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authorWei Huang <wei@redhat.com>2015-01-21 16:15:31 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2015-01-26 12:27:05 +0100
commit874b1cfad51e325d535f99261f91c92df444c18c (patch)
treeb8f1088e836d817c83889fa3cd10ef8316f9d850 /qemu-options.hx
parent2c9d535a2e43699de32987b76cf548a39e4d04d2 (diff)
kvm_stat: Print errno when syscall to perf_event_open() fails
kvm_stat uses syscall() to call perf_event_open(). If this function call fails, the returned value is -1, which doesn't tell the details of such failure (i.e. ENOSYS or EINVAL). This patch retrieves errno and prints it when syscall() fails. The error message will look like "Exception: perf_event_open failed, errno = 38". Signed-off-by: Wei Huang <wei@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'qemu-options.hx')
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