From: Peter Xu <peterx@redhat.com>
To: Ben Gardon <bgardon@google.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Andrew Jones <drjones@redhat.com>,
Peter Shier <pshier@google.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Thomas Huth <thuth@redhat.com>, Peter Feiner <pfeiner@google.com>
Subject: Re: [PATCH 2/5] KVM: selftests: Remove address rounding in guest code
Date: Mon, 2 Nov 2020 16:25:01 -0500 [thread overview]
Message-ID: <20201102212501.GC20600@xz-x1> (raw)
In-Reply-To: <20201027233733.1484855-3-bgardon@google.com>
On Tue, Oct 27, 2020 at 04:37:30PM -0700, Ben Gardon wrote:
> Rounding the address the guest writes to a host page boundary
> will only have an effect if the host page size is larger than the guest
> page size, but in that case the guest write would still go to the same
> host page. There's no reason to round the address down, so remove the
> rounding to simplify the demand paging test.
>
> This series was tested by running the following invocations on an Intel
> Skylake machine:
> dirty_log_perf_test -b 20m -i 100 -v 64
> dirty_log_perf_test -b 20g -i 5 -v 4
> dirty_log_perf_test -b 4g -i 5 -v 32
> demand_paging_test -b 20m -v 64
> demand_paging_test -b 20g -v 4
> demand_paging_test -b 4g -v 32
> All behaved as expected.
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
Nit: would be better to be before the code movement. In all cases:
Reviewed-by: Peter Xu <peterx@redhat.com>
--
Peter Xu
next prev parent reply other threads:[~2020-11-02 21:25 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 23:37 [PATCH 0/5] Add a dirty logging performance test Ben Gardon
2020-10-27 23:37 ` [PATCH 1/5] KVM: selftests: Factor code out of demand_paging_test Ben Gardon
2020-11-02 21:23 ` Peter Xu
2020-11-02 22:57 ` Ben Gardon
2020-10-27 23:37 ` [PATCH 2/5] KVM: selftests: Remove address rounding in guest code Ben Gardon
2020-11-02 21:25 ` Peter Xu [this message]
2020-10-27 23:37 ` [PATCH 3/5] KVM: selftests: Simplify demand_paging_test with timespec_diff_now Ben Gardon
2020-11-02 21:27 ` Peter Xu
2020-11-02 22:59 ` Ben Gardon
2020-10-27 23:37 ` [PATCH 4/5] KVM: selftests: Add wrfract to common guest code Ben Gardon
2020-10-27 23:37 ` [PATCH 5/5] KVM: selftests: Introduce the dirty log perf test Ben Gardon
2020-11-02 22:21 ` Peter Xu
2020-11-02 23:56 ` Ben Gardon
2020-11-03 1:12 ` Peter Xu
2020-11-03 22:17 ` Ben Gardon
2020-11-03 22:27 ` Peter Xu
2020-11-06 12:48 ` [PATCH 0/5] Add a dirty logging performance test Paolo Bonzini
2020-11-09 9:21 ` Andrew Jones
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