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

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Message-Id: <fc736e13-17f4-6f7a-2c0d-366950e96bab@de.ibm.com>
Date:   Wed, 31 Jul 2019 09:16:58 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Paolo Bonzini <pbonzini@...hat.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 21:06, Paolo Bonzini wrote:
> 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?

No its not bad, but certainly something to improve if time allows.