Date: Fri, 04 Jan 2008 12:57:11 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Andrey Chernov <ache@nagual.pp.ru> Cc: freebsd-current@FreeBSD.ORG, Jason Evans <jasone@FreeBSD.ORG> Subject: Re: sbrk(2) broken Message-ID: <5705.1199451431@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 04 Jan 2008 15:21:50 %2B0300." <20080104122149.GA17103@nagual.pp.ru>
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In message <20080104122149.GA17103@nagual.pp.ru>, Andrey Chernov writes: >On Wed, Jan 02, 2008 at 10:38:40PM -0800, Jason Evans wrote: >> Poul-Henning noticed today that xchat fails to start if malloc uses sbrk >> internally. > >Malloc() itself knows about memory amount _really_ in use by a program [...] No, the VM system has a much better idea about this. You need to think about this the right way: There is address space allocated to the process (via sbrk/mmap) A subset of this, is address space allocated by the program (via malloc) ...and then there is memory actually in use, which is an entirely different thing, of which we currently only have some kind of clue in the VM system. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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