Date: Wed, 6 Dec 2000 13:39:46 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Remy Nonnenmacher <remy@boostworks.com> Cc: phk@critter.freebsd.dk, freebsd-hackers@FreeBSD.ORG Subject: Re: free() not freing pagedirs pages. Message-ID: <200012062139.eB6LdkE99051@earth.backplane.com> References: <200012061907.UAA31917@luxren2.boostworks.com>
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:OK. In fact my problem was just a printf that allocated a buffer via
:__smakebuf at the very last moment (when all memory was allocated).
:This prevent free() to give back all previous pages up to this one. The
:problem was _not_ in malloc.c.
:
:Anyway, i learned a lot from hacking the source to catch the caller.
:Thanks.
:
:RN.
:IhM
Not to mention library routines which might malloc() something and
keep it around.
I find that the best way to allocate a large chunk of memory is to
use mmap( ... MAP_ANON ... ). That way you have complete control
over the memory. You need only page-align the request size
(getpagesize() helps there). You can then manage the memory with
madvise(), and free it completely with munmap().
-Matt
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