On Mon, Apr 25, 2011 at 5:15 PM, Bob Hall <[email protected]> wrote: > On Mon, Apr 25, 2011 at 03:18:46PM +0100, RW wrote: >> I don't believe the heap is allocated zeroed pages. The kernel >> does allocate such pages to the BSS segment, but that's because it >> holds zeroed data such as C static variables. > > According to McKusick and Neville-Neil's book on FreeBSD, sbrk extends > the uninitialized data segment with zero-filled pages. Since malloc() is > an interface to sbrk, it does the same thing.
True, except that malloc(3) now uses both sbrk(2) and mmap(2) allocators, depending on the user-settable flags in /etc/malloc.conf, MALLOC_OPTIONS and the global variable _malloc_options. So you have to look into mmap(2) too. -cpghost. -- Cordula's Web. http://www.cordula.ws/ _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[email protected]"
