>> complaining to lack the "malloc_usable_size ()" system call.
> If we ever want to get this into pkgsrc, DO NOT USE THAT CALL.  It is
> completely bogus exposure of malloc internals.

It is?  I don't see what's wrong with it.  Any malloc implementation
could add it, if necessary by simply always returning the size passed
to malloc for the block in question.  I don't see it as the least bit
unreasonable to have a call that says "okay, you're allowed to allocate
more than I asked for; tell me how much you actually allocated".

(Why is this on tech-kern@?  malloc is a userland thing....)

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