talloc vs malloc speed

Andreas Schneider asn at samba.org
Mon Apr 17 18:18:04 UTC 2023

On Monday, 17 April 2023 13:07:59 CEST Florian Weimer via samba-technical 
> * Andreas Schneider:
> > Yes, we have support for destructor callbacks. Can you point me to the
> > attributes which might help talloc?
> I think of those listed here
>   <https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html>
> alloc_align, alloc_size, malloc, nothrow, returns_nonnull are relevant,
> but not all them might be appropriate due to the way talloc works.

I've started to look into them, thanks!

The returns_nonnull did recognizable improvements to talloc pool().
Using alloc_size leads to a lot of reports. As soon we access the talloc 
header it detects out of bounds access :-)

The malloc attribute can be set to a few functions, that helps. I use the 
attribute with the deallocator to avoid issue on free with destructors.

The documentation for nothrow is a bit short. What is an exception in C?

Andreas Schneider                      asn at samba.org
Samba Team                             www.samba.org
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