perf_mode.c File Reference

Runtime performance optimization implementation. More...

#include "perf_mode.h"
#include "log.h"
#include "profiler.h"
#include <string.h>

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Enumerations
enum	{ PERF_RT_PRIORITY = 50 }
	Default real-time priority for SCHED_FIFO (1-99). More...
enum	{ PERF_NICE_VALUE = -10 }
	Nice value for elevated priority (-20 to 19). More...

Functions
static int	detect_gamemode (void)
	Detect if GameMode daemon is available. More...
static int	detect_native_capabilities (void)
	Detect if native scheduling capabilities are available. More...
int	perf_mode_init (PerfModeContext *ctx)
	Initialize the performance mode subsystem. More...
static int	activate_gamemode (PerfModeContext *ctx)
	Activate using GameMode backend. More...
static int	deactivate_gamemode (PerfModeContext *ctx)
	Deactivate GameMode backend. More...
static int	activate_native (PerfModeContext *ctx)
	Activate using native Linux scheduler. More...
static int	deactivate_native (PerfModeContext *ctx)
	Deactivate native Linux scheduler. More...
int	perf_mode_request_start (PerfModeContext *ctx)
	Request activation of performance mode. More...
int	perf_mode_request_end (PerfModeContext *ctx)
	Request deactivation of performance mode. More...
void	perf_mode_cleanup (PerfModeContext *ctx)
	Clean up performance mode resources. More...
PerfModeState	perf_mode_get_state (const PerfModeContext *ctx)
	Get the current performance mode state. More...
PerfModeBackend	perf_mode_get_backend (const PerfModeContext *ctx)
	Get the detected backend type. More...
const char *	perf_mode_get_state_string (const PerfModeContext *ctx)
	Get a human-readable string for the current state. More...
int	perf_mode_is_active (const PerfModeContext *ctx)
	Check if performance mode is currently active. More...

Detailed Description

Runtime performance optimization implementation.

Implements performance mode with two backends:

1. libgamemode - Preferred when gamemoded is running
2. Native Linux syscalls - Fallback using sched_setscheduler/nice

Enumeration Type Documentation

anonymous enum

anonymous enum

Default real-time priority for SCHED_FIFO (1-99).

Enumerator
PERF_RT_PRIORITY

anonymous enum

anonymous enum

Nice value for elevated priority (-20 to 19).

Enumerator
PERF_NICE_VALUE

Function Documentation

activate_gamemode()

static int activate_gamemode ( PerfModeContext *  ctx )

static

Activate using GameMode backend.

Parameters

ctx	Context ptr.

Returns

0 on success, -1 on failure.

activate_native()

static int activate_native ( PerfModeContext *  ctx )

static

Activate using native Linux scheduler.

Parameters

ctx	Context ptr.

Returns

0 on success, -1 on failure.

deactivate_gamemode()

static int deactivate_gamemode ( PerfModeContext *  ctx )

static

Deactivate GameMode backend.

Parameters

ctx	Context ptr.

Returns

0 on success, -1 on failure.

deactivate_native()

static int deactivate_native ( PerfModeContext *  ctx )

static

Deactivate native Linux scheduler.

Parameters

ctx	Context ptr.

Returns

0 on success, -1 on failure.

detect_gamemode()

static int detect_gamemode ( void  )

static

Detect if GameMode daemon is available.

Returns

1 if available, 0 otherwise.

detect_native_capabilities()

static int detect_native_capabilities ( void  )

static

Detect if native scheduling capabilities are available.

Returns

1 if SCHED_FIFO possible, 2 if only nice, 0 otherwise.

perf_mode_cleanup()

void perf_mode_cleanup

(

PerfModeContext *

ctx

)

Clean up performance mode resources.

Ensures any active optimizations are properly reverted. Should be called at application shutdown.

Parameters

ctx	Pointer to the context.

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perf_mode_get_backend()

PerfModeBackend perf_mode_get_backend

(

const PerfModeContext *

ctx

)

Get the detected backend type.

Parameters

ctx	Pointer to the context.

Returns

Detected PerfModeBackend value.

perf_mode_get_state()

PerfModeState perf_mode_get_state

(

const PerfModeContext *

ctx

)

Get the current performance mode state.

Parameters

ctx	Pointer to the context.

Returns

Current PerfModeState value.

perf_mode_get_state_string()

const char* perf_mode_get_state_string

(

const PerfModeContext *

ctx

)

Get a human-readable string for the current state.

Parameters

ctx	Pointer to the context.

Returns

Static string describing the current mode (e.g., "GameMode", "Native SCHED_FIFO", "Off").

perf_mode_init()

int perf_mode_init

(

PerfModeContext *

ctx

)

Initialize the performance mode subsystem.

Detects available backends (GameMode daemon, native capabilities). Should be called once at application startup.

Parameters

ctx	Pointer to the context to initialize.

Returns

0 on success, -1 on failure.

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perf_mode_is_active()

int perf_mode_is_active

(

const PerfModeContext *

ctx

)

Check if performance mode is currently active.

Parameters

ctx	Pointer to the context.

Returns

1 if active, 0 if not.

perf_mode_request_end()

int perf_mode_request_end

(

PerfModeContext *

ctx

)

Request deactivation of performance mode.

Reverts any system changes made by perf_mode_request_start().

Parameters

ctx	Pointer to the context.

Returns

0 on success, -1 on failure.

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perf_mode_request_start()

int perf_mode_request_start

(

PerfModeContext *

ctx

)

Request activation of performance mode.

Attempts to activate performance optimizations using the best available backend. Effects may include:

• CPU governor set to "performance"
• GPU performance mode enabled
• Process scheduling priority elevated
• Background services deprioritized

Parameters

ctx	Pointer to the context.

Returns

0 on success, -1 on failure.

Note

For native SCHED_FIFO, requires CAP_SYS_NICE or root. GameMode handles permissions via polkit.

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