lock_data.h

 1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 2/* Data structures shared between BPF and tools. */
 3#ifndef UTIL_BPF_SKEL_LOCK_DATA_H
 4#define UTIL_BPF_SKEL_LOCK_DATA_H
 5
 6struct owner_tracing_data {
 7	u32 pid; // Who has the lock.
 8	u32 count; // How many waiters for this lock.
 9	u64 timestamp; // The time while the owner acquires lock and contention is going on.
10	s32 stack_id; // Identifier for `owner_stat`, which stores as value in `owner_stacks`
11};
12
13struct tstamp_data {
14	u64 timestamp;
15	u64 lock;
16	u32 flags;
17	s32 stack_id;
18};
19
20struct contention_key {
21	s32 stack_id;
22	u32 pid;
23	u64 lock_addr_or_cgroup;
24};
25
26#define TASK_COMM_LEN  16
27
28struct contention_task_data {
29	char comm[TASK_COMM_LEN];
30};
31
32/* default buffer size */
33#define MAX_ENTRIES  16384
34
35/*
36 * Upper bits of the flags in the contention_data are used to identify
37 * some well-known locks which do not have symbols (non-global locks).
38 */
39#define LCD_F_MMAP_LOCK		(1U << 31)
40#define LCD_F_SIGHAND_LOCK	(1U << 30)
41
42#define LCB_F_SLAB_ID_SHIFT	16
43#define LCB_F_SLAB_ID_START	(1U << 16)
44#define LCB_F_SLAB_ID_END	(1U << 26)
45#define LCB_F_SLAB_ID_MASK	0x03FF0000U
46
47#define LCB_F_TYPE_MAX		(1U << 7)
48#define LCB_F_TYPE_MASK		0x0000007FU
49
50#define SLAB_NAME_MAX  28
51
52struct contention_data {
53	u64 total_time;
54	u64 min_time;
55	u64 max_time;
56	u32 count;
57	u32 flags;
58};
59
60enum lock_aggr_mode {
61	LOCK_AGGR_ADDR = 0,
62	LOCK_AGGR_TASK,
63	LOCK_AGGR_CALLER,
64	LOCK_AGGR_CGROUP,
65};
66
67enum lock_class_sym {
68	LOCK_CLASS_NONE,
69	LOCK_CLASS_RQLOCK,
70	LOCK_CLASS_ZONE_LOCK,
71};
72
73struct slab_cache_data {
74	u32 id;
75	char name[SLAB_NAME_MAX];
76};
77
78#endif /* UTIL_BPF_SKEL_LOCK_DATA_H */