Date: Fri, 20 Jan 2012 11:57:42 +1100 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Dieter BSD <dieterbsd@engineer.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Giant lock gone? (was: Re: ...focus, longevity, and lifecycle) Message-ID: <20120120005742.GC41280@dereel.lemis.com> In-Reply-To: <20120119005820.218250@gmx.com> References: <20120119005820.218250@gmx.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--qtZFehHsKgwS5rPz Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wednesday, 18 January 2012 at 19:58:19 -0500, Dieter BSD wrote: >> The original goal for 5.0 was to completely remove the Giant lock (and >> do other cool SMP-related stuff). Eventually it was realized that this >> was too big a goal to fully accomplish in 5.0 (albeit too late in the >> process) and the goal was changed to do the basic framework for the new >> SMP model; and lay the groundwork for "some things run under Giant for >> now, and we'll remove it from them ASAP." That actually turned out to >> last through 6, making 7 the realization of what 5.0 was supposed to be. > > So you are saying that the Giant lock was completely removed in 7.0? Giant is still there in 9.0. It's a pity you didn't say who you were quoting there. To my knowledge we never intended to completely remove Giant in 5.x. We realised from the start that it would take a long time. See http://www.lemis.com/grog/diary-jun2000.php for what we decided 12 years ago. Point 6 suggests removing the "Giant Kernel Spinlock", but that is misleading. We did that, and we gave the name Giant to the "blocking mutex for the kernel". Previously Giant didn't have a name, because it was the only one. Greg -- Sent from my desktop computer Finger grog@FreeBSD.org for PGP public key. See complete headers for address and phone numbers. This message is digitally signed. If your Microsoft MUA reports problems, please read http://tinyurl.com/broken-mua --qtZFehHsKgwS5rPz Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (FreeBSD) iEYEARECAAYFAk8YvAYACgkQIubykFB6QiMvIQCeJG27exCl4f899zmB+tGy42PR K+wAn3use1P01BSC7CYavchCMgIFdMmK =XaTK -----END PGP SIGNATURE----- --qtZFehHsKgwS5rPz--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20120120005742.GC41280>