linux-kernel - Re: [PATCH 2/2] KVM: selftests: Enable dirty_log

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Date:   Tue, 30 Jul 2019 21:06:03 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Huth <thuth@...hat.com>, kvm@...r.kernel.org,
        Janosch Frank <frankja@...ux.ibm.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH 2/2] KVM: selftests: Enable dirty_log_test on s390x

On 30/07/19 16:57, Christian Borntraeger wrote:
> While this fixes the test (and the migration does work fine), it still
> means that s390x overindicates the dirty bit for sparsely populated
> 1M segments. It is just a performance issue, but maybe we should try 
> to get this fixed. Not sure what to do here to remember us about this, 
> adding this as expected fail?

if it's only on the first access after enabling dirty logging, that
shouldn't be that bad?

Paolo