Performance Driver

Performance driver. More...

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Detailed Description

Performance driver.

The Performance driver is exposed in the /dev/perf directory. Below is an overview of the files in this directory.

Cpu performance

The /dev/perf/cpu file contains per-CPU performance data in the following format:

cpu idle_clocks active_clocks interrupt_clocks
%lu %lu %lu %lu
%lu %lu %lu %lu
...
%lu %lu %lu %lu

Memory performance

The /dev/perf/mem file contains memory performance data in the following format:

total_pages %lu
free_pages %lu
used_pages %lu

See also

Process for per-process performance data.

Data Structures
struct	perf_process_ctx_t
struct	perf_thread_ctx_t
	Per-Thread performance context. More...
struct	stat_process_ctx_t
	Per-Process performance context. More...

Functions
void	perf_process_ctx_init (perf_process_ctx_t *ctx)
	Initializes a per-process performance context.
void	perf_thread_ctx_init (perf_thread_ctx_t *ctx)
	Initializes a per-thread performance context.
void	perf_init (void)
	Initializes the performance driver.
void	perf_interrupt_begin (void)
	Called at the beginning of an interrupt to update cpu performance data.
void	perf_interrupt_end (void)
	Called at the end of an interrupt to update cpu performance data.
void	perf_syscall_begin (void)
	Called at the beginning of a syscall to update process performance data.
void	perf_syscall_end (void)
	Called at the end of a syscall to update process performance data.

Function Documentation

perf_process_ctx_init()

void perf_process_ctx_init

(

perf_process_ctx_t *

ctx

)

Initializes a per-process performance context.

Parameters

ctx	The context to initialize.

Definition at line 137 of file perf.c.

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perf_thread_ctx_init()

void perf_thread_ctx_init

(

perf_thread_ctx_t *

ctx

)

Initializes a per-thread performance context.

Parameters

ctx	The context to initialize.

Definition at line 144 of file perf.c.

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perf_init()

void perf_init

(

void

)

Initializes the performance driver.

Definition at line 150 of file perf.c.

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perf_interrupt_begin()

void perf_interrupt_begin

(

void

)

Called at the beginning of an interrupt to update cpu performance data.

Must be called with interrupts disabled.

Definition at line 170 of file perf.c.

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perf_interrupt_end()

void perf_interrupt_end

(

void

)

Called at the end of an interrupt to update cpu performance data.

Must be called with interrupts disabled.

Definition at line 206 of file perf.c.

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perf_syscall_begin()

void perf_syscall_begin

(

void

)

Called at the beginning of a syscall to update process performance data.

Definition at line 226 of file perf.c.

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perf_syscall_end()

void perf_syscall_end

(

void

)

Called at the end of a syscall to update process performance data.

Definition at line 248 of file perf.c.

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