Revision 6915fe26
b/Makefile.am | ||
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724 | 724 |
test/ganeti.tools.ensure_dirs_unittest.py \ |
725 | 725 |
test/ganeti.uidpool_unittest.py \ |
726 | 726 |
test/ganeti.utils.algo_unittest.py \ |
727 |
test/ganeti.utils.cfunc_unittest.py \ |
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727 |
test/ganeti.utils.cfunc.mlockall_unittest.py \
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728 | 728 |
test/ganeti.utils.filelock_unittest.py \ |
729 | 729 |
test/ganeti.utils.hash_unittest.py \ |
730 | 730 |
test/ganeti.utils.io_unittest.py \ |
b/lib/utils/cfunc.py | ||
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34 | 34 |
ctypes = None |
35 | 35 |
|
36 | 36 |
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# Flags for mlockall() (from bits/mman.h) |
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# Flags for mlockall(2) (from bits/mman.h)
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38 | 38 |
_MCL_CURRENT = 1 |
39 | 39 |
_MCL_FUTURE = 2 |
40 | 40 |
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41 | 41 |
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class _FuncWrapper: |
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def __init__(self, ct): |
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"""Initializes this class. |
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|
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""" |
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# Make use of a dlopen(3) feature whereby giving a NULL handle returns the |
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# main program. Functions from all previously loaded libraries can then be |
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# used. |
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mainprog = ct.CDLL(None) |
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# The ctypes module before Python 2.6 does not have built-in functionality |
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# to access the global errno global (which, depending on the libc and build |
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# options, is per-thread), where function error codes are stored. Use GNU |
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# libc's way to retrieve errno(3) instead. |
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try: |
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errno_loc = getattr(mainprog, "__errno_location") |
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except AttributeError, err: |
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logging.debug("Unable to find errno location: %s", err) |
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errno_fn = None |
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else: |
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errno_loc.restype = ct.POINTER(ct.c_int) |
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errno_fn = lambda: errno_loc().contents.value |
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self.errno_fn = errno_fn |
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# Try to get mlockall(2) |
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self.mlockall_fn = getattr(mainprog, "mlockall", None) |
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70 |
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42 | 71 |
def Mlockall(_ctypes=ctypes): |
43 | 72 |
"""Lock current process' virtual address space into RAM. |
44 | 73 |
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This is equivalent to the C call mlockall(MCL_CURRENT|MCL_FUTURE),
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see mlock(2) for more details. This function requires ctypes module.
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This is equivalent to the C call C{mlockall(MCL_CURRENT | MCL_FUTURE)}. See
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mlockall(2) for more details. This function requires the C{ctypes} module.
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47 | 76 |
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@raises errors.NoCtypesError: if ctypes module is not found
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@raises errors.NoCtypesError: If the C{ctypes} module is not found
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49 | 78 |
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50 | 79 |
""" |
51 | 80 |
if _ctypes is None: |
52 | 81 |
raise errors.NoCtypesError() |
53 | 82 |
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try: |
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libc = _ctypes.cdll.LoadLibrary("libc.so.6") |
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except EnvironmentError, err: |
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logging.error("Failure trying to load libc: %s", err) |
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libc = None |
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if libc is None: |
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logging.error("Cannot set memory lock, ctypes cannot load libc") |
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return |
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|
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# Some older version of the ctypes module don't have built-in functionality |
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# to access the errno global variable, where function error codes are stored. |
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# By declaring this variable as a pointer to an integer we can then access |
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# its value correctly, should the mlockall call fail, in order to see what |
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# the actual error code was. |
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# pylint: disable=W0212 |
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libc.__errno_location.restype = _ctypes.POINTER(_ctypes.c_int) |
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if libc.mlockall(_MCL_CURRENT | _MCL_FUTURE): |
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# pylint: disable=W0212 |
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logging.error("Cannot set memory lock: %s", |
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os.strerror(libc.__errno_location().contents.value)) |
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return |
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76 |
|
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logging.debug("Memory lock set") |
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funcs = _FuncWrapper(_ctypes) |
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84 |
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if funcs.mlockall_fn is None: |
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logging.debug("libc doesn't support mlockall(2)") |
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else: |
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if funcs.mlockall_fn(_MCL_CURRENT | _MCL_FUTURE) == 0: |
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logging.debug("Memory lock set") |
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return True |
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91 |
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logging.error("Cannot set memory lock: %s", os.strerror(funcs.errno_fn())) |
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93 |
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return False |
b/test/ganeti.utils.cfunc.mlockall_unittest.py | ||
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1 |
#!/usr/bin/python |
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# |
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# Copyright (C) 2010, 2011 Google Inc. |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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9 |
# (at your option) any later version. |
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10 |
# |
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# This program is distributed in the hope that it will be useful, but |
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12 |
# WITHOUT ANY WARRANTY; without even the implied warranty of |
|
13 |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
14 |
# General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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18 |
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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# 02110-1301, USA. |
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20 |
|
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|
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"""Script for testing utils.Mlockall |
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23 |
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This test is run in a separate process because it changes memory behaviour. |
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""" |
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import unittest |
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from ganeti import utils |
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from ganeti import errors |
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import testutils |
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34 |
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35 |
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# WARNING: The following tests modify the memory behaviour at runtime. Don't |
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# add unrelated tests here. |
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38 |
|
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39 |
|
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class TestMlockallWithCtypes(unittest.TestCase): |
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"""Whether Mlockall() works if ctypes is present. |
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42 |
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""" |
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def test(self): |
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if utils.ctypes: |
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self.assertTrue(utils.Mlockall()) |
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47 |
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48 |
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class TestMlockallWithNoCtypes(unittest.TestCase): |
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"""Whether Mlockall() raises an error if ctypes is not present. |
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51 |
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""" |
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def test(self): |
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self.assertRaises(errors.NoCtypesError, utils.Mlockall, _ctypes=None) |
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56 |
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if __name__ == "__main__": |
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testutils.GanetiTestProgram() |
/dev/null | ||
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1 |
#!/usr/bin/python |
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2 |
# |
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3 |
|
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4 |
# Copyright (C) 2010, 2011 Google Inc. |
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5 |
# |
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# This program is free software; you can redistribute it and/or modify |
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7 |
# it under the terms of the GNU General Public License as published by |
|
8 |
# the Free Software Foundation; either version 2 of the License, or |
|
9 |
# (at your option) any later version. |
|
10 |
# |
|
11 |
# This program is distributed in the hope that it will be useful, but |
|
12 |
# WITHOUT ANY WARRANTY; without even the implied warranty of |
|
13 |
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
14 |
# General Public License for more details. |
|
15 |
# |
|
16 |
# You should have received a copy of the GNU General Public License |
|
17 |
# along with this program; if not, write to the Free Software |
|
18 |
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
|
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# 02110-1301, USA. |
|
20 |
|
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21 |
|
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22 |
"""Script for testing utils.Mlockall |
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23 |
|
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24 |
This test is run in a separate process because it changes memory behaviour. |
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25 |
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""" |
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import unittest |
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29 |
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from ganeti import utils |
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from ganeti import errors |
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import testutils |
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34 |
|
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35 |
|
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36 |
# WARNING: The following tests modify the memory behaviour at runtime. Don't |
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37 |
# add unrelated tests here. |
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38 |
|
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39 |
|
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40 |
class TestMlockallWithCtypes(unittest.TestCase): |
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"""Whether Mlockall() works if ctypes is present. |
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42 |
|
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""" |
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44 |
|
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def test(self): |
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if utils.ctypes: |
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utils.Mlockall() |
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48 |
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49 |
|
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50 |
class TestMlockallWithNoCtypes(unittest.TestCase): |
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"""Whether Mlockall() raises an error if ctypes is not present. |
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|
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""" |
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|
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def test(self): |
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self.assertRaises(errors.NoCtypesError, utils.Mlockall, _ctypes=None) |
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58 |
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if __name__ == "__main__": |
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testutils.GanetiTestProgram() |
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