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![Vince Weaver](/assets/img/avatar_default.png)
Fix include/linux/perf_event.h comments to be consistent with the actual #define names. This is trivial, but it can be a bit confusing when first reading through the file. Signed-off-by: Vince Weaver <vweaver1@eecs.utk.edu> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: paulus@samba.org Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/alpine.DEB.2.00.1106031757090.29381@cl320.eecs.utk.edu Signed-off-by: Ingo Molnar <mingo@elte.hu>
1211 lines
32 KiB
C
1211 lines
32 KiB
C
/*
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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
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* 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
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#define _LINUX_PERF_EVENT_H
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#include <linux/types.h>
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#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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*/
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/*
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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,
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PERF_TYPE_SOFTWARE = 1,
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PERF_TYPE_TRACEPOINT = 2,
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PERF_TYPE_HW_CACHE = 3,
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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
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* 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,
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PERF_COUNT_HW_INSTRUCTIONS = 1,
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PERF_COUNT_HW_CACHE_REFERENCES = 2,
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PERF_COUNT_HW_CACHE_MISSES = 3,
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PERF_COUNT_HW_BRANCH_INSTRUCTIONS = 4,
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PERF_COUNT_HW_BRANCH_MISSES = 5,
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PERF_COUNT_HW_BUS_CYCLES = 6,
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PERF_COUNT_HW_STALLED_CYCLES_FRONTEND = 7,
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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 } x
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* { read, write, prefetch } x
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* { accesses, misses }
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*/
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enum perf_hw_cache_id {
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PERF_COUNT_HW_CACHE_L1D = 0,
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PERF_COUNT_HW_CACHE_L1I = 1,
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PERF_COUNT_HW_CACHE_LL = 2,
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PERF_COUNT_HW_CACHE_DTLB = 3,
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PERF_COUNT_HW_CACHE_ITLB = 4,
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PERF_COUNT_HW_CACHE_BPU = 5,
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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,
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PERF_COUNT_HW_CACHE_OP_WRITE = 1,
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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 {
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PERF_COUNT_HW_CACHE_RESULT_ACCESS = 0,
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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
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* 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
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* well):
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*/
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enum perf_sw_ids {
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PERF_COUNT_SW_CPU_CLOCK = 0,
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PERF_COUNT_SW_TASK_CLOCK = 1,
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PERF_COUNT_SW_PAGE_FAULTS = 2,
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PERF_COUNT_SW_CONTEXT_SWITCHES = 3,
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PERF_COUNT_SW_CPU_MIGRATIONS = 4,
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PERF_COUNT_SW_PAGE_FAULTS_MIN = 5,
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PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6,
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PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
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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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*/
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enum perf_event_sample_format {
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PERF_SAMPLE_IP = 1U << 0,
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PERF_SAMPLE_TID = 1U << 1,
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PERF_SAMPLE_TIME = 1U << 2,
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PERF_SAMPLE_ADDR = 1U << 3,
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PERF_SAMPLE_READ = 1U << 4,
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PERF_SAMPLE_CALLCHAIN = 1U << 5,
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PERF_SAMPLE_ID = 1U << 6,
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PERF_SAMPLE_CPU = 1U << 7,
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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:
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*
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* struct read_format {
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* { u64 value;
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* { u64 time_enabled; } && PERF_FORMAT_TOTAL_TIME_ENABLED
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* { u64 time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
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* { u64 id; } && PERF_FORMAT_ID
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* } && !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
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* { u64 time_running; } && PERF_FORMAT_TOTAL_TIME_RUNNING
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* { u64 value;
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* { u64 id; } && PERF_FORMAT_ID
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* } cntr[nr];
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* } && 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,
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PERF_FORMAT_TOTAL_TIME_RUNNING = 1U << 1,
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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.
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*/
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__u32 type;
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/*
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* Size of the attr structure, for fwd/bwd compat.
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*/
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__u32 size;
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/*
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* Type specific configuration information.
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*/
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__u64 config;
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union {
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__u64 sample_period;
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__u64 sample_freq;
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};
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__u64 sample_type;
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__u64 read_format;
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__u64 disabled : 1, /* off by default */
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inherit : 1, /* children inherit it */
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pinned : 1, /* must always be on PMU */
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exclusive : 1, /* only group on PMU */
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exclude_user : 1, /* don't count user */
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exclude_kernel : 1, /* ditto kernel */
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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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/*
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* precise_ip:
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*
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* 0 - SAMPLE_IP can have arbitrary skid
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* 1 - SAMPLE_IP must have constant skid
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* 2 - SAMPLE_IP requested to have 0 skid
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* 3 - SAMPLE_IP must have 0 skid
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*
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* See also PERF_RECORD_MISC_EXACT_IP
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*/
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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 {
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__u32 wakeup_events; /* wakeup every n events */
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__u32 wakeup_watermark; /* bytes before wakeup */
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};
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__u32 bp_type;
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union {
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__u64 bp_addr;
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__u64 config1; /* extension of config */
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};
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union {
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__u64 bp_len;
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__u64 config2; /* extension of config1 */
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};
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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)
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#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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};
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/*
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* Structure of the page that can be mapped via mmap
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*/
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struct perf_event_mmap_page {
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__u32 version; /* version number of this structure */
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__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;
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* s64 count;
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*
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* do {
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* seq = pc->lock;
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*
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* barrier()
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* if (pc->index) {
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* count = pmc_read(pc->index - 1);
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* count += pc->offset;
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* } else
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* goto regular_read;
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*
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* barrier();
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* } while (pc->lock != seq);
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*
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* NOTE: for obvious reason this only works on self-monitoring
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* processes.
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*/
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__u32 lock; /* seqlock for synchronization */
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__u32 index; /* hardware event identifier */
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__s64 offset; /* add to hardware event value */
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__u64 time_enabled; /* time event active */
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__u64 time_running; /* time event on cpu */
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/*
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* Hole for extension of the self monitor capabilities
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*/
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__u64 __reserved[123]; /* align to 1k */
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/*
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* Control data for the mmap() data buffer.
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*
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* User-space reading the @data_head value should issue an rmb(), on
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* SMP capable platforms, after reading this value -- see
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* perf_event_wakeup().
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*
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* When the mapping is PROT_WRITE the @data_tail value should be
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* written by userspace to reflect the last read data. In this case
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* 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)
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#define PERF_RECORD_MISC_USER (2 << 0)
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#define PERF_RECORD_MISC_HYPERVISOR (3 << 0)
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#define PERF_RECORD_MISC_GUEST_KERNEL (4 << 0)
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#define PERF_RECORD_MISC_GUEST_USER (5 << 0)
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/*
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* Indicates that the content of PERF_SAMPLE_IP points to
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* the actual instruction that triggered the event. See also
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* perf_event_attr::precise_ip.
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*/
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#define PERF_RECORD_MISC_EXACT_IP (1 << 14)
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/*
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* Reserve the last bit to indicate some extended misc field
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*/
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#define PERF_RECORD_MISC_EXT_RESERVED (1 << 15)
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struct perf_event_header {
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__u32 type;
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__u16 misc;
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__u16 size;
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};
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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
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* have the sample_type selected fields related to where/when
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* (identity) an event took place (TID, TIME, ID, CPU, STREAM_ID)
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* described in PERF_RECORD_SAMPLE below, it will be stashed just after
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* the perf_event_header and the fields already present for the existing
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* fields, i.e. at the end of the payload. That way a newer perf.data
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* file will be supported by older perf tools, with these new optional
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* fields being ignored.
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*
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* The MMAP events record the PROT_EXEC mappings so that we can
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* correlate userspace IPs to code. They have the following structure:
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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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* u32 pid, tid;
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* u64 addr;
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* u64 len;
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* u64 pgoff;
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* char filename[];
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* };
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*/
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PERF_RECORD_MMAP = 1,
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/*
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* struct {
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* struct perf_event_header header;
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* u64 id;
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* u64 lost;
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* };
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*/
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PERF_RECORD_LOST = 2,
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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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* u32 pid, tid;
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* char comm[];
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* };
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*/
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PERF_RECORD_COMM = 3,
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/*
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* struct {
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* struct perf_event_header header;
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* u32 pid, ppid;
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* u32 tid, ptid;
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* u64 time;
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* };
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*/
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PERF_RECORD_EXIT = 4,
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/*
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* struct {
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* struct perf_event_header header;
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* u64 time;
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* u64 id;
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* u64 stream_id;
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* };
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*/
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PERF_RECORD_THROTTLE = 5,
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PERF_RECORD_UNTHROTTLE = 6,
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/*
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* struct {
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* struct perf_event_header header;
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* u32 pid, ppid;
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* u32 tid, ptid;
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* u64 time;
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* };
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*/
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PERF_RECORD_FORK = 7,
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/*
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* struct {
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* struct perf_event_header header;
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* u32 pid, tid;
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*
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* struct read_format values;
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* };
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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
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* { u32 pid, tid; } && PERF_SAMPLE_TID
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* { u64 time; } && PERF_SAMPLE_TIME
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* { 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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* #
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* # The RAW record below is opaque data wrt the ABI
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* #
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* # That is, the ABI doesn't make any promises wrt to
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* # the stability of its content, it may vary depending
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* # on event, hardware, kernel version and phase of
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* # the moon.
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* #
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* # In other words, PERF_SAMPLE_RAW contents are not an ABI.
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* #
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*
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* { u32 size;
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* 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 {
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PERF_CONTEXT_HV = (__u64)-32,
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PERF_CONTEXT_KERNEL = (__u64)-128,
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PERF_CONTEXT_USER = (__u64)-512,
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PERF_CONTEXT_GUEST = (__u64)-2048,
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PERF_CONTEXT_GUEST_KERNEL = (__u64)-2176,
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PERF_CONTEXT_GUEST_USER = (__u64)-2560,
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PERF_CONTEXT_MAX = (__u64)-4095,
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};
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#define PERF_FLAG_FD_NO_GROUP (1U << 0)
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#define PERF_FLAG_FD_OUTPUT (1U << 1)
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#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);
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int (*is_user_mode)(void);
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unsigned long (*get_guest_ip)(void);
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};
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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#include <asm/hw_breakpoint.h>
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#endif
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#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
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struct perf_callchain_entry {
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__u64 nr;
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__u64 ip[PERF_MAX_STACK_DEPTH];
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};
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struct perf_raw_record {
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u32 size;
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void *data;
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};
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struct perf_branch_entry {
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__u64 from;
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__u64 to;
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__u64 flags;
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};
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struct perf_branch_stack {
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__u64 nr;
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struct perf_branch_entry entries[0];
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};
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struct task_struct;
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/**
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* struct hw_perf_event - performance event hardware details:
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*/
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struct hw_perf_event {
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#ifdef CONFIG_PERF_EVENTS
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union {
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struct { /* hardware */
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u64 config;
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u64 last_tag;
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unsigned long config_base;
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unsigned long event_base;
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int idx;
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int last_cpu;
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unsigned int extra_reg;
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u64 extra_config;
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int extra_alloc;
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};
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struct { /* software */
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struct hrtimer hrtimer;
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};
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#ifdef CONFIG_HAVE_HW_BREAKPOINT
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struct { /* breakpoint */
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struct arch_hw_breakpoint info;
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struct list_head bp_list;
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/*
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* Crufty hack to avoid the chicken and egg
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* problem hw_breakpoint has with context
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* creation and event initalization.
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*/
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struct task_struct *bp_target;
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};
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#endif
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};
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int state;
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local64_t prev_count;
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u64 sample_period;
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u64 last_period;
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local64_t period_left;
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u64 interrupts;
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u64 freq_time_stamp;
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u64 freq_count_stamp;
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#endif
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};
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/*
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* hw_perf_event::state flags
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*/
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#define PERF_HES_STOPPED 0x01 /* the counter is stopped */
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#define PERF_HES_UPTODATE 0x02 /* event->count up-to-date */
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#define PERF_HES_ARCH 0x04
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struct perf_event;
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/*
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* Common implementation detail of pmu::{start,commit,cancel}_txn
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*/
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#define PERF_EVENT_TXN 0x1
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/**
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* struct pmu - generic performance monitoring unit
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*/
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struct pmu {
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struct list_head entry;
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struct device *dev;
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char *name;
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int type;
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int * __percpu pmu_disable_count;
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struct perf_cpu_context * __percpu pmu_cpu_context;
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int task_ctx_nr;
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/*
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* Fully disable/enable this PMU, can be used to protect from the PMI
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* as well as for lazy/batch writing of the MSRs.
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*/
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void (*pmu_enable) (struct pmu *pmu); /* optional */
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void (*pmu_disable) (struct pmu *pmu); /* optional */
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/*
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* Try and initialize the event for this PMU.
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* Should return -ENOENT when the @event doesn't match this PMU.
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*/
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int (*event_init) (struct perf_event *event);
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#define PERF_EF_START 0x01 /* start the counter when adding */
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#define PERF_EF_RELOAD 0x02 /* reload the counter when starting */
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#define PERF_EF_UPDATE 0x04 /* update the counter when stopping */
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/*
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* Adds/Removes a counter to/from the PMU, can be done inside
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* a transaction, see the ->*_txn() methods.
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*/
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int (*add) (struct perf_event *event, int flags);
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void (*del) (struct perf_event *event, int flags);
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/*
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* Starts/Stops a counter present on the PMU. The PMI handler
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* should stop the counter when perf_event_overflow() returns
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* !0. ->start() will be used to continue.
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*/
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void (*start) (struct perf_event *event, int flags);
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void (*stop) (struct perf_event *event, int flags);
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/*
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* Updates the counter value of the event.
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*/
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void (*read) (struct perf_event *event);
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/*
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* Group events scheduling is treated as a transaction, add
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* group events as a whole and perform one schedulability test.
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* If the test fails, roll back the whole group
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*
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* Start the transaction, after this ->add() doesn't need to
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* do schedulability tests.
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*/
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void (*start_txn) (struct pmu *pmu); /* optional */
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/*
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* If ->start_txn() disabled the ->add() schedulability test
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* then ->commit_txn() is required to perform one. On success
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* the transaction is closed. On error the transaction is kept
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* open until ->cancel_txn() is called.
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*/
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int (*commit_txn) (struct pmu *pmu); /* optional */
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/*
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* Will cancel the transaction, assumes ->del() is called
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* for each successful ->add() during the transaction.
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*/
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void (*cancel_txn) (struct pmu *pmu); /* optional */
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};
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/**
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* enum perf_event_active_state - the states of a event
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*/
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enum perf_event_active_state {
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PERF_EVENT_STATE_ERROR = -2,
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PERF_EVENT_STATE_OFF = -1,
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PERF_EVENT_STATE_INACTIVE = 0,
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PERF_EVENT_STATE_ACTIVE = 1,
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};
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struct file;
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#define PERF_BUFFER_WRITABLE 0x01
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struct perf_buffer {
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atomic_t refcount;
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struct rcu_head rcu_head;
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#ifdef CONFIG_PERF_USE_VMALLOC
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struct work_struct work;
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int page_order; /* allocation order */
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#endif
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int nr_pages; /* nr of data pages */
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int writable; /* are we writable */
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atomic_t poll; /* POLL_ for wakeups */
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local_t head; /* write position */
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local_t nest; /* nested writers */
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local_t events; /* event limit */
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local_t wakeup; /* wakeup stamp */
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local_t lost; /* nr records lost */
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long watermark; /* wakeup watermark */
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struct perf_event_mmap_page *user_page;
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void *data_pages[0];
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};
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struct perf_sample_data;
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typedef void (*perf_overflow_handler_t)(struct perf_event *, int,
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struct perf_sample_data *,
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struct pt_regs *regs);
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enum perf_group_flag {
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PERF_GROUP_SOFTWARE = 0x1,
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};
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#define SWEVENT_HLIST_BITS 8
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#define SWEVENT_HLIST_SIZE (1 << SWEVENT_HLIST_BITS)
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struct swevent_hlist {
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struct hlist_head heads[SWEVENT_HLIST_SIZE];
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struct rcu_head rcu_head;
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};
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#define PERF_ATTACH_CONTEXT 0x01
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#define PERF_ATTACH_GROUP 0x02
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#define PERF_ATTACH_TASK 0x04
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#ifdef CONFIG_CGROUP_PERF
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/*
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* perf_cgroup_info keeps track of time_enabled for a cgroup.
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* This is a per-cpu dynamically allocated data structure.
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*/
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struct perf_cgroup_info {
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u64 time;
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u64 timestamp;
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};
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struct perf_cgroup {
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struct cgroup_subsys_state css;
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struct perf_cgroup_info *info; /* timing info, one per cpu */
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};
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#endif
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/**
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* struct perf_event - performance event kernel representation:
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*/
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struct perf_event {
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#ifdef CONFIG_PERF_EVENTS
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struct list_head group_entry;
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struct list_head event_entry;
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struct list_head sibling_list;
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struct hlist_node hlist_entry;
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int nr_siblings;
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int group_flags;
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struct perf_event *group_leader;
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struct pmu *pmu;
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enum perf_event_active_state state;
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unsigned int attach_state;
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local64_t count;
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atomic64_t child_count;
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/*
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* These are the total time in nanoseconds that the event
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* has been enabled (i.e. eligible to run, and the task has
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* been scheduled in, if this is a per-task event)
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* and running (scheduled onto the CPU), respectively.
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*
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* They are computed from tstamp_enabled, tstamp_running and
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* tstamp_stopped when the event is in INACTIVE or ACTIVE state.
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*/
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u64 total_time_enabled;
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u64 total_time_running;
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/*
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* These are timestamps used for computing total_time_enabled
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* and total_time_running when the event is in INACTIVE or
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* ACTIVE state, measured in nanoseconds from an arbitrary point
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* in time.
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* tstamp_enabled: the notional time when the event was enabled
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* tstamp_running: the notional time when the event was scheduled on
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* tstamp_stopped: in INACTIVE state, the notional time when the
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* event was scheduled off.
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*/
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u64 tstamp_enabled;
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u64 tstamp_running;
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u64 tstamp_stopped;
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/*
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* timestamp shadows the actual context timing but it can
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* be safely used in NMI interrupt context. It reflects the
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* context time as it was when the event was last scheduled in.
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*
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* ctx_time already accounts for ctx->timestamp. Therefore to
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* compute ctx_time for a sample, simply add perf_clock().
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*/
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u64 shadow_ctx_time;
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struct perf_event_attr attr;
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u16 header_size;
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u16 id_header_size;
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u16 read_size;
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struct hw_perf_event hw;
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struct perf_event_context *ctx;
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struct file *filp;
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/*
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* These accumulate total time (in nanoseconds) that children
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* events have been enabled and running, respectively.
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*/
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atomic64_t child_total_time_enabled;
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atomic64_t child_total_time_running;
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|
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/*
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* Protect attach/detach and child_list:
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*/
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struct mutex child_mutex;
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struct list_head child_list;
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struct perf_event *parent;
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int oncpu;
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int cpu;
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struct list_head owner_entry;
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struct task_struct *owner;
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/* mmap bits */
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struct mutex mmap_mutex;
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atomic_t mmap_count;
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int mmap_locked;
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struct user_struct *mmap_user;
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struct perf_buffer *buffer;
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/* poll related */
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wait_queue_head_t waitq;
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struct fasync_struct *fasync;
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/* delayed work for NMIs and such */
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int pending_wakeup;
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int pending_kill;
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int pending_disable;
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struct irq_work pending;
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atomic_t event_limit;
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void (*destroy)(struct perf_event *);
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struct rcu_head rcu_head;
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struct pid_namespace *ns;
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u64 id;
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perf_overflow_handler_t overflow_handler;
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#ifdef CONFIG_EVENT_TRACING
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struct ftrace_event_call *tp_event;
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struct event_filter *filter;
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#endif
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#ifdef CONFIG_CGROUP_PERF
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struct perf_cgroup *cgrp; /* cgroup event is attach to */
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int cgrp_defer_enabled;
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#endif
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#endif /* CONFIG_PERF_EVENTS */
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};
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enum perf_event_context_type {
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task_context,
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cpu_context,
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};
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|
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/**
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* struct perf_event_context - event context structure
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*
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* Used as a container for task events and CPU events as well:
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*/
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struct perf_event_context {
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struct pmu *pmu;
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enum perf_event_context_type type;
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/*
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* Protect the states of the events in the list,
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* nr_active, and the list:
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|
*/
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raw_spinlock_t lock;
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/*
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* Protect the list of events. Locking either mutex or lock
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|
* is sufficient to ensure the list doesn't change; to change
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* the list you need to lock both the mutex and the spinlock.
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*/
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struct mutex mutex;
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struct list_head pinned_groups;
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struct list_head flexible_groups;
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struct list_head event_list;
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int nr_events;
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int nr_active;
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int is_active;
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int nr_stat;
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int rotate_disable;
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|
atomic_t refcount;
|
|
struct task_struct *task;
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|
|
/*
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|
* Context clock, runs when context enabled.
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|
*/
|
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u64 time;
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u64 timestamp;
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|
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/*
|
|
* These fields let us detect when two contexts have both
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* been cloned (inherited) from a common ancestor.
|
|
*/
|
|
struct perf_event_context *parent_ctx;
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|
u64 parent_gen;
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u64 generation;
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int pin_count;
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struct rcu_head rcu_head;
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int nr_cgroups; /* cgroup events present */
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};
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|
|
/*
|
|
* Number of contexts where an event can trigger:
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|
* task, softirq, hardirq, nmi.
|
|
*/
|
|
#define PERF_NR_CONTEXTS 4
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|
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/**
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|
* struct perf_event_cpu_context - per cpu event context structure
|
|
*/
|
|
struct perf_cpu_context {
|
|
struct perf_event_context ctx;
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|
struct perf_event_context *task_ctx;
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int active_oncpu;
|
|
int exclusive;
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|
struct list_head rotation_list;
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|
int jiffies_interval;
|
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struct pmu *active_pmu;
|
|
struct perf_cgroup *cgrp;
|
|
};
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|
|
|
struct perf_output_handle {
|
|
struct perf_event *event;
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|
struct perf_buffer *buffer;
|
|
unsigned long wakeup;
|
|
unsigned long size;
|
|
void *addr;
|
|
int page;
|
|
int nmi;
|
|
int sample;
|
|
};
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|
|
#ifdef CONFIG_PERF_EVENTS
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|
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extern int perf_pmu_register(struct pmu *pmu, char *name, int type);
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extern void perf_pmu_unregister(struct pmu *pmu);
|
|
|
|
extern int perf_num_counters(void);
|
|
extern const char *perf_pmu_name(void);
|
|
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);
|
|
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);
|
|
extern void perf_event_delayed_put(struct task_struct *task);
|
|
extern void perf_event_print_debug(void);
|
|
extern void perf_pmu_disable(struct pmu *pmu);
|
|
extern void perf_pmu_enable(struct pmu *pmu);
|
|
extern int perf_event_task_disable(void);
|
|
extern int perf_event_task_enable(void);
|
|
extern void perf_event_update_userpage(struct perf_event *event);
|
|
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,
|
|
struct task_struct *task,
|
|
perf_overflow_handler_t callback);
|
|
extern u64 perf_event_read_value(struct perf_event *event,
|
|
u64 *enabled, u64 *running);
|
|
|
|
struct perf_sample_data {
|
|
u64 type;
|
|
|
|
u64 ip;
|
|
struct {
|
|
u32 pid;
|
|
u32 tid;
|
|
} tid_entry;
|
|
u64 time;
|
|
u64 addr;
|
|
u64 id;
|
|
u64 stream_id;
|
|
struct {
|
|
u32 cpu;
|
|
u32 reserved;
|
|
} cpu_entry;
|
|
u64 period;
|
|
struct perf_callchain_entry *callchain;
|
|
struct perf_raw_record *raw;
|
|
};
|
|
|
|
static inline void perf_sample_data_init(struct perf_sample_data *data, u64 addr)
|
|
{
|
|
data->addr = addr;
|
|
data->raw = NULL;
|
|
}
|
|
|
|
extern void perf_output_sample(struct perf_output_handle *handle,
|
|
struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event);
|
|
extern void perf_prepare_sample(struct perf_event_header *header,
|
|
struct perf_sample_data *data,
|
|
struct perf_event *event,
|
|
struct pt_regs *regs);
|
|
|
|
extern int perf_event_overflow(struct perf_event *event, int nmi,
|
|
struct perf_sample_data *data,
|
|
struct pt_regs *regs);
|
|
|
|
static inline bool is_sampling_event(struct perf_event *event)
|
|
{
|
|
return event->attr.sample_period != 0;
|
|
}
|
|
|
|
/*
|
|
* Return 1 for a software event, 0 for a hardware event
|
|
*/
|
|
static inline int is_software_event(struct perf_event *event)
|
|
{
|
|
return event->pmu->task_ctx_nr == perf_sw_context;
|
|
}
|
|
|
|
extern struct jump_label_key perf_swevent_enabled[PERF_COUNT_SW_MAX];
|
|
|
|
extern void __perf_sw_event(u32, u64, int, struct pt_regs *, u64);
|
|
|
|
#ifndef perf_arch_fetch_caller_regs
|
|
static inline void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip) { }
|
|
#endif
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
static inline void perf_fetch_caller_regs(struct pt_regs *regs)
|
|
{
|
|
memset(regs, 0, sizeof(*regs));
|
|
|
|
perf_arch_fetch_caller_regs(regs, CALLER_ADDR0);
|
|
}
|
|
|
|
static __always_inline void
|
|
perf_sw_event(u32 event_id, u64 nr, int nmi, struct pt_regs *regs, u64 addr)
|
|
{
|
|
struct pt_regs hot_regs;
|
|
|
|
if (static_branch(&perf_swevent_enabled[event_id])) {
|
|
if (!regs) {
|
|
perf_fetch_caller_regs(&hot_regs);
|
|
regs = &hot_regs;
|
|
}
|
|
__perf_sw_event(event_id, nr, nmi, regs, addr);
|
|
}
|
|
}
|
|
|
|
extern struct jump_label_key perf_sched_events;
|
|
|
|
static inline void perf_event_task_sched_in(struct task_struct *task)
|
|
{
|
|
if (static_branch(&perf_sched_events))
|
|
__perf_event_task_sched_in(task);
|
|
}
|
|
|
|
static inline void perf_event_task_sched_out(struct task_struct *task, struct task_struct *next)
|
|
{
|
|
perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0);
|
|
|
|
__perf_event_task_sched_out(task, next);
|
|
}
|
|
|
|
extern void perf_event_mmap(struct vm_area_struct *vma);
|
|
extern struct perf_guest_info_callbacks *perf_guest_cbs;
|
|
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);
|
|
|
|
extern void perf_event_comm(struct task_struct *tsk);
|
|
extern void perf_event_fork(struct task_struct *tsk);
|
|
|
|
/* Callchains */
|
|
DECLARE_PER_CPU(struct perf_callchain_entry, perf_callchain_entry);
|
|
|
|
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);
|
|
|
|
static inline void perf_callchain_store(struct perf_callchain_entry *entry, u64 ip)
|
|
{
|
|
if (entry->nr < PERF_MAX_STACK_DEPTH)
|
|
entry->ip[entry->nr++] = ip;
|
|
}
|
|
|
|
extern int sysctl_perf_event_paranoid;
|
|
extern int sysctl_perf_event_mlock;
|
|
extern int sysctl_perf_event_sample_rate;
|
|
|
|
extern int perf_proc_update_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *lenp,
|
|
loff_t *ppos);
|
|
|
|
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;
|
|
}
|
|
|
|
extern void perf_event_init(void);
|
|
extern void perf_tp_event(u64 addr, u64 count, void *record,
|
|
int entry_size, struct pt_regs *regs,
|
|
struct hlist_head *head, int rctx);
|
|
extern void perf_bp_event(struct perf_event *event, void *data);
|
|
|
|
#ifndef perf_misc_flags
|
|
# define perf_misc_flags(regs) \
|
|
(user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
|
|
# define perf_instruction_pointer(regs) instruction_pointer(regs)
|
|
#endif
|
|
|
|
extern int perf_output_begin(struct perf_output_handle *handle,
|
|
struct perf_event *event, unsigned int size,
|
|
int nmi, int sample);
|
|
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);
|
|
extern int perf_swevent_get_recursion_context(void);
|
|
extern void perf_swevent_put_recursion_context(int rctx);
|
|
extern void perf_event_enable(struct perf_event *event);
|
|
extern void perf_event_disable(struct perf_event *event);
|
|
extern void perf_event_task_tick(void);
|
|
#else
|
|
static inline void
|
|
perf_event_task_sched_in(struct task_struct *task) { }
|
|
static inline void
|
|
perf_event_task_sched_out(struct task_struct *task,
|
|
struct task_struct *next) { }
|
|
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) { }
|
|
static inline void perf_event_delayed_put(struct task_struct *task) { }
|
|
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; }
|
|
|
|
static inline void
|
|
perf_sw_event(u32 event_id, u64 nr, int nmi,
|
|
struct pt_regs *regs, u64 addr) { }
|
|
static inline void
|
|
perf_bp_event(struct perf_event *event, void *data) { }
|
|
|
|
static inline int perf_register_guest_info_callbacks
|
|
(struct perf_guest_info_callbacks *callbacks) { return 0; }
|
|
static inline int perf_unregister_guest_info_callbacks
|
|
(struct perf_guest_info_callbacks *callbacks) { return 0; }
|
|
|
|
static inline void perf_event_mmap(struct vm_area_struct *vma) { }
|
|
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) { }
|
|
static inline int perf_swevent_get_recursion_context(void) { return -1; }
|
|
static inline void perf_swevent_put_recursion_context(int rctx) { }
|
|
static inline void perf_event_enable(struct perf_event *event) { }
|
|
static inline void perf_event_disable(struct perf_event *event) { }
|
|
static inline void perf_event_task_tick(void) { }
|
|
#endif
|
|
|
|
#define perf_output_put(handle, x) perf_output_copy((handle), &(x), sizeof(x))
|
|
|
|
/*
|
|
* This has to have a higher priority than migration_notifier in sched.c.
|
|
*/
|
|
#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); \
|
|
} while (0)
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_PERF_EVENT_H */
|