perf_event.h 31.1 KB
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/*
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 * Performance events:
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 *
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 *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
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 *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
 *    Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
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 *
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 * Data type definitions, declarations, prototypes.
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 *
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 *    Started by: Thomas Gleixner and Ingo Molnar
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 *
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 * For licencing details see kernel-base/COPYING
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 */
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#ifndef _LINUX_PERF_EVENT_H
#define _LINUX_PERF_EVENT_H
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#include <linux/types.h>
#include <linux/ioctl.h>
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#include <asm/byteorder.h>
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/*
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 * User-space ABI bits:
 */

/*
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 * attr.type
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 */
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enum perf_type_id {
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	PERF_TYPE_HARDWARE			= 0,
	PERF_TYPE_SOFTWARE			= 1,
	PERF_TYPE_TRACEPOINT			= 2,
	PERF_TYPE_HW_CACHE			= 3,
	PERF_TYPE_RAW				= 4,
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	PERF_TYPE_BREAKPOINT			= 5,
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	PERF_TYPE_MAX,				/* non-ABI */
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};
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/*
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 * Generalized performance event event_id types, used by the
 * attr.event_id parameter of the sys_perf_event_open()
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 * syscall:
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 */
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enum perf_hw_id {
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	/*
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	 * Common hardware events, generalized by the kernel:
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	 */
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	PERF_COUNT_HW_CPU_CYCLES		= 0,
	PERF_COUNT_HW_INSTRUCTIONS		= 1,
	PERF_COUNT_HW_CACHE_REFERENCES		= 2,
	PERF_COUNT_HW_CACHE_MISSES		= 3,
	PERF_COUNT_HW_BRANCH_INSTRUCTIONS	= 4,
	PERF_COUNT_HW_BRANCH_MISSES		= 5,
	PERF_COUNT_HW_BUS_CYCLES		= 6,
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	PERF_COUNT_HW_STALLED_CYCLES_FRONTEND	= 7,
	PERF_COUNT_HW_STALLED_CYCLES_BACKEND	= 8,
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	PERF_COUNT_HW_MAX,			/* non-ABI */
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};
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/*
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 * Generalized hardware cache events:
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 *
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 *       { L1-D, L1-I, LLC, ITLB, DTLB, BPU, NODE } x
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 *       { read, write, prefetch } x
 *       { accesses, misses }
 */
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enum perf_hw_cache_id {
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	PERF_COUNT_HW_CACHE_L1D			= 0,
	PERF_COUNT_HW_CACHE_L1I			= 1,
	PERF_COUNT_HW_CACHE_LL			= 2,
	PERF_COUNT_HW_CACHE_DTLB		= 3,
	PERF_COUNT_HW_CACHE_ITLB		= 4,
	PERF_COUNT_HW_CACHE_BPU			= 5,
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	PERF_COUNT_HW_CACHE_NODE		= 6,
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	PERF_COUNT_HW_CACHE_MAX,		/* non-ABI */
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};

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enum perf_hw_cache_op_id {
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	PERF_COUNT_HW_CACHE_OP_READ		= 0,
	PERF_COUNT_HW_CACHE_OP_WRITE		= 1,
	PERF_COUNT_HW_CACHE_OP_PREFETCH		= 2,
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	PERF_COUNT_HW_CACHE_OP_MAX,		/* non-ABI */
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};

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enum perf_hw_cache_op_result_id {
	PERF_COUNT_HW_CACHE_RESULT_ACCESS	= 0,
	PERF_COUNT_HW_CACHE_RESULT_MISS		= 1,
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	PERF_COUNT_HW_CACHE_RESULT_MAX,		/* non-ABI */
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};

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/*
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 * Special "software" events provided by the kernel, even if the hardware
 * does not support performance events. These events measure various
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 * physical and sw events of the kernel (and allow the profiling of them as
 * well):
 */
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enum perf_sw_ids {
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	PERF_COUNT_SW_CPU_CLOCK			= 0,
	PERF_COUNT_SW_TASK_CLOCK		= 1,
	PERF_COUNT_SW_PAGE_FAULTS		= 2,
	PERF_COUNT_SW_CONTEXT_SWITCHES		= 3,
	PERF_COUNT_SW_CPU_MIGRATIONS		= 4,
	PERF_COUNT_SW_PAGE_FAULTS_MIN		= 5,
	PERF_COUNT_SW_PAGE_FAULTS_MAJ		= 6,
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	PERF_COUNT_SW_ALIGNMENT_FAULTS		= 7,
	PERF_COUNT_SW_EMULATION_FAULTS		= 8,
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	PERF_COUNT_SW_MAX,			/* non-ABI */
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};

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/*
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 * Bits that can be set in attr.sample_type to request information
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 * in the overflow packets.
 */
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enum perf_event_sample_format {
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	PERF_SAMPLE_IP				= 1U << 0,
	PERF_SAMPLE_TID				= 1U << 1,
	PERF_SAMPLE_TIME			= 1U << 2,
	PERF_SAMPLE_ADDR			= 1U << 3,
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	PERF_SAMPLE_READ			= 1U << 4,
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	PERF_SAMPLE_CALLCHAIN			= 1U << 5,
	PERF_SAMPLE_ID				= 1U << 6,
	PERF_SAMPLE_CPU				= 1U << 7,
	PERF_SAMPLE_PERIOD			= 1U << 8,
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	PERF_SAMPLE_STREAM_ID			= 1U << 9,
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	PERF_SAMPLE_RAW				= 1U << 10,
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	PERF_SAMPLE_MAX = 1U << 11,		/* non-ABI */
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};

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/*
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 * The format of the data returned by read() on a perf event fd,
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 * as specified by attr.read_format:
 *
 * struct read_format {
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 *	{ u64		value;
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 *	  { u64		time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
 *	  { u64		time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
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 *	  { u64		id;           } && PERF_FORMAT_ID
 *	} && !PERF_FORMAT_GROUP
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 *
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 *	{ u64		nr;
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 *	  { u64		time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
 *	  { u64		time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
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 *	  { u64		value;
 *	    { u64	id;           } && PERF_FORMAT_ID
 *	  }		cntr[nr];
 *	} && PERF_FORMAT_GROUP
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 * };
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 */
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enum perf_event_read_format {
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	PERF_FORMAT_TOTAL_TIME_ENABLED		= 1U << 0,
	PERF_FORMAT_TOTAL_TIME_RUNNING		= 1U << 1,
	PERF_FORMAT_ID				= 1U << 2,
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	PERF_FORMAT_GROUP			= 1U << 3,
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	PERF_FORMAT_MAX = 1U << 4,		/* non-ABI */
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};

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#define PERF_ATTR_SIZE_VER0	64	/* sizeof first published struct */

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/*
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 * Hardware event_id to monitor via a performance monitoring event:
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 */
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struct perf_event_attr {
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	/*
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	 * Major type: hardware/software/tracepoint/etc.
	 */
	__u32			type;
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	/*
	 * Size of the attr structure, for fwd/bwd compat.
	 */
	__u32			size;
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	/*
	 * Type specific configuration information.
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	 */
	__u64			config;
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	union {
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		__u64		sample_period;
		__u64		sample_freq;
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	};

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	__u64			sample_type;
	__u64			read_format;
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	__u64			disabled       :  1, /* off by default        */
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				inherit	       :  1, /* children inherit it   */
				pinned	       :  1, /* must always be on PMU */
				exclusive      :  1, /* only group on PMU     */
				exclude_user   :  1, /* don't count user      */
				exclude_kernel :  1, /* ditto kernel          */
				exclude_hv     :  1, /* ditto hypervisor      */
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				exclude_idle   :  1, /* don't count when idle */
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				mmap           :  1, /* include mmap data     */
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				comm	       :  1, /* include comm data     */
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				freq           :  1, /* use freq, not period  */
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				inherit_stat   :  1, /* per task counts       */
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				enable_on_exec :  1, /* next exec enables     */
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				task           :  1, /* trace fork/exit       */
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				watermark      :  1, /* wakeup_watermark      */
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				/*
				 * precise_ip:
				 *
				 *  0 - SAMPLE_IP can have arbitrary skid
				 *  1 - SAMPLE_IP must have constant skid
				 *  2 - SAMPLE_IP requested to have 0 skid
				 *  3 - SAMPLE_IP must have 0 skid
				 *
				 *  See also PERF_RECORD_MISC_EXACT_IP
				 */
				precise_ip     :  2, /* skid constraint       */
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				mmap_data      :  1, /* non-exec mmap data    */
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				sample_id_all  :  1, /* sample_type all events */
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				__reserved_1   : 45;
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	union {
		__u32		wakeup_events;	  /* wakeup every n events */
		__u32		wakeup_watermark; /* bytes before wakeup   */
	};
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	__u32			bp_type;
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	union {
		__u64		bp_addr;
		__u64		config1; /* extension of config */
	};
	union {
		__u64		bp_len;
		__u64		config2; /* extension of config1 */
	};
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};

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/*
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 * Ioctls that can be done on a perf event fd:
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 */
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#define PERF_EVENT_IOC_ENABLE		_IO ('$', 0)
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#define PERF_EVENT_IOC_DISABLE		_IO ('$', 1)
#define PERF_EVENT_IOC_REFRESH		_IO ('$', 2)
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#define PERF_EVENT_IOC_RESET		_IO ('$', 3)
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#define PERF_EVENT_IOC_PERIOD		_IOW('$', 4, __u64)
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#define PERF_EVENT_IOC_SET_OUTPUT	_IO ('$', 5)
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#define PERF_EVENT_IOC_SET_FILTER	_IOW('$', 6, char *)
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enum perf_event_ioc_flags {
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	PERF_IOC_FLAG_GROUP		= 1U << 0,
};
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/*
 * Structure of the page that can be mapped via mmap
 */
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struct perf_event_mmap_page {
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	__u32	version;		/* version number of this structure */
	__u32	compat_version;		/* lowest version this is compat with */
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	/*
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	 * Bits needed to read the hw events in user-space.
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	 *
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	 *   u32 seq;
	 *   s64 count;
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	 *
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	 *   do {
	 *     seq = pc->lock;
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	 *
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	 *     barrier()
	 *     if (pc->index) {
	 *       count = pmc_read(pc->index - 1);
	 *       count += pc->offset;
	 *     } else
	 *       goto regular_read;
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	 *
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	 *     barrier();
	 *   } while (pc->lock != seq);
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	 *
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	 * NOTE: for obvious reason this only works on self-monitoring
	 *       processes.
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	 */
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	__u32	lock;			/* seqlock for synchronization */
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	__u32	index;			/* hardware event identifier */
	__s64	offset;			/* add to hardware event value */
	__u64	time_enabled;		/* time event active */
	__u64	time_running;		/* time event on cpu */
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		/*
		 * Hole for extension of the self monitor capabilities
		 */

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	__u64	__reserved[123];	/* align to 1k */
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	/*
	 * Control data for the mmap() data buffer.
	 *
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	 * User-space reading the @data_head value should issue an rmb(), on
	 * SMP capable platforms, after reading this value -- see
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	 * perf_event_wakeup().
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	 *
	 * When the mapping is PROT_WRITE the @data_tail value should be
	 * written by userspace to reflect the last read data. In this case
	 * the kernel will not over-write unread data.
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	 */
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	__u64   data_head;		/* head in the data section */
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	__u64	data_tail;		/* user-space written tail */
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};

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#define PERF_RECORD_MISC_CPUMODE_MASK		(7 << 0)
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#define PERF_RECORD_MISC_CPUMODE_UNKNOWN	(0 << 0)
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#define PERF_RECORD_MISC_KERNEL			(1 << 0)
#define PERF_RECORD_MISC_USER			(2 << 0)
#define PERF_RECORD_MISC_HYPERVISOR		(3 << 0)
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#define PERF_RECORD_MISC_GUEST_KERNEL		(4 << 0)
#define PERF_RECORD_MISC_GUEST_USER		(5 << 0)
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/*
 * Indicates that the content of PERF_SAMPLE_IP points to
 * the actual instruction that triggered the event. See also
 * perf_event_attr::precise_ip.
 */
#define PERF_RECORD_MISC_EXACT_IP		(1 << 14)
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/*
 * Reserve the last bit to indicate some extended misc field
 */
#define PERF_RECORD_MISC_EXT_RESERVED		(1 << 15)

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struct perf_event_header {
	__u32	type;
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	__u16	misc;
	__u16	size;
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};

enum perf_event_type {
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	/*
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	 * If perf_event_attr.sample_id_all is set then all event types will
	 * have the sample_type selected fields related to where/when
	 * (identity) an event took place (TID, TIME, ID, CPU, STREAM_ID)
	 * described in PERF_RECORD_SAMPLE below, it will be stashed just after
	 * the perf_event_header and the fields already present for the existing
	 * fields, i.e. at the end of the payload. That way a newer perf.data
	 * file will be supported by older perf tools, with these new optional
	 * fields being ignored.
	 *
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	 * The MMAP events record the PROT_EXEC mappings so that we can
	 * correlate userspace IPs to code. They have the following structure:
	 *
	 * struct {
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	 *	struct perf_event_header	header;
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	 *
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	 *	u32				pid, tid;
	 *	u64				addr;
	 *	u64				len;
	 *	u64				pgoff;
	 *	char				filename[];
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	 * };
	 */
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	PERF_RECORD_MMAP			= 1,
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	/*
	 * struct {
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	 *	struct perf_event_header	header;
	 *	u64				id;
	 *	u64				lost;
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	 * };
	 */
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	PERF_RECORD_LOST			= 2,
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	/*
	 * struct {
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	 *	struct perf_event_header	header;
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	 *
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	 *	u32				pid, tid;
	 *	char				comm[];
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	 * };
	 */
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	PERF_RECORD_COMM			= 3,
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	/*
	 * struct {
	 *	struct perf_event_header	header;
	 *	u32				pid, ppid;
	 *	u32				tid, ptid;
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	 *	u64				time;
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	 * };
	 */
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	PERF_RECORD_EXIT			= 4,
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	/*
	 * struct {
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	 *	struct perf_event_header	header;
	 *	u64				time;
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	 *	u64				id;
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	 *	u64				stream_id;
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	 * };
	 */
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	PERF_RECORD_THROTTLE			= 5,
	PERF_RECORD_UNTHROTTLE			= 6,
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	/*
	 * struct {
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	 *	struct perf_event_header	header;
	 *	u32				pid, ppid;
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	 *	u32				tid, ptid;
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	 *	u64				time;
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	 * };
	 */
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	PERF_RECORD_FORK			= 7,
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	/*
	 * struct {
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	 *	struct perf_event_header	header;
	 *	u32				pid, tid;
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	 *
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	 *	struct read_format		values;
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	 * };
	 */
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	PERF_RECORD_READ			= 8,
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	/*
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	 * struct {
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	 *	struct perf_event_header	header;
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	 *
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	 *	{ u64			ip;	  } && PERF_SAMPLE_IP
	 *	{ u32			pid, tid; } && PERF_SAMPLE_TID
	 *	{ u64			time;     } && PERF_SAMPLE_TIME
	 *	{ u64			addr;     } && PERF_SAMPLE_ADDR
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	 *	{ u64			id;	  } && PERF_SAMPLE_ID
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	 *	{ u64			stream_id;} && PERF_SAMPLE_STREAM_ID
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	 *	{ u32			cpu, res; } && PERF_SAMPLE_CPU
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	 *	{ u64			period;   } && PERF_SAMPLE_PERIOD
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	 *
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	 *	{ struct read_format	values;	  } && PERF_SAMPLE_READ
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	 *
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	 *	{ u64			nr,
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	 *	  u64			ips[nr];  } && PERF_SAMPLE_CALLCHAIN
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	 *
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	 *	#
	 *	# The RAW record below is opaque data wrt the ABI
	 *	#
	 *	# That is, the ABI doesn't make any promises wrt to
	 *	# the stability of its content, it may vary depending
	 *	# on event, hardware, kernel version and phase of
	 *	# the moon.
	 *	#
	 *	# In other words, PERF_SAMPLE_RAW contents are not an ABI.
	 *	#
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	 *
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	 *	{ u32			size;
	 *	  char                  data[size];}&& PERF_SAMPLE_RAW
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	 * };
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	 */
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	PERF_RECORD_SAMPLE			= 9,
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	PERF_RECORD_MAX,			/* non-ABI */
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};

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enum perf_callchain_context {
	PERF_CONTEXT_HV			= (__u64)-32,
	PERF_CONTEXT_KERNEL		= (__u64)-128,
	PERF_CONTEXT_USER		= (__u64)-512,
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	PERF_CONTEXT_GUEST		= (__u64)-2048,
	PERF_CONTEXT_GUEST_KERNEL	= (__u64)-2176,
	PERF_CONTEXT_GUEST_USER		= (__u64)-2560,

	PERF_CONTEXT_MAX		= (__u64)-4095,
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};

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#define PERF_FLAG_FD_NO_GROUP		(1U << 0)
#define PERF_FLAG_FD_OUTPUT		(1U << 1)
#define PERF_FLAG_PID_CGROUP		(1U << 2) /* pid=cgroup id, per-cpu mode only */
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#ifdef __KERNEL__
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/*
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 * Kernel-internal data types and definitions:
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 */

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#ifdef CONFIG_PERF_EVENTS
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# include <linux/cgroup.h>
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# include <asm/perf_event.h>
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# include <asm/local64.h>
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#endif

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struct perf_guest_info_callbacks {
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	int				(*is_in_guest)(void);
	int				(*is_user_mode)(void);
	unsigned long			(*get_guest_ip)(void);
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};

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#ifdef CONFIG_HAVE_HW_BREAKPOINT
#include <asm/hw_breakpoint.h>
#endif

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#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
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#include <linux/hrtimer.h>
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#include <linux/fs.h>
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#include <linux/pid_namespace.h>
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#include <linux/workqueue.h>
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#include <linux/ftrace.h>
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#include <linux/cpu.h>
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#include <linux/irq_work.h>
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#include <linux/jump_label.h>
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#include <asm/atomic.h>
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#include <asm/local.h>
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#define PERF_MAX_STACK_DEPTH		255

struct perf_callchain_entry {
	__u64				nr;
	__u64				ip[PERF_MAX_STACK_DEPTH];
};

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struct perf_raw_record {
	u32				size;
	void				*data;
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};

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struct perf_branch_entry {
	__u64				from;
	__u64				to;
	__u64				flags;
};

struct perf_branch_stack {
	__u64				nr;
	struct perf_branch_entry	entries[0];
};

538 539
struct task_struct;

540 541 542 543 544 545 546 547 548 549
/*
 * extra PMU register associated with an event
 */
struct hw_perf_event_extra {
	u64		config;	/* register value */
	unsigned int	reg;	/* register address or index */
	int		alloc;	/* extra register already allocated */
	int		idx;	/* index in shared_regs->regs[] */
};

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/**
551
 * struct hw_perf_event - performance event hardware details:
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 */
553 554
struct hw_perf_event {
#ifdef CONFIG_PERF_EVENTS
555 556
	union {
		struct { /* hardware */
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			u64		config;
558
			u64		last_tag;
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			unsigned long	config_base;
560
			unsigned long	event_base;
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561
			int		idx;
562
			int		last_cpu;
563
			struct hw_perf_event_extra extra_reg;
564
		};
565
		struct { /* software */
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			struct hrtimer	hrtimer;
567
		};
568
#ifdef CONFIG_HAVE_HW_BREAKPOINT
569 570 571
		struct { /* breakpoint */
			struct arch_hw_breakpoint	info;
			struct list_head		bp_list;
572 573 574 575 576 577
			/*
			 * Crufty hack to avoid the chicken and egg
			 * problem hw_breakpoint has with context
			 * creation and event initalization.
			 */
			struct task_struct		*bp_target;
578
		};
579
#endif
580
	};
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	int				state;
582
	local64_t			prev_count;
583
	u64				sample_period;
584
	u64				last_period;
585
	local64_t			period_left;
586
	u64				interrupts;
587

588 589
	u64				freq_time_stamp;
	u64				freq_count_stamp;
590
#endif
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};

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/*
 * hw_perf_event::state flags
 */
#define PERF_HES_STOPPED	0x01 /* the counter is stopped */
#define PERF_HES_UPTODATE	0x02 /* event->count up-to-date */
#define PERF_HES_ARCH		0x04

600
struct perf_event;
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602 603 604 605
/*
 * Common implementation detail of pmu::{start,commit,cancel}_txn
 */
#define PERF_EVENT_TXN 0x1
606

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607
/**
608
 * struct pmu - generic performance monitoring unit
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609
 */
610
struct pmu {
611 612
	struct list_head		entry;

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	struct device			*dev;
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	char				*name;
	int				type;

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	int * __percpu			pmu_disable_count;
	struct perf_cpu_context * __percpu pmu_cpu_context;
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	int				task_ctx_nr;
620 621

	/*
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	 * Fully disable/enable this PMU, can be used to protect from the PMI
	 * as well as for lazy/batch writing of the MSRs.
624
	 */
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625 626
	void (*pmu_enable)		(struct pmu *pmu); /* optional */
	void (*pmu_disable)		(struct pmu *pmu); /* optional */
627

628
	/*
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	 * Try and initialize the event for this PMU.
630
	 * Should return -ENOENT when the @event doesn't match this PMU.
631
	 */
632 633
	int (*event_init)		(struct perf_event *event);

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#define PERF_EF_START	0x01		/* start the counter when adding    */
#define PERF_EF_RELOAD	0x02		/* reload the counter when starting */
#define PERF_EF_UPDATE	0x04		/* update the counter when stopping */

638
	/*
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639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
	 * Adds/Removes a counter to/from the PMU, can be done inside
	 * a transaction, see the ->*_txn() methods.
	 */
	int  (*add)			(struct perf_event *event, int flags);
	void (*del)			(struct perf_event *event, int flags);

	/*
	 * Starts/Stops a counter present on the PMU. The PMI handler
	 * should stop the counter when perf_event_overflow() returns
	 * !0. ->start() will be used to continue.
	 */
	void (*start)			(struct perf_event *event, int flags);
	void (*stop)			(struct perf_event *event, int flags);

	/*
	 * Updates the counter value of the event.
	 */
656
	void (*read)			(struct perf_event *event);
657 658

	/*
659 660 661
	 * Group events scheduling is treated as a transaction, add
	 * group events as a whole and perform one schedulability test.
	 * If the test fails, roll back the whole group
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662 663
	 *
	 * Start the transaction, after this ->add() doesn't need to
664
	 * do schedulability tests.
665
	 */
666
	void (*start_txn)		(struct pmu *pmu); /* optional */
667
	/*
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	 * If ->start_txn() disabled the ->add() schedulability test
669 670 671 672
	 * then ->commit_txn() is required to perform one. On success
	 * the transaction is closed. On error the transaction is kept
	 * open until ->cancel_txn() is called.
	 */
673
	int  (*commit_txn)		(struct pmu *pmu); /* optional */
674
	/*
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	 * Will cancel the transaction, assumes ->del() is called
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	 * for each successful ->add() during the transaction.
677
	 */
678
	void (*cancel_txn)		(struct pmu *pmu); /* optional */
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679 680
};

681
/**
682
 * enum perf_event_active_state - the states of a event
683
 */
684
enum perf_event_active_state {
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	PERF_EVENT_STATE_ERROR		= -2,
686 687
	PERF_EVENT_STATE_OFF		= -1,
	PERF_EVENT_STATE_INACTIVE	=  0,
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688
	PERF_EVENT_STATE_ACTIVE		=  1,
689 690
};

691
struct file;
692 693
struct perf_sample_data;

694
typedef void (*perf_overflow_handler_t)(struct perf_event *,
695 696 697
					struct perf_sample_data *,
					struct pt_regs *regs);

698
enum perf_group_flag {
699
	PERF_GROUP_SOFTWARE		= 0x1,
700 701
};

702 703
#define SWEVENT_HLIST_BITS		8
#define SWEVENT_HLIST_SIZE		(1 << SWEVENT_HLIST_BITS)
704 705

struct swevent_hlist {
706 707
	struct hlist_head		heads[SWEVENT_HLIST_SIZE];
	struct rcu_head			rcu_head;
708 709
};

710 711
#define PERF_ATTACH_CONTEXT	0x01
#define PERF_ATTACH_GROUP	0x02
712
#define PERF_ATTACH_TASK	0x04
713

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#ifdef CONFIG_CGROUP_PERF
/*
 * perf_cgroup_info keeps track of time_enabled for a cgroup.
 * This is a per-cpu dynamically allocated data structure.
 */
struct perf_cgroup_info {
720 721
	u64				time;
	u64				timestamp;
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};

struct perf_cgroup {
725 726
	struct				cgroup_subsys_state css;
	struct				perf_cgroup_info *info;	/* timing info, one per cpu */
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727 728 729
};
#endif

730 731
struct ring_buffer;

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/**
733
 * struct perf_event - performance event kernel representation:
T
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734
 */
735 736
struct perf_event {
#ifdef CONFIG_PERF_EVENTS
737
	struct list_head		group_entry;
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738
	struct list_head		event_entry;
739
	struct list_head		sibling_list;
740
	struct hlist_node		hlist_entry;
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741
	int				nr_siblings;
742
	int				group_flags;
743
	struct perf_event		*group_leader;
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744
	struct pmu			*pmu;
745

746
	enum perf_event_active_state	state;
747
	unsigned int			attach_state;
748
	local64_t			count;
749
	atomic64_t			child_count;
750

751
	/*
752
	 * These are the total time in nanoseconds that the event
753
	 * has been enabled (i.e. eligible to run, and the task has
754
	 * been scheduled in, if this is a per-task event)
755 756 757
	 * and running (scheduled onto the CPU), respectively.
	 *
	 * They are computed from tstamp_enabled, tstamp_running and
758
	 * tstamp_stopped when the event is in INACTIVE or ACTIVE state.
759 760 761 762 763 764
	 */
	u64				total_time_enabled;
	u64				total_time_running;

	/*
	 * These are timestamps used for computing total_time_enabled
765
	 * and total_time_running when the event is in INACTIVE or
766 767
	 * ACTIVE state, measured in nanoseconds from an arbitrary point
	 * in time.
768 769
	 * tstamp_enabled: the notional time when the event was enabled
	 * tstamp_running: the notional time when the event was scheduled on
770
	 * tstamp_stopped: in INACTIVE state, the notional time when the
771
	 *	event was scheduled off.
772 773 774 775 776
	 */
	u64				tstamp_enabled;
	u64				tstamp_running;
	u64				tstamp_stopped;

777 778 779 780 781 782 783 784 785 786
	/*
	 * timestamp shadows the actual context timing but it can
	 * be safely used in NMI interrupt context. It reflects the
	 * context time as it was when the event was last scheduled in.
	 *
	 * ctx_time already accounts for ctx->timestamp. Therefore to
	 * compute ctx_time for a sample, simply add perf_clock().
	 */
	u64				shadow_ctx_time;

787
	struct perf_event_attr		attr;
788
	u16				header_size;
789
	u16				id_header_size;
790
	u16				read_size;
791
	struct hw_perf_event		hw;
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792

793
	struct perf_event_context	*ctx;
794
	struct file			*filp;
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796 797
	/*
	 * These accumulate total time (in nanoseconds) that children
798
	 * events have been enabled and running, respectively.
799 800 801 802
	 */
	atomic64_t			child_total_time_enabled;
	atomic64_t			child_total_time_running;

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803
	/*
804
	 * Protect attach/detach and child_list:
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805
	 */
806 807
	struct mutex			child_mutex;
	struct list_head		child_list;
808
	struct perf_event		*parent;
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	int				oncpu;
	int				cpu;

813 814 815
	struct list_head		owner_entry;
	struct task_struct		*owner;

816 817 818
	/* mmap bits */
	struct mutex			mmap_mutex;
	atomic_t			mmap_count;
819 820
	int				mmap_locked;
	struct user_struct		*mmap_user;
821
	struct ring_buffer		*rb;
822

823
	/* poll related */
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824
	wait_queue_head_t		waitq;
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825
	struct fasync_struct		*fasync;
826 827 828

	/* delayed work for NMIs and such */
	int				pending_wakeup;
829
	int				pending_kill;
830
	int				pending_disable;
831
	struct irq_work			pending;
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832

833 834
	atomic_t			event_limit;

835
	void (*destroy)(struct perf_event *);
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836
	struct rcu_head			rcu_head;
837 838

	struct pid_namespace		*ns;
839
	u64				id;
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840

841
	perf_overflow_handler_t		overflow_handler;
842

843
#ifdef CONFIG_EVENT_TRACING
844
	struct ftrace_event_call	*tp_event;
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845
	struct event_filter		*filter;
846
#endif
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847

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848 849 850 851 852
#ifdef CONFIG_CGROUP_PERF
	struct perf_cgroup		*cgrp; /* cgroup event is attach to */
	int				cgrp_defer_enabled;
#endif

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853
#endif /* CONFIG_PERF_EVENTS */
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854 855
};

856 857 858 859 860
enum perf_event_context_type {
	task_context,
	cpu_context,
};

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861
/**
862
 * struct perf_event_context - event context structure
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863
 *
864
 * Used as a container for task events and CPU events as well:
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865
 */
866
struct perf_event_context {
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867
	struct pmu			*pmu;
868
	enum perf_event_context_type	type;
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869
	/*
870
	 * Protect the states of the events in the list,
871
	 * nr_active, and the list:
T
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872
	 */
873
	raw_spinlock_t			lock;
874
	/*
875
	 * Protect the list of events.  Locking either mutex or lock
876 877 878
	 * is sufficient to ensure the list doesn't change; to change
	 * the list you need to lock both the mutex and the spinlock.
	 */
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879
	struct mutex			mutex;
880

881 882
	struct list_head		pinned_groups;
	struct list_head		flexible_groups;
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883
	struct list_head		event_list;
884
	int				nr_events;
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885 886
	int				nr_active;
	int				is_active;
887
	int				nr_stat;
888
	int				rotate_disable;
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889 890
	atomic_t			refcount;
	struct task_struct		*task;
891 892

	/*
893
	 * Context clock, runs when context enabled.
894
	 */
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895 896
	u64				time;
	u64				timestamp;
897 898 899 900 901

	/*
	 * These fields let us detect when two contexts have both
	 * been cloned (inherited) from a common ancestor.
	 */
902
	struct perf_event_context	*parent_ctx;
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903 904 905
	u64				parent_gen;
	u64				generation;
	int				pin_count;
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906
	int				nr_cgroups; /* cgroup events present */
907
	struct rcu_head			rcu_head;
T
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908 909
};

910 911
/*
 * Number of contexts where an event can trigger:
912
 *	task, softirq, hardirq, nmi.
913 914 915
 */
#define PERF_NR_CONTEXTS	4

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916
/**
917
 * struct perf_event_cpu_context - per cpu event context structure
T
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918 919
 */
struct perf_cpu_context {
920 921
	struct perf_event_context	ctx;
	struct perf_event_context	*task_ctx;
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922
	int				active_oncpu;
923
	int				exclusive;
924 925
	struct list_head		rotation_list;
	int				jiffies_interval;
926
	struct pmu			*active_pmu;
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927
	struct perf_cgroup		*cgrp;
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928 929
};

930
struct perf_output_handle {
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931
	struct perf_event		*event;
932
	struct ring_buffer		*rb;
933
	unsigned long			wakeup;
934 935 936
	unsigned long			size;
	void				*addr;
	int				page;
937 938
};

939
#ifdef CONFIG_PERF_EVENTS
940

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941
extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
942
extern void perf_pmu_unregister(struct pmu *pmu);
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943

944
extern int perf_num_counters(void);
945
extern const char *perf_pmu_name(void);
946 947
extern void __perf_event_task_sched_in(struct task_struct *task);
extern void __perf_event_task_sched_out(struct task_struct *task, struct task_struct *next);
948 949 950
extern int perf_event_init_task(struct task_struct *child);
extern void perf_event_exit_task(struct task_struct *child);
extern void perf_event_free_task(struct task_struct *task);
951
extern void perf_event_delayed_put(struct task_struct *task);
952
extern void perf_event_print_debug(void);
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953 954
extern void perf_pmu_disable(struct pmu *pmu);
extern void perf_pmu_enable(struct pmu *pmu);
955 956 957
extern int perf_event_task_disable(void);
extern int perf_event_task_enable(void);
extern void perf_event_update_userpage(struct perf_event *event);
958 959 960 961
extern int perf_event_release_kernel(struct perf_event *event);
extern struct perf_event *
perf_event_create_kernel_counter(struct perf_event_attr *attr,
				int cpu,
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962
				struct task_struct *task,
963
				perf_overflow_handler_t callback);
964 965
extern u64 perf_event_read_value(struct perf_event *event,
				 u64 *enabled, u64 *running);
966

967
struct perf_sample_data {
968 969 970 971 972 973 974 975
	u64				type;

	u64				ip;
	struct {
		u32	pid;
		u32	tid;
	}				tid_entry;
	u64				time;
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976
	u64				addr;
977 978 979 980 981 982
	u64				id;
	u64				stream_id;
	struct {
		u32	cpu;
		u32	reserved;
	}				cpu_entry;
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983
	u64				period;
984
	struct perf_callchain_entry	*callchain;
985
	struct perf_raw_record		*raw;
986 987
};

988
static inline void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
989 990 991 992 993
{
	data->addr = addr;
	data->raw  = NULL;
}

994 995 996
extern void perf_output_sample(struct perf_output_handle *handle,
			       struct perf_event_header *header,
			       struct perf_sample_data *data,
997
			       struct perf_event *event);
998 999
extern void perf_prepare_sample(struct perf_event_header *header,
				struct perf_sample_data *data,
1000
				struct perf_event *event,
1001 1002
				struct pt_regs *regs);

1003
extern int perf_event_overflow(struct perf_event *event,
1004 1005
				 struct perf_sample_data *data,
				 struct pt_regs *regs);
1006

1007 1008 1009 1010 1011
static inline bool is_sampling_event(struct perf_event *event)
{
	return event->attr.sample_period != 0;
}

1012
/*
1013
 * Return 1 for a software event, 0 for a hardware event
1014
 */
1015
static inline int is_software_event(struct perf_event *event)
1016
{
1017
	return event->pmu->task_ctx_nr == perf_sw_context;
1018 1019
}

1020
extern struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
1021

1022
extern void __perf_sw_event(u32, u64, struct pt_regs *, u64);
1023

1024
#ifndef perf_arch_fetch_caller_regs
1025
static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
1026
#endif
1027 1028 1029 1030 1031 1032 1033 1034 1035

/*
 * Take a snapshot of the regs. Skip ip and frame pointer to
 * the nth caller. We only need a few of the regs:
 * - ip for PERF_SAMPLE_IP
 * - cs for user_mode() tests
 * - bp for callchains
 * - eflags, for future purposes, just in case
 */
1036
static inline void perf_fetch_caller_regs(struct pt_regs *regs)
1037 1038 1039
{
	memset(regs, 0, sizeof(*regs));

1040
	perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
1041 1042
}

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1043
static __always_inline void
1044
perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)
1045
{
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1046 1047
	struct pt_regs hot_regs;

1048 1049 1050 1051 1052
	if (static_branch(&perf_swevent_enabled[event_id])) {
		if (!regs) {
			perf_fetch_caller_regs(&hot_regs);
			regs = &hot_regs;
		}
1053
		__perf_sw_event(event_id, nr, regs, addr);
1054 1055 1056
	}
}

1057
extern struct jump_label_key perf_sched_events;
1058 1059 1060

static inline void perf_event_task_sched_in(struct task_struct *task)
{
1061 1062
	if (static_branch(&perf_sched_events))
		__perf_event_task_sched_in(task);
1063 1064
}

1065
static inline void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
1066
{
1067
	perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, NULL, 0);
1068

1069
	__perf_event_task_sched_out(task, next);
1070 1071
}

1072
extern void perf_event_mmap(struct vm_area_struct *vma);
1073
extern struct perf_guest_info_callbacks *perf_guest_cbs;
1074 1075
extern int perf_register_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
extern int perf_unregister_guest_info_callbacks(struct perf_guest_info_callbacks *callbacks);
1076

1077 1078
extern void perf_event_comm(struct task_struct *tsk);
extern void perf_event_fork(struct task_struct *tsk);
1079

1080 1081 1082
/* Callchains */
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);

1083 1084
extern void perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs);
extern void perf_callchain_kernel(struct perf_callchain_entry *entry, struct pt_regs *regs);
1085

1086
static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
1087 1088 1089 1090
{
	if (entry->nr < PERF_MAX_STACK_DEPTH)
		entry->ip[entry->nr++] = ip;
}
1091

1092 1093 1094
extern int sysctl_perf_event_paranoid;
extern int sysctl_perf_event_mlock;
extern int sysctl_perf_event_sample_rate;
1095

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Peter Zijlstra 已提交
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extern int perf_proc_update_handler(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp,
		loff_t *ppos);

1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114
static inline bool perf_paranoid_tracepoint_raw(void)
{
	return sysctl_perf_event_paranoid > -1;
}

static inline bool perf_paranoid_cpu(void)
{
	return sysctl_perf_event_paranoid > 0;
}

static inline bool perf_paranoid_kernel(void)
{
	return sysctl_perf_event_paranoid > 1;
}

1115
extern void perf_event_init(void);
1116 1117
extern void perf_tp_event(u64 addr, u64 count, void *record,
			  int entry_size, struct pt_regs *regs,
1118
			  struct hlist_head *head, int rctx);
1119
extern void perf_bp_event(struct perf_event *event, void *data);
1120

1121
#ifndef perf_misc_flags
1122 1123 1124
# define perf_misc_flags(regs) \
		(user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
# define perf_instruction_pointer(regs)	instruction_pointer(regs)
1125 1126
#endif

1127
extern int perf_output_begin(struct perf_output_handle *handle,
1128
			     struct perf_event *event, unsigned int size);
1129 1130 1131
extern void perf_output_end(struct perf_output_handle *handle);
extern void perf_output_copy(struct perf_output_handle *handle,
			     const void *buf, unsigned int len);
1132 1133
extern int perf_swevent_get_recursion_context(void);
extern void perf_swevent_put_recursion_context(int rctx);
1134 1135
extern void perf_event_enable(struct perf_event *event);
extern void perf_event_disable(struct perf_event *event);
1136
extern void perf_event_task_tick(void);
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#else
static inline void
1139
perf_event_task_sched_in(struct task_struct *task)			{ }
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Thomas Gleixner 已提交
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static inline void
1141
perf_event_task_sched_out(struct task_struct *task,
1142
			    struct task_struct *next)			{ }
1143 1144 1145
static inline int perf_event_init_task(struct task_struct *child)	{ return 0; }
static inline void perf_event_exit_task(struct task_struct *child)	{ }
static inline void perf_event_free_task(struct task_struct *task)	{ }
1146
static inline void perf_event_delayed_put(struct task_struct *task)	{ }
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Ingo Molnar 已提交
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static inline void perf_event_print_debug(void)				{ }
static inline int perf_event_task_disable(void)				{ return -EINVAL; }
static inline int perf_event_task_enable(void)				{ return -EINVAL; }
1150

1151
static inline void
1152
perf_sw_event(u32 event_id, u64 nr, struct pt_regs *regs, u64 addr)	{ }
1153
static inline void
1154
perf_bp_event(struct perf_event *event, void *data)			{ }
1155

1156
static inline int perf_register_guest_info_callbacks
1157
(struct perf_guest_info_callbacks *callbacks)				{ return 0; }
1158
static inline int perf_unregister_guest_info_callbacks
1159
(struct perf_guest_info_callbacks *callbacks)				{ return 0; }
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Ingo Molnar 已提交
1161
static inline void perf_event_mmap(struct vm_area_struct *vma)		{ }
1162 1163 1164
static inline void perf_event_comm(struct task_struct *tsk)		{ }
static inline void perf_event_fork(struct task_struct *tsk)		{ }
static inline void perf_event_init(void)				{ }
1165
static inline int  perf_swevent_get_recursion_context(void)		{ return -1; }
1166
static inline void perf_swevent_put_recursion_context(int rctx)		{ }
1167 1168
static inline void perf_event_enable(struct perf_event *event)		{ }
static inline void perf_event_disable(struct perf_event *event)		{ }
1169
static inline void perf_event_task_tick(void)				{ }
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Thomas Gleixner 已提交
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#endif

1172
#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
1173

1174 1175 1176
/*
 * This has to have a higher priority than migration_notifier in sched.c.
 */
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
#define perf_cpu_notifier(fn)						\
do {									\
	static struct notifier_block fn##_nb __cpuinitdata =		\
		{ .notifier_call = fn, .priority = CPU_PRI_PERF };	\
	fn(&fn##_nb, (unsigned long)CPU_UP_PREPARE,			\
		(void *)(unsigned long)smp_processor_id());		\
	fn(&fn##_nb, (unsigned long)CPU_STARTING,			\
		(void *)(unsigned long)smp_processor_id());		\
	fn(&fn##_nb, (unsigned long)CPU_ONLINE,				\
		(void *)(unsigned long)smp_processor_id());		\
	register_cpu_notifier(&fn##_nb);				\
1188 1189
} while (0)

1190
#endif /* __KERNEL__ */
1191
#endif /* _LINUX_PERF_EVENT_H */