qemu-pagestep is quasi-realtime when suppresing slow kernel logging

1 files changed, 34 insertions, 0 deletions

diff --git a/util/loglevel.c b/util/loglevel.c
new file mode 100644
index 0000000..e24923e
--- /dev/null
+++ b/util/loglevel.c
@@ -0,0 +1,34 @@
+#include "cachepc/uapi.h"
+
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <err.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+int
+main(int argc, const char **argv)
+{
+	uint32_t arg;
+	int fd, ret;
+
+	fd = open("/dev/kvm", O_RDONLY);
+	if (fd < 0) err(1, "open");
+
+	if (argc > 1 && !strcmp(argv[1], "debug"))
+		arg = CPC_LOGLVL_DBG;
+	else if (argc > 1 && !strcmp(argv[1], "info"))
+		arg = CPC_LOGLVL_INFO;
+	else
+		arg = 0;
+
+	printf("loglevel: %i\n", arg);
+	ret = ioctl(fd, KVM_CPC_LOGLEVEL, &arg);
+	if (ret == -1) err(1, "ioctl KVM_CPC_LOGLEVEL");
+
+	close(fd);
+}