mirror of https://gitee.com/openkylin/linux.git
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/**
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* @file event_buffer.h
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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*/
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#ifndef EVENT_BUFFER_H
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#define EVENT_BUFFER_H
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#include <linux/types.h>
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#include <asm/semaphore.h>
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int alloc_event_buffer(void);
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void free_event_buffer(void);
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/* wake up the process sleeping on the event file */
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void wake_up_buffer_waiter(void);
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/* Each escaped entry is prefixed by ESCAPE_CODE
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* then one of the following codes, then the
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* relevant data.
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*/
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#define ESCAPE_CODE ~0UL
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#define CTX_SWITCH_CODE 1
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#define CPU_SWITCH_CODE 2
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#define COOKIE_SWITCH_CODE 3
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#define KERNEL_ENTER_SWITCH_CODE 4
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#define KERNEL_EXIT_SWITCH_CODE 5
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#define MODULE_LOADED_CODE 6
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#define CTX_TGID_CODE 7
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#define TRACE_BEGIN_CODE 8
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#define TRACE_END_CODE 9
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/* add data to the event buffer */
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void add_event_entry(unsigned long data);
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extern struct file_operations event_buffer_fops;
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/* mutex between sync_cpu_buffers() and the
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* file reading code.
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*/
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extern struct semaphore buffer_sem;
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#endif /* EVENT_BUFFER_H */
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