mirror of
https://github.com/FeralInteractive/gamemode.git
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b7dff4265c
This pattern got a little out of hand, and was only meant for variable length values like strings
142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/*
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Copyright (c) 2017-2018, 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 "daemon_config.h"
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#include "gamemode.h"
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#include "helpers.h"
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#include "logging.h"
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#include <errno.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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/**
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* Define the syscall interface in Linux because it is missing from glibc
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*/
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#ifndef IOPRIO_BITS
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#define IOPRIO_BITS (16)
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#endif
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#ifndef IOPRIO_CLASS_SHIFT
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#define IOPRIO_CLASS_SHIFT (13)
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#endif
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#ifndef IOPRIO_PRIO_MASK
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#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
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#endif
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#ifndef IOPRIO_PRIO_CLASS
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#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
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#endif
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#ifndef IOPRIO_PRIO_DATA
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#define IOPRIO_PRIO_DATA(mask) ((mask)&IOPRIO_PRIO_MASK)
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#endif
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#ifndef IOPRIO_PRIO_VALUE
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#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
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#endif
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enum {
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IOPRIO_CLASS_NONE,
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IOPRIO_CLASS_RT,
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IOPRIO_CLASS_BE,
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IOPRIO_CLASS_IDLE,
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};
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enum {
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IOPRIO_WHO_PROCESS = 1,
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IOPRIO_WHO_PGRP,
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IOPRIO_WHO_USER,
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};
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static inline int ioprio_set(int which, int who, int ioprio)
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{
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return (int)syscall(SYS_ioprio_set, which, who, ioprio);
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}
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/**
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* Apply io priorities
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*
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* This tries to change the io priority of the client to a value specified
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* and can possibly reduce lags or latency when a game has to load assets
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* on demand.
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*/
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void game_mode_apply_ioprio(const GameModeContext *self, const pid_t client)
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{
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GameModeConfig *config = game_mode_config_from_context(self);
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LOG_MSG("Setting scheduling policies...\n");
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/*
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* read configuration "ioprio" (0..7)
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*/
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int ioprio = (int)config_get_ioprio_value(config);
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if (IOPRIO_RESET_DEFAULT == ioprio) {
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LOG_MSG("IO priority will be reset to default behavior (based on CPU priority).\n");
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ioprio = 0;
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} else if (IOPRIO_DONT_SET == ioprio) {
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return;
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} else {
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/* maybe clamp the value */
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int invalid_ioprio = ioprio;
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ioprio = CLAMP(0, 7, ioprio);
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if (ioprio != invalid_ioprio)
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LOG_ONCE(ERROR,
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"IO priority value %d invalid, clamping to %d\n",
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invalid_ioprio,
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ioprio);
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/* We support only IOPRIO_CLASS_BE as IOPRIO_CLASS_RT required CAP_SYS_ADMIN */
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ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, ioprio);
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}
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/*
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* Actually apply the io priority
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*/
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int c = IOPRIO_PRIO_CLASS(ioprio), p = IOPRIO_PRIO_DATA(ioprio);
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if (ioprio_set(IOPRIO_WHO_PROCESS, client, ioprio) == 0) {
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if (0 == ioprio)
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LOG_MSG("Resetting client [%d] IO priority.\n", client);
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else
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LOG_MSG("Setting client [%d] IO priority to (%d,%d).\n", client, c, p);
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} else {
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LOG_ERROR("Setting client [%d] IO priority to (%d,%d) failed with error %d, ignoring\n",
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client,
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c,
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p,
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errno);
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}
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}
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