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scheduler: Apply renice configuration to clients

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This commit applies the configured nice value to the client. It accepts
values from 1 to 20, the negated value is applied as a nice value.
Negation was chosen due to limits of the configuration parser. Since low
priority values (0 to 19) make no sense in the scope of GameMode, this
is a safe approach.

Signed-off-by: Kai Krakow <kai@kaishome.de>
This commit is contained in:
Kai Krakow 2018-06-10 09:36:21 +02:00
parent 57c6bbb444
commit 6f93020d0b
1 changed files with 14 additions and 2 deletions
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16
daemon/gamemode.c
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@ -57,7 +57,7 @@ POSSIBILITY OF SUCH DAMAGE.
/* Priority to renice the process to.
*/
#define NICE_PRIORITY -4
#define NICE_DEFAULT_PRIORITY -4
/**
* The GameModeClient encapsulates the remote connection, providing a list
@ -180,12 +180,24 @@ static void game_mode_apply_scheduler(GameModeContext *self, pid_t client)
{
LOG_MSG("Setting scheduling policies...\n");
/*
* read configuration "renice" (1..20)
*/
long int renice = 0;
config_get_renice_value(self->config, &renice);
if ((renice < 1) || (renice > 20)) {
LOG_ERROR("Renice value [%ld] defaulted to [%d].\n", renice, -NICE_DEFAULT_PRIORITY);
renice = NICE_DEFAULT_PRIORITY;
} else {
renice = -renice;
}
/*
* don't adjust priority if it was already adjusted
*/
if (getpriority(PRIO_PROCESS, (id_t)client) != 0) {
LOG_ERROR("Client [%d] already reniced, ignoring.\n", client);
} else if (setpriority(PRIO_PROCESS, (id_t)client, NICE_PRIORITY)) {
} else if (setpriority(PRIO_PROCESS, (id_t)client, (int)renice)) {
LOG_ERROR("Renicing client [%d] failed with error %d, ignoring.\n", client, errno);
}