Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / prctl / disable-tsc-on-off-stress-test.c

diff --git a/kernel/Documentation/prctl/disable-tsc-on-off-stress-test.c b/kernel/Documentation/prctl/disable-tsc-on-off-stress-test.c
new file mode 100644 (file)
index 0000000..4d83a27
--- /dev/null
+++ b/kernel/Documentation/prctl/disable-tsc-on-off-stress-test.c
@@ -0,0 +1,96 @@
+/*
+ * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
+ *
+ * Tests if the control register is updated correctly
+ * when set with prctl()
+ *
+ * Warning: this test will cause a very high load for a few seconds
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <inttypes.h>
+#include <wait.h>
+
+
+#include <sys/prctl.h>
+#include <linux/prctl.h>
+
+/* Get/set the process' ability to use the timestamp counter instruction */
+#ifndef PR_GET_TSC
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE         1   /* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV                2   /* throw a SIGSEGV instead of reading the TSC */
+#endif
+
+/* snippet from wikipedia :-) */
+
+static uint64_t rdtsc(void)
+{
+uint32_t lo, hi;
+/* We cannot use "=A", since this would use %rax on x86_64 */
+__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+return (uint64_t)hi << 32 | lo;
+}
+
+int should_segv = 0;
+
+static void sigsegv_cb(int sig)
+{
+       if (!should_segv)
+       {
+               fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n");
+               exit(0);
+       }
+       if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0)
+       {
+               perror("prctl");
+               exit(0);
+       }
+       should_segv = 0;
+
+       rdtsc();
+}
+
+static void task(void)
+{
+       signal(SIGSEGV, sigsegv_cb);
+       alarm(10);
+       for(;;)
+       {
+               rdtsc();
+               if (should_segv)
+               {
+                       fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n");
+                       exit(0);
+               }
+               if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0)
+               {
+                       perror("prctl");
+                       exit(0);
+               }
+               should_segv = 1;
+       }
+}
+
+
+int main(int argc, char **argv)
+{
+       int n_tasks = 100, i;
+
+       fprintf(stderr, "[No further output means we're allright]\n");
+
+       for (i=0; i<n_tasks; i++)
+               if (fork() == 0)
+                       task();
+
+       for (i=0; i<n_tasks; i++)
+               wait(NULL);
+
+       exit(0);
+}
+