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https://github.com/FeralInteractive/gamemode.git
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c459c05076
This is a small daemon/libary to enable games to request a performance "game mode" from the system. Currently only implemented to upgrade the CPU governor and automatically downgrade it once done. A game only needs to load libgamemodeauto to activate the request. Which means an LD_PRELOAD can be applied to any game to activate the mode as needed. However gamemode_client.h can be used to manually activate/deactivate the mode as needed, and also perform error checking. The libs are miminal loaders to call into an installed libgamemode which, if the daemon is installed and running, will send through the equivelant game mode request, and magic will happen. See the README.md for more details. Currently licensed under the BSD 3 clause license.
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/*
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Copyright (c) 2017, 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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#include "governors.h"
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#include "logging.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <linux/limits.h>
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static char initial[32];
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// Store the initial governor state to be referenced later
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void update_initial_gov_state()
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{
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static char* command = "cpugovctl get";
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FILE* f = popen( command, "r" );
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if( !f )
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FATAL_ERRORNO( "Failed to launch \"%s\" script", command );
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if( !fgets( initial, sizeof(initial)-1, f ) )
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FATAL_ERROR( "Failed to get output from \"%s\"", command );
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pclose(f);
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strtok( initial, "\n" );
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}
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// Sets all governors to a value, if NULL argument provided, will reset them back
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void set_governors( const char* value )
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{
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const char* newval = value ? value : initial;
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LOG_MSG("Setting governors to %s\n", newval ? newval : "initial values");
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char command[PATH_MAX] = {};
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snprintf( command, sizeof(command), "cpugovctl set %s", newval );
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FILE* f = popen( command, "r" );
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if( !f )
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FATAL_ERRORNO( "Failed to launch %s script", command );
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pclose(f);
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}
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// Return the initial governor
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const char* get_initial_governor()
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{
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return initial;
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}
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