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

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Message-ID: <20160929101040.GV5016@twins.programming.kicks-ass.net>
Date:   Thu, 29 Sep 2016 12:10:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Cc:     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
Subject: Re: [PATCH v3 0/4] implement vcpu preempted check

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.