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| author | Wei Huang | 2015-01-21 22:15:31 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2015-01-26 12:27:05 +0100 |
| commit | 874b1cfad51e325d535f99261f91c92df444c18c (patch) | |
| tree | b8f1088e836d817c83889fa3cd10ef8316f9d850 /linux-headers | |
| parent | kvm_stat: Update exit reasons to the latest defintion (diff) | |
| download | qemu-874b1cfad51e325d535f99261f91c92df444c18c.tar.gz qemu-874b1cfad51e325d535f99261f91c92df444c18c.tar.xz qemu-874b1cfad51e325d535f99261f91c92df444c18c.zip | |
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 'linux-headers')
0 files changed, 0 insertions, 0 deletions