Re: Some questions about linux kernel.

From: George (
Date: Tue Mar 21 2000 - 08:09:36 EST

On Tue, 21 Mar 2000, Richard B. Johnson wrote:

>On Tue, 21 Mar 2000, Alan Cox wrote:
>> > Malloc(), as stated before, just sets a new break address when it
>> > runs out of heap. It keeps track of the heap, but not very carefully.
>> Not any more. Modern mallocs are a lot smarter. They also use mmap for
>> their backing store
>Certainly not the C runtime library distributed by RedHat.

There's a limit to the size. If you allocated 1,024 bytes it wouldn't be
worth the mmap(). Check out malloc.h for M_MMAP_THRESHOLD and mallopt().
I can't remember the number off-hand.

-George Greer

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