Date: Tue, 20 Dec 2011 15:31:48 +0100 (CET) From: "Ganael LAPLANCHE" <ganael.laplanche@martymac.org> To: Andriy Gapon <avg@FreeBSD.org>, Tijl Coosemans <tijl@coosemans.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: Using mmap(2) with a hint address Message-ID: <20111220142740.M29405@martymac.org> In-Reply-To: <20111220134716.M62917@martymac.org> References: <20111220080437.M63044@martymac.org> <4EF05F27.8030902@FreeBSD.org> <20111220134716.M62917@martymac.org>
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On Tue, 20 Dec 2011 15:02:01 +0100 (CET), Ganael LAPLANCHE wrote > But there is still something I don't understand : on the Linux > machine where I ran my test program, the current RLIMIT_DATA > is set to 0xffffffff/0xffffffff and I can manage to mmap at > address 0x20000000. If I set the same limit on FreeBSD, I > won't get the mapping at 0x20000000. So, there *is* a > difference of behaviour between the two systems, but I don't > understand why. Well, in fact, two things remain not very clear for me : - Why are mmap()s performed *after* data segment ? => It seems they can go within, on GNU/Linux and NetBSD. - Why do we have such a default value for datasize (8.2, amd64) : $ limits Resource limits (current): cputime infinity secs filesize infinity kB datasize 33554432 kB this is HUGE ! -- Ganael LAPLANCHE <ganael.laplanche@martymac.org> http://www.martymac.org | http://contribs.martymac.org FreeBSD: martymac <martymac@FreeBSD.org>, http://www.FreeBSD.org
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