#include <linux/sched.h>
#include <linux/oprofile.h>
#include <linux/errno.h>
#include "event_buffer.h"
#include "cpu_buffer.h"
#include "buffer_sync.h"
#include "oprof.h"

Macros
#define	OP_BUFFER_FLAGS 0

#define	DEFAULT_TIMER_EXPIRE (HZ / 10)

#define	RB_EVENT_HDR_SIZE 4

Functions
	DEFINE_PER_CPU (struct oprofile_cpu_buffer, op_cpu_buffer)

unsigned long	oprofile_get_cpu_buffer_size (void)

void	oprofile_cpu_buffer_inc_smpl_lost (void)

void	free_cpu_buffers (void)

int	alloc_cpu_buffers (void)

void	start_cpu_work (void)

void	end_cpu_work (void)

void	flush_cpu_work (void)

struct op_sample *	op_cpu_buffer_write_reserve (struct op_entry *entry, unsigned long size)

int	op_cpu_buffer_write_commit (struct op_entry *entry)

struct op_sample *	op_cpu_buffer_read_entry (struct op_entry *entry, int cpu)

unsigned long	op_cpu_buffer_entries (int cpu)

void	oprofile_add_ext_hw_sample (unsigned long pc, struct pt_regs const regs, unsigned long event, int is_kernel, struct task_struct task)

void	oprofile_add_ext_sample (unsigned long pc, struct pt_regs *const regs, unsigned long event, int is_kernel)

void	oprofile_add_sample (struct pt_regs *const regs, unsigned long event)

void	oprofile_write_reserve (struct op_entry entry, struct pt_regs const regs, unsigned long pc, int code, int size)

int	oprofile_add_data (struct op_entry *entry, unsigned long val)

int	oprofile_add_data64 (struct op_entry *entry, u64 val)

int	oprofile_write_commit (struct op_entry *entry)

void	oprofile_add_pc (unsigned long pc, int is_kernel, unsigned long event)

void	oprofile_add_trace (unsigned long pc)

Detailed Description

Remarks: Copyright 2002-2009 OProfile authors; Read the file COPYING

Author: John Levon levon.nosp@m.@mov.nosp@m.ement.nosp@m.aria.nosp@m.n.org; Barry Kasindorf barry.nosp@m..kas.nosp@m.indor.nosp@m.f@am.nosp@m.d.com; Robert Richter rober.nosp@m.t.ri.nosp@m.chter.nosp@m.@amd.nosp@m..com

Each CPU has a local buffer that stores PC value/event pairs. We also log context switches when we notice them. Eventually each CPU's buffer is processed into the global event buffer by sync_buffer().

We use a local buffer for two reasons: an NMI or similar interrupt cannot synchronise, and high sampling rates would lead to catastrophic global synchronisation if a global buffer was used.

Definition in file cpu_buffer.c.

Macro Definition Documentation

#define DEFAULT_TIMER_EXPIRE (HZ / 10)

Definition at line 38 of file cpu_buffer.c.

#define OP_BUFFER_FLAGS 0

Definition at line 31 of file cpu_buffer.c.

#define RB_EVENT_HDR_SIZE 4

Definition at line 60 of file cpu_buffer.c.

Function Documentation

int alloc_cpu_buffers ( void )

Definition at line 62 of file cpu_buffer.c.

DEFINE_PER_CPU	(	struct oprofile_cpu_buffer	,
		op_cpu_buffer
	)

void end_cpu_work ( void )

Definition at line 112 of file cpu_buffer.c.

void flush_cpu_work ( void )

Definition at line 117 of file cpu_buffer.c.

void free_cpu_buffers ( void )

Definition at line 53 of file cpu_buffer.c.

unsigned long op_cpu_buffer_entries ( int cpu )

Definition at line 176 of file cpu_buffer.c.

struct op_sample* op_cpu_buffer_read_entry	(	struct op_entry *	entry,
		int	cpu
	)

read

Definition at line 161 of file cpu_buffer.c.

int op_cpu_buffer_write_commit ( struct op_entry * entry )

Definition at line 156 of file cpu_buffer.c.

struct op_sample* op_cpu_buffer_write_reserve	(	struct op_entry *	entry,
		unsigned long	size
	)

read

Definition at line 142 of file cpu_buffer.c.

int oprofile_add_data	(	struct op_entry *	entry,
		unsigned long	val
	)

Definition at line 384 of file cpu_buffer.c.

int oprofile_add_data64	(	struct op_entry *	entry,
		u64	val
	)

Definition at line 391 of file cpu_buffer.c.

void oprofile_add_ext_hw_sample	(	unsigned long	pc,
		struct pt_regs *const	regs,
		unsigned long	event,
		int	is_kernel,
		struct task_struct *	task
	)

Add an hardware sample.

Definition at line 319 of file cpu_buffer.c.

void oprofile_add_ext_sample	(	unsigned long	pc,
		struct pt_regs *const	regs,
		unsigned long	event,
		int	is_kernel
	)

Add an extended sample. Use this when the PC is not from the regs, and we cannot determine if we're in kernel mode from the regs.

This function does perform a backtrace.

Definition at line 326 of file cpu_buffer.c.

void oprofile_add_pc	(	unsigned long	pc,
		int	is_kernel,
		unsigned long	event
	)

Definition at line 413 of file cpu_buffer.c.

void oprofile_add_sample	(	struct pt_regs *const	regs,
		unsigned long	event
	)

Add a sample. This may be called from any context.

Definition at line 332 of file cpu_buffer.c.

void oprofile_add_trace ( unsigned long pc )

Definition at line 419 of file cpu_buffer.c.

void oprofile_cpu_buffer_inc_smpl_lost ( void )

Definition at line 46 of file cpu_buffer.c.

unsigned long oprofile_get_cpu_buffer_size ( void )

Definition at line 41 of file cpu_buffer.c.

int oprofile_write_commit ( struct op_entry * entry )

Definition at line 406 of file cpu_buffer.c.

void oprofile_write_reserve	(	struct op_entry *	entry,
		struct pt_regs *const	regs,
		unsigned long	pc,
		int	code,
		int	size
	)

Definition at line 355 of file cpu_buffer.c.

void start_cpu_work ( void )

Definition at line 95 of file cpu_buffer.c.

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation