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KVM: selftests: Allow dumping per-vcpu info for uffd threads

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There's one PER_VCPU_DEBUG in per-vcpu uffd threads but it's never hit.

Trigger that when quit in normal ways (kick pollfd[1]), meanwhile fix the
number of nanosec calculation.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: James Houghton <jthoughton@google.com>
Link: https://lore.kernel.org/r/20230427201112.2164776-3-peterx@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Peter Xu 2023-04-27 16:11:12 -04:00 committed by Sean Christopherson
parent ba125de35d
commit 21912a653d
1 changed files with 2 additions and 2 deletions
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4
tools/testing/selftests/kvm/lib/userfaultfd_util.c
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@ -70,7 +70,7 @@ static void *uffd_handler_thread_fn(void *arg)
r = read(pollfd[1].fd, &tmp_chr, 1);
TEST_ASSERT(r == 1,
"Error reading pipefd in UFFD thread\n");
return NULL;
break;
}
if (!(pollfd[0].revents & POLLIN))
@ -103,7 +103,7 @@ static void *uffd_handler_thread_fn(void *arg)
ts_diff = timespec_elapsed(start);
PER_VCPU_DEBUG("userfaulted %ld pages over %ld.%.9lds. (%f/sec)\n",
pages, ts_diff.tv_sec, ts_diff.tv_nsec,
pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / 100000000.0));
pages / ((double)ts_diff.tv_sec + (double)ts_diff.tv_nsec / NSEC_PER_SEC));
return NULL;
}