linux-kernel - Re: [PATCH 0/5] Add a dirty logging performance test

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Message-ID: <20201109092117.n3b4socvehku4mwc@kamzik.brq.redhat.com>
Date:   Mon, 9 Nov 2020 10:21:17 +0100
From:   Andrew Jones <drjones@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Ben Gardon <bgardon@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Thomas Huth <thuth@...hat.com>,
        Peter Feiner <pfeiner@...gle.com>
Subject: Re: [PATCH 0/5] Add a dirty logging performance test

On Fri, Nov 06, 2020 at 01:48:29PM +0100, Paolo Bonzini wrote:
> On 28/10/20 00:37, Ben Gardon wrote:
> > Currently KVM lacks a simple, userspace agnostic, performance benchmark for
> > dirty logging. Such a benchmark will be beneficial for ensuring that dirty
> > logging performance does not regress, and to give a common baseline for
> > validating performance improvements. The dirty log perf test introduced in
> > this series builds on aspects of the existing demand paging perf test and
> > provides time-based performance metrics for enabling and disabling dirty
> > logging, getting the dirty log, and dirtying memory.
> > 
> > While the test currently only has a build target for x86, I expect it will
> > work on, or be easily modified to support other architectures.
> > 
> > Ben Gardon (5):
> >    KVM: selftests: Factor code out of demand_paging_test
> >    KVM: selftests: Remove address rounding in guest code
> >    KVM: selftests: Simplify demand_paging_test with timespec_diff_now
> >    KVM: selftests: Add wrfract to common guest code
> >    KVM: selftests: Introduce the dirty log perf test
> > 
> >   tools/testing/selftests/kvm/.gitignore        |   1 +
> >   tools/testing/selftests/kvm/Makefile          |   1 +
> >   .../selftests/kvm/demand_paging_test.c        | 230 ++---------
> >   .../selftests/kvm/dirty_log_perf_test.c       | 382 ++++++++++++++++++
> >   .../selftests/kvm/include/perf_test_util.h    | 192 +++++++++
> >   .../testing/selftests/kvm/include/test_util.h |   2 +
> >   tools/testing/selftests/kvm/lib/test_util.c   |  22 +-
> >   7 files changed, 635 insertions(+), 195 deletions(-)
> >   create mode 100644 tools/testing/selftests/kvm/dirty_log_perf_test.c
> >   create mode 100644 tools/testing/selftests/kvm/include/perf_test_util.h
> > 
> 
> Queued, thanks.

Why would you do that? Peter reviewed this, making several comments,
such as not to put non-inline functions in header files. Ben took the
time to respin the series, posting a v2. It makes no sense to pick up
v1 after they put in that additional effort.

drew