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Use better kernel api for P/E-cores (#515)

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There's a proper kernel way to check for the presence of P- and E-cores so we don't have to check the frequency differences.

Kept the frequency check in case the kernel way does not exist on the users kernel but upped the fail-safe to 10% from 5% to close #498
This commit is contained in:
Henrik Holst 2025-01-27 09:25:32 +01:00 committed by GitHub
parent 2eecd513ac
commit 1d9c1e6a72
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GPG Key ID: B5690EEEBB952194
1 changed files with 40 additions and 5 deletions
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45
daemon/gamemode-cpu.c
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@ -73,6 +73,38 @@ static int read_small_file(char *path, char **buf, size_t *buflen)
return 1;
}
static void set_online_from_list(char *cpulist, GameModeCPUInfo *info)
{
long from, to;
while ((cpulist = parse_cpulist(cpulist, &from, &to))) {
for (long cpu = from; cpu < to + 1; cpu++) {
CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online);
}
}
}
static int check_pe_cores(char **buf, size_t *buflen, GameModeCPUInfo *info)
{
if (!read_small_file("/sys/devices/cpu_core/cpus", buf, buflen))
return 0;
LOG_MSG("found kernel support for checking P/E-cores\n");
long from, to;
char *list = *buf;
while ((list = parse_cpulist(list, &from, &to))) {
for (long cpu = from; cpu < to + 1; cpu++) {
CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep);
}
}
if (CPU_EQUAL_S(CPU_ALLOC_SIZE(info->num_cpu), info->online, info->to_keep) ||
CPU_COUNT_S(CPU_ALLOC_SIZE(info->num_cpu), info->to_keep) == 0)
LOG_MSG("kernel did not indicate that this was an P/E-cores system\n");
return 1;
}
static int walk_sysfs(char *cpulist, char **buf, size_t *buflen, GameModeCPUInfo *info)
{
char path[PATH_MAX];
@ -84,8 +116,6 @@ static int walk_sysfs(char *cpulist, char **buf, size_t *buflen, GameModeCPUInfo
char *list = cpulist;
while ((list = parse_cpulist(list, &from, &to))) {
for (long cpu = from; cpu < to + 1; cpu++) {
CPU_SET_S((size_t)cpu, CPU_ALLOC_SIZE(info->num_cpu), info->online);
/* check for L3 cache non-uniformity among the cores */
int ret =
snprintf(path, PATH_MAX, "/sys/devices/system/cpu/cpu%ld/cache/index3/size", cpu);
@ -125,7 +155,7 @@ static int walk_sysfs(char *cpulist, char **buf, size_t *buflen, GameModeCPUInfo
if (ret > 0 && ret < PATH_MAX) {
if (read_small_file(path, buf, buflen)) {
unsigned long long freq = strtoull(*buf, NULL, 10);
unsigned long long cutoff = (freq * 5) / 100;
unsigned long long cutoff = (freq * 10) / 100;
if (freq > max_freq) {
if (max_freq < freq - cutoff)
@ -278,8 +308,13 @@ int game_mode_initialise_cpu(GameModeConfig *config, GameModeCPUInfo **info)
} else if (park_or_pin == IS_CPU_PIN && pin_cores[0] != '\0') {
if (!walk_string(buf, pin_cores, new_info))
goto error_exit;
} else if (!walk_sysfs(buf, &buf2, &buf2len, new_info)) {
goto error_exit;
} else {
set_online_from_list(buf, new_info);
if (!check_pe_cores(&buf2, &buf2len, new_info)) {
if (!walk_sysfs(buf, &buf2, &buf2len, new_info))
goto error_exit;
}
}
if (park_or_pin == IS_CPU_PARK &&