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scripts: Add runqemu-renice.c for renicing runqemu

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Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Richard Purdie 2020-09-05 14:58:01 +01:00
parent 01c16fa772
commit 838be1a00c
1 changed files with 44 additions and 0 deletions
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44
scripts/runqemu-renice.c Normal file
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/*
* 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);
}
}