ia64/linux-2.6.18-xen.hg

view drivers/oprofile/cpu_buffer.h @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 132f24200f4c
children
line source
1 /**
2 * @file cpu_buffer.h
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon <levon@movementarian.org>
8 */
10 #ifndef OPROFILE_CPU_BUFFER_H
11 #define OPROFILE_CPU_BUFFER_H
13 #include <linux/types.h>
14 #include <linux/spinlock.h>
15 #include <linux/workqueue.h>
16 #include <linux/cache.h>
18 struct task_struct;
20 int alloc_cpu_buffers(void);
21 void free_cpu_buffers(void);
23 void start_cpu_work(void);
24 void end_cpu_work(void);
26 /* CPU buffer is composed of such entries (which are
27 * also used for context switch notes)
28 */
29 struct op_sample {
30 unsigned long eip;
31 unsigned long event;
32 };
34 struct oprofile_cpu_buffer {
35 volatile unsigned long head_pos;
36 volatile unsigned long tail_pos;
37 unsigned long buffer_size;
38 struct task_struct * last_task;
39 int last_cpu_mode;
40 int tracing;
41 struct op_sample * buffer;
42 unsigned long sample_received;
43 unsigned long sample_lost_overflow;
44 unsigned long backtrace_aborted;
45 int cpu;
46 struct work_struct work;
47 } ____cacheline_aligned;
49 extern struct oprofile_cpu_buffer cpu_buffer[];
51 void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
53 /* transient events for the CPU buffer -> event buffer */
54 #define CPU_MODE_USER 0
55 #define CPU_MODE_KERNEL 1
56 #define CPU_MODE_XEN 2
57 #define CPU_TRACE_BEGIN 3
58 #define CPU_DOMAIN_SWITCH 4
60 #endif /* OPROFILE_CPU_BUFFER_H */