linux-kernel - Re: [PATCH v3 0/4] implement vcpu preempted check

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Message-Id: <496ba299-1f1d-e98b-7827-f861eeea5558@linux.vnet.ibm.com>
Date:   Fri, 30 Sep 2016 13:03:34 +0800
From:   Pan Xinhui <xinhui@...ux.vnet.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        virtualization@...ts.linux-foundation.org,
        linux-s390@...r.kernel.org, xen-devel-request@...ts.xenproject.org,
        kvm@...r.kernel.org, benh@...nel.crashing.org, paulus@...ba.org,
        mpe@...erman.id.au, mingo@...hat.com, paulmck@...ux.vnet.ibm.com,
        will.deacon@....com, kernellwp@...il.com, jgross@...e.com,
        pbonzini@...hat.com, bsingharora@...il.com,
        Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: [PATCH v3 0/4] implement vcpu preempted check



在 2016/9/29 18:31, Peter Zijlstra 写道:
> On Thu, Sep 29, 2016 at 12:23:19PM +0200, Christian Borntraeger wrote:
>> On 09/29/2016 12:10 PM, Peter Zijlstra wrote:
>>> On Thu, Jul 21, 2016 at 07:45:10AM -0400, Pan Xinhui wrote:
>>>> change from v2:
>>>> 	no code change, fix typos, update some comments
>>>>
>>>> change from v1:
>>>> 	a simplier definition of default vcpu_is_preempted
>>>> 	skip mahcine type check on ppc, and add config. remove dedicated macro.
>>>> 	add one patch to drop overload of rwsem_spin_on_owner and mutex_spin_on_owner.
>>>> 	add more comments
>>>> 	thanks boqun and Peter's suggestion.
>>>>
>>>> This patch set aims to fix lock holder preemption issues.
>>>
>>> So I really like the concept, but I would also really like to see
>>> support for more hypervisors included before we can move forward with
>>> this.
>>>
>>> Please consider s390 and (x86/arm) KVM. Once we have a few, more can
>>> follow later, but I think its important to not only have PPC support for
>>> this.
>>
>> Actually the s390 preemted check via sigp sense running  is available for
>> all hypervisors (z/VM, LPAR and KVM) which implies everywhere as you can no
>> longer buy s390 systems without LPAR.
>>
>> As Heiko already pointed out we could simply use a small inline function
>> that calls cpu_is_preempted from arch/s390/lib/spinlock (or smp_vcpu_scheduled from smp.c)
>
> Sure, and I had vague memories of Heiko's email. This patch set however
> completely fails to do that trivial hooking up.
>

sorry for that.
I will try to work it out on x86.

Hi, Will
	I appreciate that if you or some other arm guys could help on it. :)