1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2014-2018 Remy Noel.
* Copyright (c) 2014-2018 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* Isolated type definitions used to avoid inclusion circular dependencies.
*/
#ifndef KERN_PERFMON_TYPES_H
#define KERN_PERFMON_TYPES_H
#ifdef CONFIG_PERFMON
#include <stdbool.h>
#include <stdint.h>
#include <kern/spinlock_types.h>
/*
* Maximum number of supported hardware counters.
*/
#define PERFMON_MAX_PMCS CONFIG_PERFMON_MAX_PMCS
/*
* Performance monitoring event.
*
* An event may be unattached, attached to a thread, or attached to a CPU.
* When it is loaded, the current value of the underlying PMC is saved.
* When it is updated, the delta between the current and saved PMC values
* is added to the event value.
*/
struct perfmon_event {
struct spinlock lock;
unsigned int flags;
unsigned int id;
uint64_t pmc_value;
uint64_t value;
union {
struct thread *thread;
unsigned int cpu;
};
unsigned int pmc_index;
};
/*
* Per-thread performance monitoring counter.
*
* Per-thread PMCs are indexed the same way as global PMCs.
*
* A per-thread PMC is referenced when an event is attached to a thread.
* The PMC may only be loaded if the thread is running on a processor,
* as a result of an event being attached to the thread, or the thread
* being dispatched by the scheduler. Note that this allows a transient
* state to be seen where a per-thread PMC is both unused and loaded.
* This happens after detaching an event from a thread, resulting in
* the underlying per-thread PMC to become unused, but if the thread
* is running concurrently, the counter is still loaded. The implementation
* resolves the situation by unloading the counter, which is either
* done by an explicit unload cross-call, or when the scheduler preempts
* the thread and unloads its thread data.
*
* When a per-thread PMC is loaded, the current value of the underlying
* PMC is saved, and when it's updated, the delta between the current
* and saved PMC values is added to the per-thread PMC value.
*/
struct perfmon_td_pmc {
unsigned int nr_refs;
bool loaded;
unsigned int pmc_id;
unsigned int raw_event_id;
uint64_t cpu_pmc_value;
uint64_t value;
};
/*
* Per-thread performance monitoring data.
*
* Interrupts must be disabled when locking thread data.
*/
struct perfmon_td {
struct spinlock lock;
struct perfmon_td_pmc pmcs[PERFMON_MAX_PMCS];
};
#endif /* CONFIG_PERFMON */
#endif /* KERN_PERFMON_TYPES_H */
|
