mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 02:34:23 +08:00
8b8b498836
Alignment was previously requested because cpu_buffer was an [NR_CPUS]
array, to avoid cache line sharing between CPUS.
After commit 608dfddd84 (oprofile: change
cpu_buffer from array to per_cpu variable ), we dont need to force an
alignement anymore since cpu_buffer sits in per_cpu zone.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Mike Travis <travis@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/**
|
|
* @file cpu_buffer.h
|
|
*
|
|
* @remark Copyright 2002 OProfile authors
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author John Levon <levon@movementarian.org>
|
|
*/
|
|
|
|
#ifndef OPROFILE_CPU_BUFFER_H
|
|
#define OPROFILE_CPU_BUFFER_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/workqueue.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/sched.h>
|
|
|
|
struct task_struct;
|
|
|
|
int alloc_cpu_buffers(void);
|
|
void free_cpu_buffers(void);
|
|
|
|
void start_cpu_work(void);
|
|
void end_cpu_work(void);
|
|
|
|
/* CPU buffer is composed of such entries (which are
|
|
* also used for context switch notes)
|
|
*/
|
|
struct op_sample {
|
|
unsigned long eip;
|
|
unsigned long event;
|
|
};
|
|
|
|
struct oprofile_cpu_buffer {
|
|
volatile unsigned long head_pos;
|
|
volatile unsigned long tail_pos;
|
|
unsigned long buffer_size;
|
|
struct task_struct * last_task;
|
|
int last_is_kernel;
|
|
int tracing;
|
|
struct op_sample * buffer;
|
|
unsigned long sample_received;
|
|
unsigned long sample_lost_overflow;
|
|
unsigned long backtrace_aborted;
|
|
unsigned long sample_invalid_eip;
|
|
int cpu;
|
|
struct delayed_work work;
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
|
|
|
|
void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
|
|
|
|
/* transient events for the CPU buffer -> event buffer */
|
|
#define CPU_IS_KERNEL 1
|
|
#define CPU_TRACE_BEGIN 2
|
|
|
|
#endif /* OPROFILE_CPU_BUFFER_H */
|