From: Wanpeng Li <kernellwp@gmail.com>
To: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linuxppc-dev@lists.ozlabs.org,
virtualization@lists.linux-foundation.org,
linux-s390 <linux-s390@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
mpe@ellerman.id.au, Paul Mackerras <paulus@samba.org>,
benh@kernel.crashing.org,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
Waiman Long <waiman.long@hpe.com>,
will.deacon@arm.com, boqun.feng@gmail.com,
Davidlohr Bueso <dave@stgolabs.net>,
schwidefsky@de.ibm.com
Subject: Re: [PATCH v2 2/4] powerpc/spinlock: support vcpu preempted check
Date: Tue, 5 Jul 2016 17:57:56 +0800 [thread overview]
Message-ID: <CANRm+CxQMSrg69p2Xey829Mz4Au9YCai+4JD17i9urdbj0VgkQ@mail.gmail.com> (raw)
In-Reply-To: <1467124991-13164-3-git-send-email-xinhui.pan@linux.vnet.ibm.com>
Hi Xinhui,
2016-06-28 22:43 GMT+08:00 Pan Xinhui <xinhui.pan@linux.vnet.ibm.com>:
> This is to fix some lock holder preemption issues. Some other locks
> implementation do a spin loop before acquiring the lock itself. Currently
> kernel has an interface of bool vcpu_is_preempted(int cpu). It take the cpu
> as parameter and return true if the cpu is preempted. Then kernel can break
> the spin loops upon on the retval of vcpu_is_preempted.
>
> As kernel has used this interface, So lets support it.
>
> Only pSeries need supoort it. And the fact is powerNV are built into same
> kernel image with pSeries. So we need return false if we are runnig as
> powerNV. The another fact is that lppaca->yiled_count keeps zero on
> powerNV. So we can just skip the machine type.
Lock holder vCPU preemption can be detected by hardware pSeries or
paravirt method?
Regards,
Wanpeng Li
next prev parent reply other threads:[~2016-07-05 9:57 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-28 14:43 [PATCH v2 0/4] implement vcpu preempted check Pan Xinhui
2016-06-28 14:43 ` [PATCH v2 1/4] kernel/sched: introduce vcpu preempted check interface Pan Xinhui
2016-06-28 14:43 ` [PATCH v2 2/4] powerpc/spinlock: support vcpu preempted check Pan Xinhui
2016-07-05 9:57 ` Wanpeng Li [this message]
2016-07-06 4:58 ` xinhui
2016-07-06 6:46 ` Wanpeng Li
2016-07-06 7:58 ` Peter Zijlstra
2016-07-06 8:32 ` Wanpeng Li
2016-07-06 10:18 ` xinhui
2016-07-06 10:54 ` Balbir Singh
2016-07-15 15:35 ` Pan Xinhui
2016-06-28 14:43 ` [PATCH v2 3/4] locking/osq: Drop the overload of osq_lock() Pan Xinhui
2016-06-28 14:43 ` [PATCH v2 4/4] kernel/locking: Drop the overload of {mutex, rwsem}_spin_on_owner Pan Xinhui
2016-07-06 6:52 ` [PATCH v2 0/4] implement vcpu preempted check Peter Zijlstra
2016-07-06 7:47 ` Juergen Gross
2016-07-06 8:19 ` Peter Zijlstra
2016-07-06 8:38 ` Juergen Gross
2016-07-06 12:44 ` Paolo Bonzini
2016-07-06 16:56 ` Christian Borntraeger
2016-07-06 10:05 ` xinhui
2016-07-06 10:44 ` Paolo Bonzini
2016-07-06 11:59 ` Peter Zijlstra
2016-07-06 12:08 ` Wanpeng Li
2016-07-06 12:28 ` Paolo Bonzini
2016-07-06 13:03 ` Wanpeng Li
2016-07-07 8:48 ` Wanpeng Li
2016-07-07 9:42 ` Peter Zijlstra
2016-07-07 10:12 ` Wanpeng Li
2016-07-07 10:27 ` Wanpeng Li
2016-07-07 11:15 ` Peter Zijlstra
2016-07-07 11:08 ` Peter Zijlstra
2016-07-07 11:09 ` Peter Zijlstra
2016-07-07 11:21 ` Peter Zijlstra
2016-07-11 15:10 ` Waiman Long
2016-07-12 4:16 ` Juergen Gross
2016-07-12 18:16 ` Waiman Long
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