Date: Wed, 30 Nov 2005 22:51:52 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-current@freebsd.org Cc: Poul-Henning Kamp <phk@phk.freebsd.dk>, Jason Evans <jasone@canonware.com>, current@freebsd.org Subject: Re: New libc malloc patch Message-ID: <200511302252.05741.doconnor@gsoft.com.au> In-Reply-To: <6861.1133349506@critter.freebsd.dk> References: <6861.1133349506@critter.freebsd.dk>
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--nextPart3804233.csohxlyASA Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Wed, 30 Nov 2005 21:48, Poul-Henning Kamp wrote: > In message <20051130111017.GA67032@galgenberg.net>, Ulrich Spoerlein writ= es: > >I just read that mmap() part and have to wonder: Is it possible to > >introduce something like the guard pages that OpenBSD has implemented? > >I'd love to try this out and see the dozens of applications that fail > >due to off-by-one bugs. > > Guard-pages are very expensive and that is why I have not adopted > OpenBSD's patch. > > I would advocate that people use one of the dedicated debugging malloc > implementations (ElectricFence ?) instead of putting too much overhead > into our default malloc. Electric fence is right. Although it IS slow, an order of magnitude or more= =20 usually. Also if you do use it you'll probably have to bump up the=20 vm.max_proc_mmap sysctl or it will fail to allocate memory. Another good one is valgrind (and it detects more problems to boot :) > For all practical purposes, the options J, A, X & Z are the most commonly > used. =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart3804233.csohxlyASA Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDjZlt5ZPcIHs/zowRAnhxAKCp2p5SYlq0IC2fB4xM+I/lSW0XAQCeIApz HTETzLR6SBVsz4evY6IcZbk= =4c4c -----END PGP SIGNATURE----- --nextPart3804233.csohxlyASA--
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