From: Richard Purdie <[email protected]>
Signed-off-by: Richard Purdie <[email protected]>
(cherry picked from commit 838be1a00c0383b63d1ab60aa991919404b82655)
Signed-off-by: Steve Sakoman <[email protected]>
---
scripts/runqemu-renice.c | 44 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 44 insertions(+)
create mode 100644 scripts/runqemu-renice.c
diff --git a/scripts/runqemu-renice.c b/scripts/runqemu-renice.c
new file mode 100644
index 0000000..9003e35
--- /dev/null
+++ b/scripts/runqemu-renice.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2020 Richard Purdie
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Needs sudo setcap 'cap_sys_nice=ep' renice
+ */
+
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+enum {
+ IOPRIO_WHO_PROCESS = 1,
+};
+
+#define IOPRIO_CLASS_SHIFT 13
+#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
+#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
+#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
+#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
+
+int main(int argc, char *argv[])
+{
+ int pid, rc;
+ if (argc != 2) {
+ printf("Please specify only the process PID to adjust\n");
+ exit(1);
+ }
+ pid = atoi(argv[1]);
+ rc = setpriority(PRIO_PROCESS, pid, -5);
+ if (rc != 0) {
+ printf("setpriority failed: %d\n", rc);
+ exit(1);
+ }
+ rc = syscall(__NR_ioprio_set, IOPRIO_WHO_PROCESS, pid,
IOPRIO_PRIO_VALUE(2, 0));
+ if (rc != 0) {
+ printf("ioprio_set failed: %d\n", rc);
+ exit(1);
+ }
+}
--
2.25.1
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