Date: Sat, 21 Aug 2004 23:49:36 -0500 From: Alan Cox <alc@cs.rice.edu> To: Robert Watson <rwatson@FreeBSD.org> Cc: cvs-src@FreeBSD.org Subject: Re: cvs commit: src/sys/vm vm_fault.c Message-ID: <20040822044936.GJ9106@cs.rice.edu> In-Reply-To: <Pine.NEB.3.96L.1040822001718.95496H-100000@fledge.watson.org> References: <20040822041018.GA937@green.homeunix.org> <Pine.NEB.3.96L.1040822001718.95496H-100000@fledge.watson.org>
index | next in thread | previous in thread | raw e-mail
On Sun, Aug 22, 2004 at 12:18:49AM -0400, Robert Watson wrote: > > On Sun, 22 Aug 2004, Brian Fundakowski Feldman wrote: > > > Also, it was the system_map lock, so it was a mutex, not an sx. > > > > /Goes back to trying to figure out wtf portupgrade -rR kde\* keeps > > causing > > hangs, but only in X, not at the command line, and not seemingly > > dependant on AGP/X driver. > > I believe mutexes are alright also as long as you're careful about > sleeping and lock order. I.e., don't sleep while holding a > non-funnel-like mutex, etc. > We should never page fault on a system map. If that happens to you, it indicates an error. (In-kernel maps on which we do page fault, such as the pipe submap, are treated the same as user maps and utilize an sx lock.) Alanhome | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040822044936.GJ9106>