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1 | #ifndef _KERNEL_EVENTS_INTERNAL_H |
2 | #define _KERNEL_EVENTS_INTERNAL_H |
3 | |
4 | #include <linux/hardirq.h> |
5 | |
6 | /* Buffer handling */ |
7 | |
8 | #define RING_BUFFER_WRITABLE 0x01 |
9 | |
10 | struct ring_buffer { |
11 | atomic_t refcount; |
12 | struct rcu_head rcu_head; |
13 | #ifdef CONFIG_PERF_USE_VMALLOC |
14 | struct work_struct work; |
15 | int page_order; /* allocation order */ |
16 | #endif |
17 | int nr_pages; /* nr of data pages */ |
18 | int writable; /* are we writable */ |
19 | |
20 | atomic_t poll; /* POLL_ for wakeups */ |
21 | |
22 | local_t head; /* write position */ |
23 | local_t nest; /* nested writers */ |
24 | local_t events; /* event limit */ |
25 | local_t wakeup; /* wakeup stamp */ |
26 | local_t lost; /* nr records lost */ |
27 | |
28 | long watermark; /* wakeup watermark */ |
29 | /* poll crap */ |
30 | spinlock_t event_lock; |
31 | struct list_head event_list; |
32 | |
33 | struct perf_event_mmap_page *user_page; |
34 | void *data_pages[0]; |
35 | }; |
36 | |
37 | extern void rb_free(struct ring_buffer *rb); |
38 | extern struct ring_buffer * |
39 | rb_alloc(int nr_pages, long watermark, int cpu, int flags); |
40 | extern void perf_event_wakeup(struct perf_event *event); |
41 | |
42 | extern void |
43 | perf_event_header__init_id(struct perf_event_header *header, |
44 | struct perf_sample_data *data, |
45 | struct perf_event *event); |
46 | extern void |
47 | perf_event__output_id_sample(struct perf_event *event, |
48 | struct perf_output_handle *handle, |
49 | struct perf_sample_data *sample); |
50 | |
51 | extern struct page * |
52 | perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); |
53 | |
54 | #ifdef CONFIG_PERF_USE_VMALLOC |
55 | /* |
56 | * Back perf_mmap() with vmalloc memory. |
57 | * |
58 | * Required for architectures that have d-cache aliasing issues. |
59 | */ |
60 | |
61 | static inline int page_order(struct ring_buffer *rb) |
62 | { |
63 | return rb->page_order; |
64 | } |
65 | |
66 | #else |
67 | |
68 | static inline int page_order(struct ring_buffer *rb) |
69 | { |
70 | return 0; |
71 | } |
72 | #endif |
73 | |
74 | static inline unsigned long perf_data_size(struct ring_buffer *rb) |
75 | { |
76 | return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); |
77 | } |
78 | |
79 | static inline void |
80 | __output_copy(struct perf_output_handle *handle, |
81 | const void *buf, unsigned int len) |
82 | { |
83 | do { |
84 | unsigned long size = min_t(unsigned long, handle->size, len); |
85 | |
86 | memcpy(handle->addr, buf, size); |
87 | |
88 | len -= size; |
89 | handle->addr += size; |
90 | buf += size; |
91 | handle->size -= size; |
92 | if (!handle->size) { |
93 | struct ring_buffer *rb = handle->rb; |
94 | |
95 | handle->page++; |
96 | handle->page &= rb->nr_pages - 1; |
97 | handle->addr = rb->data_pages[handle->page]; |
98 | handle->size = PAGE_SIZE << page_order(rb); |
99 | } |
100 | } while (len); |
101 | } |
102 | |
103 | /* Callchain handling */ |
104 | extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs); |
105 | extern int get_callchain_buffers(void); |
106 | extern void put_callchain_buffers(void); |
107 | |
108 | static inline int get_recursion_context(int *recursion) |
109 | { |
110 | int rctx; |
111 | |
112 | if (in_nmi()) |
113 | rctx = 3; |
114 | else if (in_irq()) |
115 | rctx = 2; |
116 | else if (in_softirq()) |
117 | rctx = 1; |
118 | else |
119 | rctx = 0; |
120 | |
121 | if (recursion[rctx]) |
122 | return -1; |
123 | |
124 | recursion[rctx]++; |
125 | barrier(); |
126 | |
127 | return rctx; |
128 | } |
129 | |
130 | static inline void put_recursion_context(int *recursion, int rctx) |
131 | { |
132 | barrier(); |
133 | recursion[rctx]--; |
134 | } |
135 | |
136 | #endif /* _KERNEL_EVENTS_INTERNAL_H */ |
137 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9