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Message-ID: <20150307185954.GB15033@agordeev.usersys.redhat.com> Date: Sat, 7 Mar 2015 18:59:54 +0000 From: Alexander Gordeev <agordeev@...hat.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/9] rcu: Cleanup rcu_init_geometry() code and arithmetics On Sat, Mar 07, 2015 at 10:08:21AM -0800, Paul E. McKenney wrote: > The rest of this series looks promising, but I do have to ask... How have > you tested these? The most straightforward approach would be to find I tried trees with 1,2 and 3 levels on a 160-CPU machine + dozens of kernel builds with 'make -j160'. I feel bit guilty I did not try the corner case with 4 levels, but run-time-wise it is not really differ from what I done. Do you expect the below is a better option? > a KVM-capable system with at least 16 CPUs and type the following from > the top-level directory: > > sh tools/testing/selftests/rcutorture/bin/kvm.sh --cpus 34 --duration 5 > > This will do a series of 16 build-boot-test cycles with various configs > (including various rcu_node tree shapes), and print a summary of the > outcome at the end. > > For these sorts of changes, I usually also do some user-level testing. -- Regards, Alexander Gordeev agordeev@...hat.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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