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https://github.com/FeralInteractive/gamemode.git
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5b3b4ae638
Attribute the contributions made by members of the community, but avoid unweildy and inconsistent copyright notices at the top of each file. Existing contributor copyright notices have been left as-is.
142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*
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Copyright (c) 2017-2025, Feral Interactive and the GameMode contributors
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Feral Interactive nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE
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#include <linux/limits.h>
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#include <sched.h>
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#include <unistd.h>
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#include "common-cpu.h"
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#include "common-logging.h"
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static int write_state(char *path, int state)
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{
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FILE *f = fopen(path, "w");
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if (!f) {
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LOG_ERROR("Couldn't open file at %s (%s)\n", path, strerror(errno));
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return 0;
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}
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if (putc(state, f) == EOF) {
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LOG_ERROR("Couldn't write to file at %s (%s)\n", path, strerror(errno));
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fclose(f);
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return 0;
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}
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fclose(f);
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return 1;
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}
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static void log_state(const int state, const long first, const long last)
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{
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if (state == '0') {
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if (first == last)
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LOG_MSG("parked core %ld\n", first);
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else
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LOG_MSG("parked cores %ld - %ld\n", first, last);
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} else {
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if (first == last)
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LOG_MSG("unparked core %ld\n", first);
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else
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LOG_MSG("unparked cores %ld - %ld\n", first, last);
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}
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}
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static int set_state(char *cpulist, int state)
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{
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char path[PATH_MAX];
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long from, to;
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char *list = cpulist;
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long first = -1, last = -1;
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while ((list = parse_cpulist(list, &from, &to))) {
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for (long cpu = from; cpu < to + 1; cpu++) {
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if (snprintf(path, PATH_MAX, "/sys/devices/system/cpu/cpu%ld/online", cpu) < 0) {
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LOG_ERROR("snprintf failed, will not apply cpu core parking!\n");
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return 0;
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}
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if (!write_state(path, state)) {
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/* on some systems one cannot park core #0 */
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if (cpu != 0) {
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if (state == '0') {
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LOG_ERROR("unable to park core #%ld, will not apply cpu core parking!\n",
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cpu);
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return -1;
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}
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LOG_ERROR("unable to unpark core #%ld\n", cpu);
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}
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} else {
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if (first == -1) {
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first = cpu;
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last = cpu;
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} else if (last + 1 == cpu) {
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last = cpu;
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} else {
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log_state(state, first, last);
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first = cpu;
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last = cpu;
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}
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}
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}
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}
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if (first != -1)
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log_state(state, first, last);
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return 1;
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}
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int main(int argc, char *argv[])
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{
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if (geteuid() != 0) {
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LOG_ERROR("This program must be run as root\n");
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return EXIT_FAILURE;
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}
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if (argc == 3 && strncmp(argv[1], "online", 6) == 0) {
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if (!set_state(argv[2], '1'))
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return EXIT_FAILURE;
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} else if (argc == 3 && strncmp(argv[1], "offline", 7) == 0) {
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if (!set_state(argv[2], '0'))
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return EXIT_FAILURE;
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} else {
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fprintf(stderr, "usage: cpucorectl [online]|[offline] VALUE]\n");
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return EXIT_FAILURE;
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}
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return EXIT_SUCCESS;
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}
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