diff options
Diffstat (limited to 'kernel/events/internal.h')
| -rw-r--r-- | kernel/events/internal.h | 39 |
1 files changed, 38 insertions, 1 deletions
diff --git a/kernel/events/internal.h b/kernel/events/internal.h index 64568a69937..b0b107f90af 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -1,6 +1,10 @@ #ifndef _KERNEL_EVENTS_INTERNAL_H #define _KERNEL_EVENTS_INTERNAL_H +#include <linux/hardirq.h> + +/* Buffer handling */ + #define RING_BUFFER_WRITABLE 0x01 struct ring_buffer { @@ -67,7 +71,7 @@ static inline int page_order(struct ring_buffer *rb) } #endif -static unsigned long perf_data_size(struct ring_buffer *rb) +static inline unsigned long perf_data_size(struct ring_buffer *rb) { return rb->nr_pages << (PAGE_SHIFT + page_order(rb)); } @@ -96,4 +100,37 @@ __output_copy(struct perf_output_handle *handle, } while (len); } +/* Callchain handling */ +extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs); +extern int get_callchain_buffers(void); +extern void put_callchain_buffers(void); + +static inline int get_recursion_context(int *recursion) +{ + int rctx; + + if (in_nmi()) + rctx = 3; + else if (in_irq()) + rctx = 2; + else if (in_softirq()) + rctx = 1; + else + rctx = 0; + + if (recursion[rctx]) + return -1; + + recursion[rctx]++; + barrier(); + + return rctx; +} + +static inline void put_recursion_context(int *recursion, int rctx) +{ + barrier(); + recursion[rctx]--; +} + #endif /* _KERNEL_EVENTS_INTERNAL_H */ |