From: Waiman Long <waiman.long@hp.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-arch@vger.kernel.org, riel@redhat.com, x86@kernel.org,
kvm@vger.kernel.org, scott.norton@hp.com,
raghavendra.kt@linux.vnet.ibm.com, paolo.bonzini@gmail.com,
oleg@redhat.com, linux-kernel@vger.kernel.org, mingo@redhat.com,
david.vrabel@citrix.com, hpa@zytor.com, luto@amacapital.net,
xen-devel@lists.xenproject.org, tglx@linutronix.de,
paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org,
boris.ostrovsky@oracle.com,
virtualization@lists.linux-foundation.org, doug.hatch@hp.com
Subject: Re: [PATCH 0/9] qspinlock stuff -v15
Date: Mon, 30 Mar 2015 12:43:39 -0400 [thread overview]
Message-ID: <55197D3B.4020701__12408.8093209595$1427733944$gmane$org@hp.com> (raw)
In-Reply-To: <20150330162933.GC23123@twins.programming.kicks-ass.net>
On 03/30/2015 12:29 PM, Peter Zijlstra wrote:
> On Mon, Mar 30, 2015 at 12:25:12PM -0400, Waiman Long wrote:
>> I did it differently in my PV portion of the qspinlock patch. Instead of
>> just waking up the CPU, the new lock holder will check if the new queue head
>> has been halted. If so, it will set the slowpath flag for the halted queue
>> head in the lock so as to wake it up at unlock time. This should eliminate
>> your concern of dong twice as many VMEXIT in an overcommitted scenario.
> We can still do that on top of all this right? As you might have
> realized I'm a fan of gradual complexity :-)
Of course. I am just saying that the concern can be addressed with some
additional code change.
-Longman
next prev parent reply other threads:[~2015-03-30 16:43 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-16 13:16 [PATCH 0/9] qspinlock stuff -v15 Peter Zijlstra
2015-03-16 13:16 ` 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 [this message]
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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