Date: Fri, 6 Jan 2006 14:26:12 -0500 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: cvs-src@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/kern kern_mutex.c kern_sx.c subr_witness.c src/sys/sys _lock.h lock.h Message-ID: <200601061426.13700.jhb@freebsd.org> In-Reply-To: <200601061807.k06I7WHQ034800@repoman.freebsd.org> References: <200601061807.k06I7WHQ034800@repoman.freebsd.org>
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On Friday 06 January 2006 01:07 pm, John Baldwin wrote: > jhb 2006-01-06 18:07:32 UTC > > FreeBSD src repository > > Modified files: > sys/kern kern_mutex.c kern_sx.c subr_witness.c > sys/sys _lock.h lock.h > Log: > Trim another pointer from struct lock_object (and thus from struct mtx > and struct sx). Instead of storing a direct pointer to a our lock_class > struct in lock_object, reserve 4 bits in the lo_flags field to serve as an > index into a global lock_classes array that contains pointers to the lock > classes. Only debugging code such as WITNESS or INVARIANTS checks and KTR > logging need to access the lock_class member, so this shouldn't add any > overhead to production kernels. It might add some slight overhead to > kernels using those debug options however. > > As with the previous set of changes to lock_object, this is going to > completely obliterate the kernel ABI, so be sure to recompile all your > modules. Forgot: Tested on: alpha, amd64, i386, sparc64 -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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