance vs footprint.  Gaining even a few percent in a malloc/free
benchmark is a *huge* win for some folks.

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