[PATCH v3] KVM: selftests: Fix nsec to sec conversion in demand_paging_test.

[PATCH v3] KVM: selftests: Fix nsec to sec conversion in demand_paging_test.

[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>
---

v3:
- Add version number to patch
- Correct "KVM: selftests" tag in shortlog

v2: https://lore.kernel.org/all/20230216200218.1028943-1-amoorthy@google.com/
- Change to Oliver's log message

v1: https://lore.kernel.org/all/20230216200218.1028943-1-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

Re: [PATCH v3] KVM: selftests: Fix nsec to sec conversion in demand_paging_test.

[Sean Christopherson]

On Thu, 23 Feb 2023 00:18:05 +0000, 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.
> 
> 

Applied to kvm-x86 selftests, thanks!

[1/1] KVM: selftests: Fix nsec to sec conversion in demand_paging_test.
      https://github.com/kvm-x86/linux/commit/f6baabdcadd1

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes