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1 | /* taskstats.h - exporting per-task statistics |
2 | * | |
3 | * Copyright (C) Shailabh Nagar, IBM Corp. 2006 | |
4 | * (C) Balbir Singh, IBM Corp. 2006 | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of version 2.1 of the GNU Lesser General Public License | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it would be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
13 | */ | |
14 | ||
15 | #ifndef _LINUX_TASKSTATS_H | |
16 | #define _LINUX_TASKSTATS_H | |
17 | ||
18 | /* Format for per-task data returned to userland when | |
19 | * - a task exits | |
20 | * - listener requests stats for a task | |
21 | * | |
22 | * The struct is versioned. Newer versions should only add fields to | |
23 | * the bottom of the struct to maintain backward compatibility. | |
24 | * | |
25 | * | |
26 | * To add new fields | |
27 | * a) bump up TASKSTATS_VERSION | |
28 | * b) add comment indicating new version number at end of struct | |
29 | * c) add new fields after version comment; maintain 64-bit alignment | |
30 | */ | |
31 | ||
32 | #define TASKSTATS_VERSION 1 | |
33 | ||
34 | struct taskstats { | |
35 | ||
36 | /* Version 1 */ | |
6f44993f SN |
37 | __u16 version; |
38 | __u16 padding[3]; /* Userspace should not interpret the padding | |
39 | * field which can be replaced by useful | |
40 | * fields if struct taskstats is extended. | |
41 | */ | |
42 | ||
43 | /* Delay accounting fields start | |
44 | * | |
45 | * All values, until comment "Delay accounting fields end" are | |
46 | * available only if delay accounting is enabled, even though the last | |
47 | * few fields are not delays | |
48 | * | |
49 | * xxx_count is the number of delay values recorded | |
50 | * xxx_delay_total is the corresponding cumulative delay in nanoseconds | |
51 | * | |
52 | * xxx_delay_total wraps around to zero on overflow | |
53 | * xxx_count incremented regardless of overflow | |
54 | */ | |
55 | ||
56 | /* Delay waiting for cpu, while runnable | |
57 | * count, delay_total NOT updated atomically | |
58 | */ | |
59 | __u64 cpu_count; | |
60 | __u64 cpu_delay_total; | |
61 | ||
62 | /* Following four fields atomically updated using task->delays->lock */ | |
63 | ||
64 | /* Delay waiting for synchronous block I/O to complete | |
65 | * does not account for delays in I/O submission | |
66 | */ | |
67 | __u64 blkio_count; | |
68 | __u64 blkio_delay_total; | |
69 | ||
70 | /* Delay waiting for page fault I/O (swap in only) */ | |
71 | __u64 swapin_count; | |
72 | __u64 swapin_delay_total; | |
73 | ||
74 | /* cpu "wall-clock" running time | |
75 | * On some architectures, value will adjust for cpu time stolen | |
76 | * from the kernel in involuntary waits due to virtualization. | |
77 | * Value is cumulative, in nanoseconds, without a corresponding count | |
78 | * and wraps around to zero silently on overflow | |
79 | */ | |
80 | __u64 cpu_run_real_total; | |
81 | ||
82 | /* cpu "virtual" running time | |
83 | * Uses time intervals seen by the kernel i.e. no adjustment | |
84 | * for kernel's involuntary waits due to virtualization. | |
85 | * Value is cumulative, in nanoseconds, without a corresponding count | |
86 | * and wraps around to zero silently on overflow | |
87 | */ | |
88 | __u64 cpu_run_virtual_total; | |
89 | /* Delay accounting fields end */ | |
90 | /* version 1 ends here */ | |
c757249a SN |
91 | }; |
92 | ||
93 | ||
c757249a SN |
94 | /* |
95 | * Commands sent from userspace | |
96 | * Not versioned. New commands should only be inserted at the enum's end | |
97 | * prior to __TASKSTATS_CMD_MAX | |
98 | */ | |
99 | ||
100 | enum { | |
101 | TASKSTATS_CMD_UNSPEC = 0, /* Reserved */ | |
102 | TASKSTATS_CMD_GET, /* user->kernel request/get-response */ | |
103 | TASKSTATS_CMD_NEW, /* kernel->user event */ | |
104 | __TASKSTATS_CMD_MAX, | |
105 | }; | |
106 | ||
107 | #define TASKSTATS_CMD_MAX (__TASKSTATS_CMD_MAX - 1) | |
108 | ||
109 | enum { | |
110 | TASKSTATS_TYPE_UNSPEC = 0, /* Reserved */ | |
111 | TASKSTATS_TYPE_PID, /* Process id */ | |
112 | TASKSTATS_TYPE_TGID, /* Thread group id */ | |
113 | TASKSTATS_TYPE_STATS, /* taskstats structure */ | |
114 | TASKSTATS_TYPE_AGGR_PID, /* contains pid + stats */ | |
115 | TASKSTATS_TYPE_AGGR_TGID, /* contains tgid + stats */ | |
116 | __TASKSTATS_TYPE_MAX, | |
117 | }; | |
118 | ||
119 | #define TASKSTATS_TYPE_MAX (__TASKSTATS_TYPE_MAX - 1) | |
120 | ||
121 | enum { | |
122 | TASKSTATS_CMD_ATTR_UNSPEC = 0, | |
123 | TASKSTATS_CMD_ATTR_PID, | |
124 | TASKSTATS_CMD_ATTR_TGID, | |
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125 | TASKSTATS_CMD_ATTR_REGISTER_CPUMASK, |
126 | TASKSTATS_CMD_ATTR_DEREGISTER_CPUMASK, | |
c757249a SN |
127 | __TASKSTATS_CMD_ATTR_MAX, |
128 | }; | |
129 | ||
130 | #define TASKSTATS_CMD_ATTR_MAX (__TASKSTATS_CMD_ATTR_MAX - 1) | |
131 | ||
132 | /* NETLINK_GENERIC related info */ | |
133 | ||
134 | #define TASKSTATS_GENL_NAME "TASKSTATS" | |
135 | #define TASKSTATS_GENL_VERSION 0x1 | |
136 | ||
137 | #endif /* _LINUX_TASKSTATS_H */ |