Date: Fri, 30 Dec 2005 09:04:12 -0500 From: John Baldwin <jhb@freebsd.org> To: Pawel Jakub Dawidek <pjd@freebsd.org> Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern kern_malloc.c src/sys/sys malloc.h src/sys/vm memguard.c memguard.h Message-ID: <200512300904.14227.jhb@freebsd.org> In-Reply-To: <20051230134215.GE779@garage.freebsd.pl> References: <200512301145.jBUBj7fW043290@repoman.freebsd.org> <200512300815.57417.jhb@freebsd.org> <20051230134215.GE779@garage.freebsd.pl>
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On Friday 30 December 2005 08:42 am, Pawel Jakub Dawidek wrote: > On Fri, Dec 30, 2005 at 08:15:56AM -0500, John Baldwin wrote: > +> On Friday 30 December 2005 06:45 am, Pawel Jakub Dawidek wrote: > +> > pjd 2005-12-30 11:45:07 UTC > +> > > +> > FreeBSD src repository > +> > > +> > Modified files: > +> > sys/kern kern_malloc.c > +> > sys/sys malloc.h > +> > sys/vm memguard.c memguard.h > +> > Log: > +> > Improve memguard a bit: > +> > - Provide tunable vm.memguard.desc, so one can specify memory type > +> > without changing the code and recompiling the kernel. > +> > - Allow to use memguard for kernel modules by providing sysctl > +> > vm.memguard.desc, which can be changed to short description of > memory +> > type before module is loaded. > +> > +> You don't actually need a sysctl for this case. You can use kenv to s= et > a +> tunable after boot but before loading the module to achieve the same > purpose. +> E.g. 'kenv vm.memguard.desc=3DFOO' will work and TUNABLE_FET= CH > will find it +> during a subsequent kldload. Just FYI. > > But I need to control vm.memguard.desc change to be able to detect if > memory type has allocated memory already, etc. and eventually deny the > change. > AFAIK it won't be possible with kenv. =46or the case I quoted (_before_ kldload) you must be doing all that check= ing=20 when you load the module either via MOD_LOAD in a module event or a SYSINIT= =2E =20 In that case, setting the tunable via kenv before you kldload is identical = to=20 setting the tunable in the loader, then booting and then kldloading the=20 module. =2D-=20 John Baldwin <jhb@FreeBSD.org> =A0<>< =A0http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =A0=3D =A0http://www.FreeBSD.org
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