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-rwxr-xr-xscripts/kvm/kvm_stat7
1 files changed, 6 insertions, 1 deletions
diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat
index 95c650b1c3..8f6f00715e 100755
--- a/scripts/kvm/kvm_stat
+++ b/scripts/kvm/kvm_stat
@@ -13,6 +13,7 @@
import curses
import sys, os, time, optparse, ctypes
+from ctypes import *
class DebugfsProvider(object):
def __init__(self):
@@ -247,6 +248,9 @@ import struct, array
libc = ctypes.CDLL('libc.so.6')
syscall = libc.syscall
+get_errno = libc.__errno_location
+get_errno.restype = POINTER(c_int)
+
class perf_event_attr(ctypes.Structure):
_fields_ = [('type', ctypes.c_uint32),
('size', ctypes.c_uint32),
@@ -330,7 +334,8 @@ class Event(object):
group_leader = group.events[0].fd
fd = _perf_event_open(attr, -1, group.cpu, group_leader, 0)
if fd == -1:
- raise Exception('perf_event_open failed')
+ err = get_errno()[0]
+ raise Exception('perf_event_open failed, errno = ' + err.__str__())
if filter:
import fcntl
fcntl.ioctl(fd, ioctl_numbers['SET_FILTER'], filter)