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First pass at fix for ioprio not applying to process tree properly

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See https://github.com/FeralInteractive/gamemode/issues/140
This commit is contained in:
Marc Di Luzio 2019-05-12 19:53:16 +01:00
parent 6639b17500
commit bf2b057915
1 changed files with 46 additions and 21 deletions
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39
daemon/gamemode-ioprio.c
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@ -36,7 +36,9 @@ POSSIBILITY OF SUCH DAMAGE.
#include "helpers.h"
#include "logging.h"
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <sys/syscall.h>
#include <unistd.h>
@ -135,14 +137,35 @@ void game_mode_apply_ioprio(const GameModeContext *self, const pid_t client, int
ioprio = IOPRIO_DEFAULT;
}
int current = game_mode_get_ioprio(client);
if (current == IOPRIO_DONT_SET) {
/* Couldn't get the ioprio value, let's bail */
/* Open the tasks dir for the client */
char tasks[128];
snprintf(tasks, sizeof(tasks), "/proc/%d/task", client);
DIR *client_task_dir = opendir(tasks);
if (client_task_dir == NULL) {
LOG_ERROR("Could not inspect tasks for client %d! Skipping ioprio optimisation.\n", client);
return;
}
/* Iterate for all tasks of client process */
struct dirent *tid_entry;
while ((tid_entry = readdir(client_task_dir)) != NULL) {
/* Skip . and .. */
if (tid_entry->d_name[0] == '.')
continue;
/* task name is the name of the file */
int tid = atoi(tid_entry->d_name);
int current = game_mode_get_ioprio(tid);
if (current == IOPRIO_DONT_SET) {
/* Couldn't get the ioprio value
* This could simply mean that the thread exited before fetching the ioprio
* So we should continue
*/
} else if (current != expected) {
/* Don't try and adjust the ioprio value if the value we got doesn't match default */
LOG_ERROR("Refused to set ioprio on client [%d]: prio was (%d) but we expected (%d)\n",
client,
tid,
current,
expected);
} else {
@ -152,11 +175,13 @@ void game_mode_apply_ioprio(const GameModeContext *self, const pid_t client, int
*/
int p = ioprio;
ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, ioprio);
if (ioprio_set(IOPRIO_WHO_PROCESS, client, ioprio) != 0) {
LOG_ERROR("Setting client [%d] IO priority to (%d) failed with error %d, ignoring\n",
client,
if (ioprio_set(IOPRIO_WHO_PROCESS, tid, ioprio) != 0) {
LOG_ERROR(
"Setting client [%d] IO priority to (%d) failed with error %d, ignoring\n",
tid,
p,
errno);
}
}
}
}