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* [PATCH] selftests/kvm: Fix bug in how demand_paging_test calculates paging rate
@ 2023-02-16 20:02 Anish Moorthy
  2023-02-16 20:13 ` Oliver Upton
  0 siblings, 1 reply; 5+ messages in thread
From: Anish Moorthy @ 2023-02-16 20:02 UTC (permalink / raw)
  To: pbonzini, kvm; +Cc: jthoughton, seanjc, oliver.upton, Anish Moorthy

The current denominator is 1E8, not 1E9 as it should be.

Reported-by: James Houghton <jthoughton@google.com>
Signed-off-by: Anish Moorthy <amoorthy@google.com>
---
 tools/testing/selftests/kvm/demand_paging_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index b0e1fc4de9e29..2439c4043fed6 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -194,7 +194,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 		ts_diff.tv_sec, ts_diff.tv_nsec);
 	pr_info("Overall demand paging rate: %f pgs/sec\n",
 		memstress_args.vcpu_args[0].pages * nr_vcpus /
-		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0));
+		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / NSEC_PER_SEC));
 
 	memstress_destroy_vm(vm);
 
-- 
2.39.2.637.g21b0678d19-goog


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* Re: [PATCH] selftests/kvm: Fix bug in how demand_paging_test calculates paging rate
  2023-02-16 20:02 [PATCH] selftests/kvm: Fix bug in how demand_paging_test calculates paging rate Anish Moorthy
@ 2023-02-16 20:13 ` Oliver Upton
  2023-02-16 20:17   ` Sean Christopherson
  0 siblings, 1 reply; 5+ messages in thread
From: Oliver Upton @ 2023-02-16 20:13 UTC (permalink / raw)
  To: Anish Moorthy; +Cc: pbonzini, kvm, jthoughton, seanjc

The shortlog doesn't give any hint as to what the bug actually is.
Maybe:

  KVM: selftests: Fix nsec to sec conversion in demand_paging_test

On Thu, Feb 16, 2023 at 08:02:18PM +0000, Anish Moorthy wrote:
> The current denominator is 1E8, not 1E9 as it should be.

  demand_paging_test uses 1E8 as the denominator to convert nanoseconds
  to seconds, which is wrong. Use NSEC_PER_SEC instead to fix the issue
  and make the conversion obvious.

> Reported-by: James Houghton <jthoughton@google.com>
> Signed-off-by: Anish Moorthy <amoorthy@google.com>

Bikeshedding aside:

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

> ---
>  tools/testing/selftests/kvm/demand_paging_test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
> index b0e1fc4de9e29..2439c4043fed6 100644
> --- a/tools/testing/selftests/kvm/demand_paging_test.c
> +++ b/tools/testing/selftests/kvm/demand_paging_test.c
> @@ -194,7 +194,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
>  		ts_diff.tv_sec, ts_diff.tv_nsec);
>  	pr_info("Overall demand paging rate: %f pgs/sec\n",
>  		memstress_args.vcpu_args[0].pages * nr_vcpus /
> -		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0));
> +		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / NSEC_PER_SEC));
>  
>  	memstress_destroy_vm(vm);
>  
> -- 
> 2.39.2.637.g21b0678d19-goog
> 

-- 
Thanks,
Oliver

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] selftests/kvm: Fix bug in how demand_paging_test calculates paging rate
  2023-02-16 20:13 ` Oliver Upton
@ 2023-02-16 20:17   ` Sean Christopherson
  2023-02-16 20:24     ` [PATCH] selftests/kvm: Fix nsec to sec conversion in demand_paging_test Anish Moorthy
  0 siblings, 1 reply; 5+ messages in thread
From: Sean Christopherson @ 2023-02-16 20:17 UTC (permalink / raw)
  To: Oliver Upton; +Cc: Anish Moorthy, pbonzini, kvm, jthoughton

On Thu, Feb 16, 2023, Oliver Upton wrote:
> The shortlog doesn't give any hint as to what the bug actually is.
> Maybe:
> 
>   KVM: selftests: Fix nsec to sec conversion in demand_paging_test

+1

> On Thu, Feb 16, 2023 at 08:02:18PM +0000, Anish Moorthy wrote:
> > The current denominator is 1E8, not 1E9 as it should be.
> 
>   demand_paging_test uses 1E8 as the denominator to convert nanoseconds
>   to seconds, which is wrong. Use NSEC_PER_SEC instead to fix the issue
>   and make the conversion obvious.
> 
> > Reported-by: James Houghton <jthoughton@google.com>
> > Signed-off-by: Anish Moorthy <amoorthy@google.com>
> 
> Bikeshedding aside:
> 
> Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

With Oliver's shortlog (I'm indifferent on the changelog),

Reviewed-by: Sean Christopherson <seanjc@google.com>

^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH] selftests/kvm: Fix nsec to sec conversion in demand_paging_test.
  2023-02-16 20:17   ` Sean Christopherson
@ 2023-02-16 20:24     ` Anish Moorthy
  2023-02-16 20:33       ` Sean Christopherson
  0 siblings, 1 reply; 5+ messages in thread
From: Anish Moorthy @ 2023-02-16 20:24 UTC (permalink / raw)
  To: pbonzini, kvm; +Cc: jthoughton, seanjc, oliver.upton, Anish Moorthy

demand_paging_test uses 1E8 as the denominator to convert nanoseconds to
seconds, which is wrong. Use NSEC_PER_SEC instead to fix the issue and
make the conversion obvious.

Reported-by: James Houghton <jthoughton@google.com>
Signed-off-by: Anish Moorthy <amoorthy@google.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Reviewed-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/demand_paging_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index b0e1fc4de9e29..2439c4043fed6 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -194,7 +194,7 @@ static void run_test(enum vm_guest_mode mode, void *arg)
 		ts_diff.tv_sec, ts_diff.tv_nsec);
 	pr_info("Overall demand paging rate: %f pgs/sec\n",
 		memstress_args.vcpu_args[0].pages * nr_vcpus /
-		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0));
+		((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / NSEC_PER_SEC));
 
 	memstress_destroy_vm(vm);
 
-- 
2.39.2.637.g21b0678d19-goog


^ permalink raw reply related	[flat|nested] 5+ messages in thread

* Re: [PATCH] selftests/kvm: Fix nsec to sec conversion in demand_paging_test.
  2023-02-16 20:24     ` [PATCH] selftests/kvm: Fix nsec to sec conversion in demand_paging_test Anish Moorthy
@ 2023-02-16 20:33       ` Sean Christopherson
  0 siblings, 0 replies; 5+ messages in thread
From: Sean Christopherson @ 2023-02-16 20:33 UTC (permalink / raw)
  To: Anish Moorthy; +Cc: pbonzini, kvm, jthoughton, oliver.upton

"KVM: selftests:" please.

And when sending a new version, bump the version number, i.e. the subject should
read "[PATCH v2] ..."

On Thu, Feb 16, 2023, Anish Moorthy wrote:
> demand_paging_test uses 1E8 as the denominator to convert nanoseconds to
> seconds, which is wrong. Use NSEC_PER_SEC instead to fix the issue and
> make the conversion obvious.
> 
> Reported-by: James Houghton <jthoughton@google.com>
> Signed-off-by: Anish Moorthy <amoorthy@google.com>
> Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
> Reviewed-by: Sean Christopherson <seanjc@google.com>
> ---

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2023-02-16 20:34 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-02-16 20:02 [PATCH] selftests/kvm: Fix bug in how demand_paging_test calculates paging rate Anish Moorthy
2023-02-16 20:13 ` Oliver Upton
2023-02-16 20:17   ` Sean Christopherson
2023-02-16 20:24     ` [PATCH] selftests/kvm: Fix nsec to sec conversion in demand_paging_test Anish Moorthy
2023-02-16 20:33       ` Sean Christopherson

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