Messages in this thread | | | Date | Tue, 21 Mar 2000 12:43:55 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: Some questions about linux kernel. |
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On Tue, 21 Mar 2000, Matthew Kirkwood wrote:
> On Tue, 21 Mar 2000, Richard B. Johnson 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. > > > malloc(0x1000); > > glibc's malloc() will use mmap() only to allocate large lumps. > (Currently the default is 128Kb or larger, I think.) > Correct. Many, in fact what looks like all, page-size chunks are allocated using break. Try it and see. The 'set-break' goes on forever.....
Cheers, Dick Johnson
Penguin : Linux version 2.3.41 on an i686 machine (800.63 BogoMips).
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