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From: Andrew Jones <drjones@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>,
	Cannon Matthews <cannonmatthews@google.com>,
	Peter Xu <peterx@redhat.com>, Peter Shier <pshier@google.com>,
	Oliver Upton <oupton@google.com>
Subject: Re: [PATCH v4 08/10] KVM: selftests: Time guest demand paging
Date: Fri, 24 Jan 2020 11:21:03 +0100
Message-ID: <20200124102103.uezov62hlpzwmtny@kamzik.brq.redhat.com> (raw)
In-Reply-To: <20200123180436.99487-9-bgardon@google.com>

On Thu, Jan 23, 2020 at 10:04:34AM -0800, Ben Gardon wrote:
> In order to quantify demand paging performance, time guest execution
> during demand paging.
> 
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
>  .../selftests/kvm/demand_paging_test.c        | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
> index 2002032df32cc..0dc5d04718678 100644
> --- a/tools/testing/selftests/kvm/demand_paging_test.c
> +++ b/tools/testing/selftests/kvm/demand_paging_test.c
> @@ -32,6 +32,12 @@
>  
>  #define DEFAULT_GUEST_TEST_MEM_SIZE (1 << 30) /* 1G */
>  
> +#ifdef PRINT_PER_PAGE_UPDATES
> +#define PER_PAGE_DEBUG(...) DEBUG(__VA_ARGS__)
> +#else
> +#define PER_PAGE_DEBUG(...)
> +#endif
> +
>  #ifdef PRINT_PER_VCPU_UPDATES
>  #define PER_VCPU_DEBUG(...) DEBUG(__VA_ARGS__)
>  #else
> @@ -64,6 +70,26 @@ static uint64_t guest_test_phys_mem;
>   */
>  static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
>  
> +int64_t to_ns(struct timespec ts)
> +{
> +	return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
> +}
> +
> +struct timespec diff(struct timespec start, struct  timespec end)
> +{
> +	struct   timespec temp;
> +
> +	if ((end.tv_nsec-start.tv_nsec) < 0) {

spaces around the '-' would be nice

> +		temp.tv_sec = end.tv_sec - start.tv_sec - 1;
> +		temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
> +	} else {
> +		temp.tv_sec = end.tv_sec - start.tv_sec;
> +		temp.tv_nsec = end.tv_nsec - start.tv_nsec;
> +	}
> +
> +	return temp;
> +}

Could probably add these new time utilities to the new test_util.c

Thanks,
drew


  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 18:04 [PATCH v4 00/10] Create a userfaultfd demand paging test Ben Gardon
2020-01-23 18:04 ` [PATCH v4 01/10] KVM: selftests: Create a " Ben Gardon
2020-01-24  9:49   ` Andrew Jones
2020-01-27  9:18   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 02/10] KVM: selftests: Add demand paging content to the " Ben Gardon
2020-01-23 18:04 ` [PATCH v4 03/10] KVM: selftests: Add configurable demand paging delay Ben Gardon
2020-01-23 18:04 ` [PATCH v4 04/10] KVM: selftests: Add memory size parameter to the demand paging test Ben Gardon
2020-01-24 10:01   ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 05/10] KVM: selftests: Pass args to vCPU in global vCPU args struct Ben Gardon
2020-01-23 18:04 ` [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to aarch64 and s390x Ben Gardon
2020-01-24  9:03   ` Paolo Bonzini
2020-01-24  9:35     ` Andrew Jones
2020-01-24  9:44       ` Paolo Bonzini
2020-01-24 10:45       ` Andrew Jones
2020-01-24 18:33     ` Christian Borntraeger
2020-01-25  9:34   ` Paolo Bonzini
2020-01-27  8:38     ` Andrew Jones
2020-01-27  9:01   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 07/10] KVM: selftests: Support multiple vCPUs in demand paging test Ben Gardon
2020-01-24 10:16   ` Andrew Jones
2020-01-24 10:49   ` Andrew Jones
2020-01-25  9:39     ` Paolo Bonzini
2020-01-27  8:39       ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 08/10] KVM: selftests: Time guest demand paging Ben Gardon
2020-01-24 10:21   ` Andrew Jones [this message]
2020-01-23 18:04 ` [PATCH v4 09/10] KVM: selftests: Stop memslot creation in KVM internal memslot region Ben Gardon
2020-01-24  8:58   ` Paolo Bonzini
2020-01-24 18:41     ` Ben Gardon
2020-01-25  9:37       ` Paolo Bonzini
2020-01-27 17:28         ` Ben Gardon
2020-01-23 18:04 ` [PATCH v4 10/10] KVM: selftests: Move memslot 0 above KVM internal memslots Ben Gardon
2020-01-24  9:01   ` Paolo Bonzini
2020-01-24 18:53     ` Ben Gardon
2020-01-27  9:42   ` Thomas Huth
2020-01-24  9:03 ` [PATCH v4 00/10] Create a userfaultfd demand paging test Paolo Bonzini

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