Date: Tue, 22 Oct 2002 12:30:04 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: Danny Braniss <danny@cs.huji.ac.il>, Poul-Henning Kamp <phk@critter.freebsd.dk>, freebsd-hackers@FreeBSD.ORG Subject: Re: malloc Message-ID: <3DB5A73C.20513D50@mindspring.com> References: <E183u5Y-0003Yc-00@cse.cs.huji.ac.il> <3DB50A5A.F87EDA78@mindspring.com> <20021022153347.GA92973@dan.emsphone.com>
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Dan Nelson wrote: > > The FreeBSD malloc uses anonymous pages mmap'ed off of /dev/zero. > > > > The Linux malloc uses pages added to the process address space via a > > call to sbrk. > > Actually, on FreeBSD only the page directory is mmap'ed. Data returned > to the user is allocated via sbrk. Please see: /usr/src/lib/libc/stdlib/malloc.c The only calls to sbrk have a 0 argument. This is only used to find the segment end, so that the mmap's do not occur over top of anything important. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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