Date: Sat, 11 Jan 2003 10:31:21 -0800 From: "David O'Brien" <dev-null@NUXI.com> To: Archie Cobbs <archie@dellroad.org> Cc: freebsd-arch@freebsd.org Subject: Re: Virtual memory question Message-ID: <20030111183121.GA71528@dragon.nuxi.com> In-Reply-To: <200301110200.h0B20rUC024725@arch20m.dellroad.org> References: <200301110200.h0B20rUC024725@arch20m.dellroad.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On Fri, Jan 10, 2003 at 06:00:53PM -0800, Archie Cobbs wrote: > BTW this idea was spawned by this text in the sbrk(3) man page: > > The brk() and sbrk() functions are legacy interfaces from > before the advent of modern virtual memory management. > > Along those lines, why does our malloc(3) library use sbrk(3) instead > of mmap(), which would enable returning free pages back to the system > more readily (since the pages would not have to be contiguous)? See the glibc malloc(3) [which started with libdlmalloc] or the libdlmalloc port. It uses the heap (sbrk(3)) for small allocations, and mmap() for larger ones. The threashold is tunable. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20030111183121.GA71528>