mirror of
https://github.com/FeralInteractive/gamemode.git
synced 2025-06-26 01:13:13 +02:00
Added gamemode-cpu.c
Added gamemode-cpu.c which contains the functions for cpu core parking and pinning
This commit is contained in:
Henrik Holst
afayaz-feral
parent
2dbd565340
commit
495a659895
409
daemon/gamemode-cpu.c
Normal file
409
daemon/gamemode-cpu.c
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@ -0,0 +1,409 @@
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/*
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Copyright (c) 2017-2019, Feral Interactive
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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 <sched.h>
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#include <linux/limits.h>
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#include "common-external.h"
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#include "common-cpu.h"
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#include "common-helpers.h"
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#include "common-logging.h"
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#include "gamemode.h"
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#include "gamemode-config.h"
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#include "build-config.h"
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static int read_small_file (char *path, char **buf, size_t *buflen)
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{
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FILE *f = fopen(path, "r");
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if (!f) {
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LOG_ERROR("Couldn't open file at %s (%s), will not apply cpu core parking!\n", path, strerror(errno));
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return 0;
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}
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ssize_t nread = getline(buf, buflen, f);
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if (nread == -1) {
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LOG_ERROR("Couldn't read file at %s (%s), will not apply cpu core parking!\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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while (nread > 0 && ((*buf)[nread - 1] == '\n' || (*buf)[nread - 1] == '\r'))
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nread--;
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(*buf)[nread] = '\0';
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return 1;
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}
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static int walk_sysfs (char *cpulist, char **buf, size_t *buflen, GameModeCPUInfo *info)
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{
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char path[PATH_MAX];
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unsigned long long max_cache = 0;
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long from, to;
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char *list = cpulist;
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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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int ret = snprintf(path, PATH_MAX, "/sys/devices/system/cpu/cpu%ld/cache/index3/size", cpu);
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if (ret < 0 || ret >= PATH_MAX) {
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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 (!read_small_file(path, buf, buflen))
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return 0;
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char *endp;
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unsigned long long cache_size = strtoull (*buf, &endp, 10);
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if (*endp == 'K') {
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cache_size *= 1024;
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} else if (*endp == 'M') {
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cache_size *= 1024 * 1024;
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} else if (*endp == 'G') {
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cache_size *= 1024 * 1024 * 1024;
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} else if (*endp != '\0') {
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LOG_ERROR("cpu L3 cache size (%s) is silly, will not apply cpu core parking!\n", *buf);
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return 0;
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}
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if (cache_size > max_cache) {
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max_cache = cache_size;
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CPU_ZERO_S(CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
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}
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if (cache_size == max_cache)
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CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
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CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online);
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}
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}
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return 1;
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}
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static int walk_string (char *cpulist, char *config_cpulist, GameModeCPUInfo *info)
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{
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long from, to;
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char *list = cpulist;
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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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CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online);
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if (info->park_or_pin == 0)
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CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
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}
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}
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list = config_cpulist;
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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 (CPU_ISSET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online)) {
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if (info->park_or_pin == 0)
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CPU_CLR_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
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else
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CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
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}
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}
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}
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return 1;
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}
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/**
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* Attempts to identify the current in use CPU information
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*/
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int game_mode_initialise_cpu(GameModeConfig *config, GameModeCPUInfo **info)
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{
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/* Verify input, this is programmer error */
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if (!info || *info)
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FATAL_ERROR("Invalid GameModeCPUInfo passed to %s", __func__);
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/* Early out if we have this feature turned off */
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char park_cores[CONFIG_VALUE_MAX];
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char pin_cores[CONFIG_VALUE_MAX];
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config_get_cpu_park_cores(config, park_cores);
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config_get_cpu_pin_cores(config, pin_cores);
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int park_or_pin = -1;
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if (pin_cores[0] != '\0') {
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if (strcasecmp (pin_cores, "no") == 0 || strcasecmp (pin_cores, "false") == 0 || strcmp (pin_cores, "0") == 0) {
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park_or_pin = -2;
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} else if (strcasecmp (pin_cores, "yes") == 0 || strcasecmp (pin_cores, "true") == 0 || strcmp (pin_cores, "1") == 0) {
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pin_cores[0] = '\0';
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park_or_pin = 1;
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} else {
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park_or_pin = 1;
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}
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}
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if (park_or_pin < 1 && park_cores[0] != '\0') {
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if (strcasecmp (park_cores, "no") == 0 || strcasecmp (park_cores, "false") == 0 || strcmp (park_cores, "0") == 0) {
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if (park_or_pin == -2)
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return 0;
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park_or_pin = -1;
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} else if (strcasecmp (park_cores, "yes") == 0 || strcasecmp (park_cores, "true") == 0 || strcmp (park_cores, "1") == 0) {
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park_cores[0] = '\0';
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park_or_pin = 0;
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} else {
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park_or_pin = 0;
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}
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}
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/* always default to pin */
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if (park_or_pin < 0)
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park_or_pin = 1;
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char *buf = NULL, *buf2 = NULL;
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size_t buflen = 0, buf2len = 0;
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/* first we find which cores are online, this also helps us to determine the max
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* cpu core number that we need to allocate the cpulist later */
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if (!read_small_file("/sys/devices/system/cpu/online", &buf, &buflen))
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goto error_exit;
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long from, to, max = 0;
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char *s = buf;
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while ((s = parse_cpulist(s, &from, &to))) {
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if (to > max)
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max = to;
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}
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/* either parsing failed or we have only a single core, in either case
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* we cannot optimize anyway */
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if (max == 0)
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goto early_exit;
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GameModeCPUInfo *new_info = malloc(sizeof(GameModeCPUInfo));
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memset(new_info, 0, sizeof(GameModeCPUInfo));
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new_info->num_cpu = (size_t)(max + 1);
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new_info->park_or_pin = park_or_pin;
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new_info->online = CPU_ALLOC(new_info->num_cpu);
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new_info->to_keep = CPU_ALLOC(new_info->num_cpu);
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CPU_ZERO_S(CPU_ALLOC_SIZE(new_info->num_cpu), new_info->online);
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CPU_ZERO_S(CPU_ALLOC_SIZE(new_info->num_cpu), new_info->to_keep);
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if (park_or_pin == 0 && park_cores[0] != '\0') {
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if (!walk_string (buf, park_cores, new_info))
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goto error_exit;
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} else if (park_or_pin == 1 && pin_cores[0] != '\0') {
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if (!walk_string (buf, pin_cores, new_info))
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goto error_exit;
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} else if (!walk_sysfs (buf, &buf2, &buf2len, new_info)) {
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goto error_exit;
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}
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if (park_or_pin == 0 && CPU_EQUAL_S(CPU_ALLOC_SIZE(new_info->num_cpu), new_info->online, new_info->to_keep)) {
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game_mode_free_cpu(&new_info);
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LOG_MSG("cpu L3 cache is uniform, will not apply cpu core parking!\n");
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goto error_exit;
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}
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if (CPU_COUNT_S(CPU_ALLOC_SIZE(new_info->num_cpu), new_info->to_keep) == 0) {
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game_mode_free_cpu(&new_info);
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LOG_MSG("logic or config wanted to park/unpin every single cpu core, will not apply cpu core parking/pinning!\n");
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goto error_exit;
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}
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/* Give back the new cpu info */
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*info = new_info;
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early_exit:
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free (buf);
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free (buf2);
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return 0;
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error_exit:
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free (buf);
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free (buf2);
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return -1;
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}
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static int log_state (char *cpulist, int *pos, const long first, const long last)
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{
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int ret;
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if (*pos != 0) {
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ret = snprintf(cpulist+*pos, ARG_MAX - (size_t)*pos, ",");
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if (ret < 0 || (size_t)ret >= (ARG_MAX - (size_t)*pos)) {
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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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*pos += ret;
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}
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if (first == last)
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ret = snprintf(cpulist+*pos, ARG_MAX - (size_t)*pos, "%ld", first);
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else
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ret = snprintf(cpulist+*pos, ARG_MAX - (size_t)*pos, "%ld-%ld", first,last);
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if (ret < 0 || (size_t)ret >= (ARG_MAX - (size_t)*pos)) {
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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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*pos += ret;
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return 1;
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}
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/**
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* Park the unwanted cpu cores when gamemode is active
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*/
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int game_mode_park_cpu(const GameModeCPUInfo *info)
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{
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if (!info || info->park_or_pin == 1)
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return 0;
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long first = -1, last = -1;
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char cpulist[ARG_MAX];
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int pos = 0;
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for (long cpu = 0; cpu < (long)(info->num_cpu); cpu++) {
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if (CPU_ISSET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online) && !CPU_ISSET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep)) {
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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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if (!log_state (cpulist, &pos, first, last))
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return 0;
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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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if (first != -1)
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log_state (cpulist, &pos, first, last);
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const char *const exec_args[] = {
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"pkexec", LIBEXECDIR "/cpucorectl", "offline", cpulist, NULL,
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};
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LOG_MSG("Requesting parking of cores %s\n", cpulist);
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int ret = run_external_process(exec_args, NULL, -1);
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if (ret != 0) {
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LOG_ERROR("Failed to park cpu cores\n");
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return ret;
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}
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return 0;
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}
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/**
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* Restore the parked cpu cores when gamemode is disabled
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*/
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int game_mode_unpark_cpu(const GameModeCPUInfo *info)
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{
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if (!info || info->park_or_pin == 1)
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return 0;
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long first = -1, last = -1;
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char cpulist[ARG_MAX];
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int pos = 0;
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for (long cpu = 0; cpu < (long)(info->num_cpu); cpu++) {
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if (CPU_ISSET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online) && !CPU_ISSET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep)) {
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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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if (!log_state (cpulist, &pos, first, last))
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return 0;
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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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if (first != -1)
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log_state (cpulist, &pos, first, last);
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const char *const exec_args[] = {
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"pkexec", LIBEXECDIR "/cpucorectl", "online", cpulist, NULL,
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};
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LOG_MSG("Requesting unparking of cores %s\n", cpulist);
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int ret = run_external_process(exec_args, NULL, -1);
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if (ret != 0) {
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LOG_ERROR("Failed to unpark cpu cores\n");
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return ret;
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}
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return 0;
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}
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void game_mode_apply_core_pinning(const GameModeCPUInfo *info, const pid_t client)
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{
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if (!info || info->park_or_pin == 0)
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return;
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if (sched_setaffinity(client, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep) != 0)
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LOG_ERROR("Failed to pin process: %s\n", strerror(errno));
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}
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/* Simply used to free the CPU info object */
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void game_mode_free_cpu(GameModeCPUInfo **info)
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{
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if (!(*info)) {
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CPU_FREE((*info)->online);
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(*info)->online = NULL;
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CPU_FREE((*info)->to_keep);
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(*info)->to_keep = NULL;
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free(*info);
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*info = NULL;
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}
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}
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