From: Peter Zijlstra <peterz@infradead.org> To: Waiman.Long@hp.com Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, peterz@infradead.org, paolo.bonzini@gmail.com, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, paulmck@linux.vnet.ibm.com, riel@redhat.com, torvalds@linux-foundation.org, raghavendra.kt@linux.vnet.ibm.com, david.vrabel@citrix.com, oleg@redhat.com, scott.norton@hp.com, doug.hatch@hp.com, linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, luto@amacapital.net Subject: [PATCH 0/9] qspinlock stuff -v15 Date: Mon, 16 Mar 2015 14:16:13 +0100 [thread overview] Message-ID: <20150316131613.720617163@infradead.org> (raw) Hi Waiman, As promised; here is the paravirt stuff I did during the trip to BOS last week. All the !paravirt patches are more or less the same as before (the only real change is the copyright lines in the first patch). The paravirt stuff is 'simple' and KVM only -- the Xen code was a little more convoluted and I've no real way to test that but it should be stright fwd to make work. I ran this using the virtme tool (thanks Andy) on my laptop with a 4x overcommit on vcpus (16 vcpus as compared to the 4 my laptop actually has) and it both booted and survived a hackbench run (perf bench sched messaging -g 20 -l 5000). So while the paravirt code isn't the most optimal code ever conceived it does work. Also, the paravirt patching includes replacing the call with "movb $0, %arg1" for the native case, which should greatly reduce the cost of having CONFIG_PARAVIRT_SPINLOCKS enabled on actual hardware. I feel that if someone were to do a Xen patch we can go ahead and merge this stuff (finally!). These patches do not implement the paravirt spinlock debug stats currently implemented (separately) by KVM and Xen, but that should not be too hard to do on top and in the 'generic' code -- no reason to duplicate all that. Of course; once this lands people can look at improving the paravirt nonsense.
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From: Peter Zijlstra <peterz@infradead.org> To: Waiman.Long@hp.com Cc: raghavendra.kt@linux.vnet.ibm.com, kvm@vger.kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, hpa@zytor.com, boris.ostrovsky@oracle.com, linux-arch@vger.kernel.org, x86@kernel.org, mingo@redhat.com, doug.hatch@hp.com, xen-devel@lists.xenproject.org, paulmck@linux.vnet.ibm.com, riel@redhat.com, konrad.wilk@oracle.com, scott.norton@hp.com, paolo.bonzini@gmail.com, tglx@linutronix.de, virtualization@lists.linux-foundation.org, oleg@redhat.com, luto@amacapital.net, david.vrabel@citrix.com, torvalds@linux-foundation.org Subject: [PATCH 0/9] qspinlock stuff -v15 Date: Mon, 16 Mar 2015 14:16:13 +0100 [thread overview] Message-ID: <20150316131613.720617163@infradead.org> (raw) Hi Waiman, As promised; here is the paravirt stuff I did during the trip to BOS last week. All the !paravirt patches are more or less the same as before (the only real change is the copyright lines in the first patch). The paravirt stuff is 'simple' and KVM only -- the Xen code was a little more convoluted and I've no real way to test that but it should be stright fwd to make work. I ran this using the virtme tool (thanks Andy) on my laptop with a 4x overcommit on vcpus (16 vcpus as compared to the 4 my laptop actually has) and it both booted and survived a hackbench run (perf bench sched messaging -g 20 -l 5000). So while the paravirt code isn't the most optimal code ever conceived it does work. Also, the paravirt patching includes replacing the call with "movb $0, %arg1" for the native case, which should greatly reduce the cost of having CONFIG_PARAVIRT_SPINLOCKS enabled on actual hardware. I feel that if someone were to do a Xen patch we can go ahead and merge this stuff (finally!). These patches do not implement the paravirt spinlock debug stats currently implemented (separately) by KVM and Xen, but that should not be too hard to do on top and in the 'generic' code -- no reason to duplicate all that. Of course; once this lands people can look at improving the paravirt nonsense.
next reply other threads:[~2015-03-16 13:36 UTC|newest] Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-03-16 13:16 Peter Zijlstra [this message] 2015-03-16 13:16 ` [PATCH 0/9] qspinlock stuff -v15 Peter Zijlstra 2015-03-16 13:16 ` [PATCH 1/9] qspinlock: A simple generic 4-byte queue spinlock Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 2/9] qspinlock, x86: Enable x86-64 to use " Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 3/9] qspinlock: Add pending bit Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 4/9] qspinlock: Extract out code snippets for the next patch Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 5/9] qspinlock: Optimize for smaller NR_CPUS Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 6/9] qspinlock: Use a simple write to grab the lock Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 7/9] qspinlock: Revert to test-and-set on hypervisors Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 8/9] qspinlock: Generic paravirt support Peter Zijlstra 2015-03-16 13:16 ` Peter Zijlstra 2015-03-18 20:50 ` Waiman Long 2015-03-19 10:12 ` Peter Zijlstra 2015-03-19 10:12 ` Peter Zijlstra 2015-03-19 10:12 ` Peter Zijlstra 2015-03-19 12:25 ` Peter Zijlstra 2015-03-19 12:25 ` Peter Zijlstra 2015-03-19 13:43 ` Peter Zijlstra 2015-03-19 13:43 ` Peter Zijlstra 2015-03-19 13:43 ` Peter Zijlstra 2015-03-19 23:25 ` Waiman Long 2015-03-19 23:25 ` Waiman Long 2015-03-19 23:25 ` Waiman Long 2015-04-01 16:20 ` Waiman Long 2015-04-01 16:20 ` Waiman Long 2015-04-01 16:20 ` Waiman Long 2015-04-01 17:12 ` Peter Zijlstra 2015-04-01 17:12 ` Peter Zijlstra 2015-04-01 17:12 ` Peter Zijlstra 2015-04-01 17:42 ` Peter Zijlstra 2015-04-01 17:42 ` Peter Zijlstra 2015-04-01 18:17 ` Peter Zijlstra 2015-04-01 18:17 ` Peter Zijlstra 2015-04-01 18:54 ` Waiman Long 2015-04-01 18:54 ` Waiman Long 2015-04-01 18:48 ` Peter Zijlstra 2015-04-01 18:48 ` Peter Zijlstra 2015-04-01 19:58 ` Waiman Long 2015-04-01 21:03 ` Peter Zijlstra 2015-04-01 21:03 ` Peter Zijlstra 2015-04-01 21:03 ` Peter Zijlstra 2015-04-02 16:28 ` Waiman Long 2015-04-02 17:20 ` Peter Zijlstra 2015-04-02 17:20 ` Peter Zijlstra 2015-04-02 19:48 ` Peter Zijlstra 2015-04-02 19:48 ` Peter Zijlstra 2015-04-03 3:39 ` Waiman Long 2015-04-03 3:39 ` Waiman Long 2015-04-03 3:39 ` Waiman Long 2015-04-03 13:43 ` Peter Zijlstra 2015-04-03 13:43 ` Peter Zijlstra 2015-04-03 13:43 ` Peter Zijlstra 2015-04-02 19:48 ` Peter Zijlstra 2015-04-02 17:20 ` Peter Zijlstra 2015-04-02 16:28 ` Waiman Long 2015-04-02 16:28 ` Waiman Long 2015-04-01 19:58 ` Waiman Long 2015-04-01 19:58 ` Waiman Long 2015-04-01 18:48 ` Peter Zijlstra 2015-04-01 18:54 ` Waiman Long 2015-04-01 18:17 ` Peter Zijlstra 2015-04-01 17:42 ` Peter Zijlstra 2015-04-01 20:10 ` Waiman Long 2015-04-01 20:10 ` Waiman Long 2015-04-01 20:10 ` Waiman Long 2015-03-19 12:25 ` Peter Zijlstra 2015-03-18 20:50 ` Waiman Long 2015-03-16 13:16 ` Peter Zijlstra 2015-03-16 13:16 ` [PATCH 9/9] qspinlock, x86, kvm: Implement KVM support for paravirt qspinlock Peter Zijlstra 2015-03-16 13:16 ` [PATCH 9/9] qspinlock,x86,kvm: " Peter Zijlstra 2015-03-16 13:16 ` [PATCH 9/9] qspinlock, x86, kvm: " Peter Zijlstra 2015-03-19 2:45 ` Waiman Long 2015-03-19 10:01 ` Peter Zijlstra 2015-03-19 10:01 ` [PATCH 9/9] qspinlock,x86,kvm: " Peter Zijlstra 2015-03-19 10:01 ` Peter Zijlstra 2015-03-19 21:08 ` [PATCH 9/9] qspinlock, x86, kvm: " Waiman Long 2015-03-19 21:08 ` [PATCH 9/9] qspinlock,x86,kvm: " Waiman Long 2015-03-19 21:08 ` [PATCH 9/9] qspinlock, x86, kvm: " Waiman Long 2015-03-20 7:43 ` Raghavendra K T 2015-03-20 7:43 ` [PATCH 9/9] qspinlock,x86,kvm: " Raghavendra K T 2015-03-20 7:43 ` [PATCH 9/9] qspinlock, x86, kvm: " Raghavendra K T 2015-03-19 2:45 ` Waiman Long 2015-03-16 14:08 ` [PATCH 0/9] qspinlock stuff -v15 David Vrabel 2015-03-16 14:08 ` [Xen-devel] " David Vrabel 2015-03-16 14:08 ` David Vrabel 2015-03-16 14:08 ` David Vrabel 2015-03-16 14:08 ` David Vrabel 2015-03-18 20:36 ` Waiman Long 2015-03-18 20:36 ` Waiman Long 2015-03-18 20:36 ` Waiman Long 2015-03-19 18:01 ` [Xen-devel] " David Vrabel 2015-03-19 18:01 ` David Vrabel 2015-03-19 18:01 ` David Vrabel 2015-03-19 18:32 ` Peter Zijlstra 2015-03-19 18:32 ` Peter Zijlstra 2015-03-19 18:32 ` Peter Zijlstra 2015-03-19 18:01 ` David Vrabel 2015-03-25 19:47 ` Konrad Rzeszutek Wilk 2015-03-26 20:21 ` Peter Zijlstra 2015-03-26 20:21 ` Peter Zijlstra 2015-03-26 20:21 ` Peter Zijlstra 2015-03-27 14:07 ` Konrad Rzeszutek Wilk 2015-03-27 14:07 ` Konrad Rzeszutek Wilk 2015-03-27 14:07 ` Konrad Rzeszutek Wilk 2015-03-30 16:41 ` Waiman Long 2015-03-30 16:41 ` Waiman Long 2015-03-30 16:41 ` Waiman Long 2015-03-30 16:25 ` Waiman Long 2015-03-30 16:25 ` Waiman Long 2015-03-30 16:29 ` Peter Zijlstra 2015-03-30 16:29 ` Peter Zijlstra 2015-03-30 16:43 ` Waiman Long 2015-03-30 16:43 ` Waiman Long 2015-03-30 16:43 ` Waiman Long 2015-03-30 16:29 ` Peter Zijlstra 2015-03-30 16:25 ` Waiman Long 2015-03-25 19:47 ` Konrad Rzeszutek Wilk 2015-03-25 19:47 ` Konrad Rzeszutek Wilk 2015-03-27 6:40 ` Raghavendra K T 2015-03-27 6:40 ` Raghavendra K T 2015-03-27 6:40 ` Raghavendra K T -- strict thread matches above, loose matches on Subject: below -- 2015-03-16 13:16 Peter Zijlstra
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