Date: Thu, 29 Jul 2004 13:30:21 -0600 (MDT) From: Scott Long <scottl@freebsd.org> To: Alan Cox <alc@freebsd.org> Cc: cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/alpha/alpha pmap.c src/sys/amd64/amd64pmap.c src/sys/i386/i386 pmap.c src/sys/vm vm_page.c Message-ID: <20040729131040.F32601@pooker.samsco.org> In-Reply-To: <200407291856.i6TIuV6A051279@repoman.freebsd.org> References: <200407291856.i6TIuV6A051279@repoman.freebsd.org>
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On Thu, 29 Jul 2004, Alan Cox wrote: > alc 2004-07-29 18:56:31 UTC > > FreeBSD src repository > > Modified files: > sys/alpha/alpha pmap.c > sys/amd64/amd64 pmap.c > sys/i386/i386 pmap.c > sys/vm vm_page.c > Log: > Advance the state of pmap locking on alpha, amd64, and i386. > > - Enable recursion on the page queues lock. This allows calls to > vm_page_alloc(VM_ALLOC_NORMAL) and UMA's obj_alloc() with the page > queues lock held. Such calls are made to allocate page table pages > and pv entries. My understanding is that recursive mutexes are quite expensive. Is recursion a common occurrance now, and is there a good way to profile/measure these paths? Scott
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