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590029f672
The previous OOM testing support would re-run the entire "main"
method each iteration, failing a different malloc each time.
When a test suite has 'n' allocations, the number of repeats
requires is (n * (n + 1) ) / 2. This gets very large, very
quickly.
This new OOM testing support instead integrates at the
virtTestRun level, so each individual test case gets repeated,
instead of the entire test suite. This means the values of
'n' are orders of magnitude smaller.
The simple usage is
$ VIR_TEST_OOM=1 ./qemuxml2argvtest
...
29) QEMU XML-2-ARGV clock-utc ... OK
Test OOM for nalloc=36 .................................... OK
30) QEMU XML-2-ARGV clock-localtime ... OK
Test OOM for nalloc=36 .................................... OK
31) QEMU XML-2-ARGV clock-france ... OK
Test OOM for nalloc=38 ...................................... OK
...
the second lines reports how many mallocs have to be failed, and thus
how many repeats of the test will be run.
If it crashes, then running under valgrind will often show the problem
$ VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest
When debugging problems it is also helpful to select an individual
test case
$ VIR_TEST_RANGE=30 VIR_TEST_OOM=1 ../run valgrind ./qemuxml2argvtest
When things get really tricky, it is possible to request that just
specific allocs are failed. eg to fail allocs 5 -> 12, use
$ VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-12 ../run valgrind ./qemuxml2argvtest
In the worse case, you might want to know the stack trace of the
alloc which was failed then VIR_TEST_OOM_TRACE can be set. If it
is set to 1 then it will only print if it thinks a mistake happened.
This is often not reliable, so setting it to 2 will make it print
the stack trace for every alloc that is failed.
$ VIR_TEST_OOM_TRACE=2 VIR_TEST_RANGE=30 VIR_TEST_OOM=1:5-5 ../run valgrind ./qemuxml2argvtest
30) QEMU XML-2-ARGV clock-localtime ... OK
Test OOM for nalloc=36 !virAllocN
/home/berrange/src/virt/libvirt/src/util/viralloc.c:180
virHashCreateFull
/home/berrange/src/virt/libvirt/src/util/virhash.c:144
virDomainDefParseXML
/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:11745
virDomainDefParseNode
/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12646
virDomainDefParse
/home/berrange/src/virt/libvirt/src/conf/domain_conf.c:12590
testCompareXMLToArgvFiles
/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:106
virtTestRun
/home/berrange/src/virt/libvirt/tests/testutils.c:250
mymain
/home/berrange/src/virt/libvirt/tests/qemuxml2argvtest.c:418 (discriminator 2)
virtTestMain
/home/berrange/src/virt/libvirt/tests/testutils.c:750
??
??:0
_start
??:?
FAILED
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
108 lines
4.0 KiB
C
108 lines
4.0 KiB
C
/*
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* utils.c: test utils
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*
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* Copyright (C) 2005, 2008-2013 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Karel Zak <kzak@redhat.com>
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*/
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#ifndef __VIT_TEST_UTILS_H__
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# define __VIT_TEST_UTILS_H__
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# include <stdio.h>
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# include "viralloc.h"
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# include "virfile.h"
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# include "virstring.h"
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# define EXIT_AM_SKIP 77 /* tell Automake we're skipping a test */
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# define EXIT_AM_HARDFAIL 99 /* tell Automake that the framework is broken */
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/* Work around lack of gnulib support for fprintf %z */
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# ifndef NO_LIBVIRT
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# undef fprintf
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# define fprintf virFilePrintf
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# endif
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extern char *progname;
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/* Makefile.am provides these two definitions */
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# if !defined(abs_srcdir) || !defined(abs_builddir)
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# error Fix Makefile.am
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# endif
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bool virtTestOOMActive(void);
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void virtTestResult(const char *name, int ret, const char *msg, ...)
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ATTRIBUTE_FMT_PRINTF(3,4);
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int virtTestRun(const char *title,
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int (*body)(const void *data),
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const void *data);
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int virtTestLoadFile(const char *file, char **buf);
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int virtTestCaptureProgramOutput(const char *const argv[], char **buf, int maxlen);
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int virtTestClearLineRegex(const char *pattern,
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char *string);
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int virtTestDifference(FILE *stream,
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const char *expect,
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const char *actual);
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int virtTestDifferenceBin(FILE *stream,
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const char *expect,
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const char *actual,
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size_t length);
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unsigned int virTestGetDebug(void);
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unsigned int virTestGetVerbose(void);
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unsigned int virTestGetExpensive(void);
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char *virtTestLogContentAndReset(void);
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void virtTestQuiesceLibvirtErrors(bool always);
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int virtTestMain(int argc,
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char **argv,
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int (*func)(void));
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/* Setup, then call func() */
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# define VIRT_TEST_MAIN(func) \
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int main(int argc, char **argv) { \
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return virtTestMain(argc, argv, func); \
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}
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# define VIRT_TEST_MAIN_PRELOAD(func, lib) \
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int main(int argc, char **argv) { \
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const char *preload = getenv("LD_PRELOAD"); \
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if (preload == NULL || strstr(preload, lib) == NULL) { \
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char *newenv; \
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if (!virFileIsExecutable(lib)) { \
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perror(lib); \
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return EXIT_FAILURE; \
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} \
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if (!preload) { \
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newenv = (char *) lib; \
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} else if (virAsprintf(&newenv, "%s:%s", lib, preload) < 0) { \
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perror("virAsprintf"); \
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return EXIT_FAILURE; \
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} \
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setenv("LD_PRELOAD", newenv, 1); \
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execv(argv[0], argv); \
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} \
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return virtTestMain(argc, argv, func); \
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}
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#endif /* __VIT_TEST_UTILS_H__ */
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