Remove existing OOM test impl

The current OOM test impl is too inefficient to be used on the
large test suites. It loops running 'main' multiple times, once
for each alloc in the 'main' method. This has complexity
'n * (n + 1) / 2' in terms of total alloc count. It will be
replaced by a more efficient impl whicih runs individual test
cases instead. This will have same complexity but the values
of 'n' will be much smaller, so a net win.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

tests/testutils.c

@@ -47,10 +47,6 @@
 #include "virprocess.h"
 #include "virstring.h"
 
-#if TEST_OOM_TRACE
-# include <execinfo.h>
-#endif
-
 #ifdef HAVE_PATHS_H
 # include <paths.h>
 #endif
@@ -68,7 +64,6 @@ static unsigned int testDebug = -1;
 static unsigned int testVerbose = -1;
 static unsigned int testExpensive = -1;
 
-static unsigned int testOOM = 0;
 static size_t testCounter = 0;
 static size_t testStart = 0;
 static size_t testEnd = 0;
@@ -151,10 +146,8 @@ virtTestRun(const char *title, int nloops, int (*body)(const void *data), const
          testCounter > testEnd))
         return 0;
 
-    if (testOOM < 2) {
     if (virTestGetVerbose())
         fprintf(stderr, "%2zu) %-65s ... ", testCounter, title);
-    }
 
     if (nloops > 1 && (VIR_ALLOC_N(ts, nloops) < 0))
         return -1;
@@ -182,7 +175,6 @@ virtTestRun(const char *title, int nloops, int (*body)(const void *data), const
             ts[i] = DIFF_MSEC(&after, &before);
         }
     }
-    if (testOOM < 2) {
     if (virTestGetVerbose()) {
         if (ret == 0 && ts)
             fprintf(stderr, "OK     [%.5f ms]\n",
@@ -206,7 +198,6 @@ virtTestRun(const char *title, int nloops, int (*body)(const void *data), const
         else
             fprintf(stderr, "!");
     }
-    }
 
     VIR_FREE(ts);
     return ret;
@@ -539,27 +530,6 @@ virtTestLogContentAndReset(void)
     return ret;
 }
 
-#if TEST_OOM_TRACE
-static void
-virtTestErrorHook(int n, void *data ATTRIBUTE_UNUSED)
-{
-    void *trace[30];
-    int ntrace = ARRAY_CARDINALITY(trace);
-    size_t i;
-    char **symbols = NULL;
-
-    ntrace = backtrace(trace, ntrace);
-    symbols = backtrace_symbols(trace, ntrace);
-    if (symbols) {
-        fprintf(stderr, "Failing allocation %d at:\n", n);
-        for (i = 0; i < ntrace; i++) {
-            if (symbols[i])
-                fprintf(stderr, "  TRACE:  %s\n", symbols[i]);
-        }
-        VIR_FREE(symbols);
-    }
-}
-#endif
 
 static unsigned int
 virTestGetFlag(const char *name) {
@@ -603,15 +573,6 @@ int virtTestMain(int argc,
     int ret;
     bool abs_srcdir_cleanup = false;
     char *testRange = NULL;
-#if TEST_OOM
-    int approxAlloc = 0;
-    int n;
-    char *oomStr = NULL;
-    int oomCount;
-    int mp = 0;
-    pid_t *workers;
-    int worker = 0;
-#endif
 
     abs_srcdir = getenv("abs_srcdir");
     if (!abs_srcdir) {
@@ -672,112 +633,7 @@ int virtTestMain(int argc,
         }
     }
 
-#if TEST_OOM
-    if ((oomStr = getenv("VIR_TEST_OOM")) != NULL) {
-        if (virStrToLong_i(oomStr, NULL, 10, &oomCount) < 0)
-            oomCount = 0;
-
-        if (oomCount < 0)
-            oomCount = 0;
-        if (oomCount)
-            testOOM = 1;
-    }
-
-    if (getenv("VIR_TEST_MP") != NULL) {
-        mp = sysconf(_SC_NPROCESSORS_ONLN);
-        fprintf(stderr, "Using %d worker processes\n", mp);
-        if (VIR_ALLOC_N(workers, mp) < 0) {
-            ret = EXIT_FAILURE;
-            goto cleanup;
-        }
-    }
-
-    /* Run once to prime any static allocations & ensure it passes */
-    ret = (func)();
-    if (ret != EXIT_SUCCESS)
-        goto cleanup;
-
-# if TEST_OOM_TRACE
-    if (virTestGetDebug())
-        virAllocTestHook(virtTestErrorHook, NULL);
-# endif
-
-    if (testOOM) {
-        /* Makes next test runs quiet... */
-        testOOM++;
-        virtTestQuiesceLibvirtErrors(true);
-
-        virAllocTestInit();
-
-        /* Run again to count allocs, and ensure it passes :-) */
     ret = (func)();
-        if (ret != EXIT_SUCCESS)
-            goto cleanup;
-
-        approxAlloc = virAllocTestCount();
-        testCounter++;
-        if (virTestGetDebug())
-            fprintf(stderr, "%zu) OOM...\n", testCounter);
-        else
-            fprintf(stderr, "%zu) OOM of %d allocs ", testCounter, approxAlloc);
-
-        if (mp) {
-            size_t i;
-            for (i = 0; i < mp; i++) {
-                workers[i] = fork();
-                if (workers[i] == 0) {
-                    worker = i + 1;
-                    break;
-                }
-            }
-        }
-
-        /* Run once for each alloc, failing a different one
-           and validating that the test case failed */
-        for (n = 0; n < approxAlloc && (!mp || worker); n++) {
-            if (mp &&
-                (n % mp) != (worker - 1))
-                continue;
-            if (!virTestGetDebug()) {
-                if (mp)
-                    fprintf(stderr, "%d", worker);
-                else
-                    fprintf(stderr, ".");
-                fflush(stderr);
-            }
-            virAllocTestOOM(n+1, oomCount);
-
-            if (((func)()) != EXIT_FAILURE) {
-                ret = EXIT_FAILURE;
-                break;
-            }
-        }
-
-        if (mp) {
-            if (worker) {
-                _exit(ret);
-            } else {
-                size_t i;
-                for (i = 0; i < mp; i++) {
-                    if (virProcessWait(workers[i], NULL) < 0)
-                        ret = EXIT_FAILURE;
-                }
-                VIR_FREE(workers);
-            }
-        }
-
-        if (virTestGetDebug())
-            fprintf(stderr, " ... OOM of %d allocs", approxAlloc);
-
-        if (ret == EXIT_SUCCESS)
-            fprintf(stderr, " OK\n");
-        else
-            fprintf(stderr, " FAILED\n");
-    }
-cleanup:
-#else
-    ret = (func)();
-#endif
 
     if (abs_srcdir_cleanup)
         VIR_FREE(abs_srcdir);