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pin every thread of the process

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walk through /proc/pid/task to make sure that we set the thread affinity for every single thread in the process
This commit is contained in:
Henrik Holst 2023-05-27 04:42:22 +02:00 committed by afayaz-feral
parent 865ffb2588
commit 9614ceca9b
1 changed files with 46 additions and 7 deletions
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53
daemon/gamemode-cpu.c
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@ -34,6 +34,7 @@ POSSIBILITY OF SUCH DAMAGE.
#include <sched.h>
#include <linux/limits.h>
#include <dirent.h>
#include "common-cpu.h"
#include "common-external.h"
@ -433,15 +434,55 @@ int game_mode_unpark_cpu(const GameModeCPUInfo *info)
return 0;
}
void game_mode_apply_core_pinning(const GameModeCPUInfo *info, const pid_t client)
static void apply_affinity_mask (pid_t pid, size_t cpusetsize, const cpu_set_t *mask, const bool be_silent)
{
char buffer[PATH_MAX];
char *proc_path = NULL;
DIR *proc_dir = NULL;
if (!(proc_path = buffered_snprintf(buffer, "/proc/%d/task", pid))) {
if (!be_silent) {
LOG_ERROR(
"Unable to find executable for PID %d: %s\n",
pid,
strerror(errno));
}
return;
}
if (!(proc_dir = opendir(proc_path))) {
if (!be_silent) {
LOG_ERROR(
"Unable to find executable for PID %d: %s\n",
pid,
strerror(errno));
}
return;
}
struct dirent *entry;
while((entry = readdir(proc_dir))) {
if (entry->d_name[0] == '.')
continue;
int tid = atoi(entry->d_name);
if (sched_setaffinity(tid, cpusetsize, mask) != 0 && !be_silent)
LOG_ERROR("Failed to pin thread %d: %s\n", tid, strerror(errno));
}
closedir(proc_dir);
}
void game_mode_apply_core_pinning(const GameModeCPUInfo *info, const pid_t client, const bool be_silent)
{
if (!info || info->park_or_pin == IS_CPU_PARK)
return;
LOG_MSG("Pinning process...\n");
if (!be_silent)
LOG_MSG("Pinning process...\n");
if (sched_setaffinity(client, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep) != 0)
LOG_ERROR("Failed to pin process: %s\n", strerror(errno));
apply_affinity_mask(client, CPU_ALLOC_SIZE(info->num_cpu), info->to_keep, be_silent);
}
void game_mode_undo_core_pinning(const GameModeCPUInfo *info, const pid_t client)
@ -450,9 +491,7 @@ void game_mode_undo_core_pinning(const GameModeCPUInfo *info, const pid_t client
return;
LOG_MSG("Pinning process back to all online cores...\n");
if (sched_setaffinity(client, CPU_ALLOC_SIZE(info->num_cpu), info->online) != 0)
LOG_ERROR("Failed to pin process: %s\n", strerror(errno));
apply_affinity_mask(client, CPU_ALLOC_SIZE(info->num_cpu), info->online, false);
}
void game_mode_free_cpu(GameModeCPUInfo **info)