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1 | .\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com> |
2 | .\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com> | |
3 | .\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org> | |
4 | .\" | |
5 | .\" SPDX-License-Identifier: GPL-3.0-or-later | |
6 | .\" | |
7 | .TH proc_stat 5 (date) "Linux man-pages (unreleased)" | |
8 | .SH NAME | |
9 | /proc/stat \- kernel system statistics | |
10 | .SH DESCRIPTION | |
11 | .TP | |
12 | .I /proc/stat | |
13 | kernel/system statistics. | |
14 | Varies with architecture. | |
15 | Common | |
16 | entries include: | |
17 | .RS | |
18 | .TP | |
19 | .I cpu 10132153 290696 3084719 46828483 16683 0 25195 0 175628 0 | |
20 | .TQ | |
21 | .I cpu0 1393280 32966 572056 13343292 6130 0 17875 0 23933 0 | |
22 | The amount of time, measured in units of | |
23 | USER_HZ (1/100ths of a second on most architectures, use | |
24 | .I sysconf(_SC_CLK_TCK) | |
25 | to obtain the right value), | |
26 | .\" 1024 on Alpha and ia64 | |
27 | that the system ("cpu" line) or the specific CPU ("cpu\fIN\fR" line) | |
28 | spent in various states: | |
29 | .RS | |
30 | .TP | |
31 | .I user | |
32 | (1) Time spent in user mode. | |
33 | .TP | |
34 | .I nice | |
35 | (2) Time spent in user mode with low priority (nice). | |
36 | .TP | |
37 | .I system | |
38 | (3) Time spent in system mode. | |
39 | .TP | |
40 | .I idle | |
41 | (4) Time spent in the idle task. | |
42 | .\" FIXME . Actually, the following info about the /proc/stat 'cpu' field | |
43 | .\" does not seem to be quite right (at least in Linux 2.6.12 or Linux 3.6): | |
44 | .\" the idle time in /proc/uptime does not quite match this value | |
45 | This value should be USER_HZ times the | |
46 | second entry in the | |
47 | .I /proc/uptime | |
48 | pseudo-file. | |
49 | .TP | |
50 | .IR iowait " (since Linux 2.5.41)" | |
51 | (5) Time waiting for I/O to complete. | |
52 | This value is not reliable, for the following reasons: | |
53 | .\" See kernel commit 9c240d757658a3ae9968dd309e674c61f07c7f48 | |
54 | .RS | |
55 | .IP \[bu] 3 | |
56 | The CPU will not wait for I/O to complete; | |
57 | iowait is the time that a task is waiting for I/O to complete. | |
58 | When a CPU goes into idle state for outstanding task I/O, | |
59 | another task will be scheduled on this CPU. | |
60 | .IP \[bu] | |
61 | On a multi-core CPU, | |
62 | the task waiting for I/O to complete is not running on any CPU, | |
63 | so the iowait of each CPU is difficult to calculate. | |
64 | .IP \[bu] | |
65 | The value in this field may | |
66 | .I decrease | |
67 | in certain conditions. | |
68 | .RE | |
69 | .TP | |
70 | .IR irq " (since Linux 2.6.0)" | |
71 | .\" Precisely: Linux 2.6.0-test4 | |
72 | (6) Time servicing interrupts. | |
73 | .TP | |
74 | .IR softirq " (since Linux 2.6.0)" | |
75 | .\" Precisely: Linux 2.6.0-test4 | |
76 | (7) Time servicing softirqs. | |
77 | .TP | |
78 | .IR steal " (since Linux 2.6.11)" | |
79 | (8) Stolen time, which is the time spent in other operating systems when | |
80 | running in a virtualized environment | |
81 | .TP | |
82 | .IR guest " (since Linux 2.6.24)" | |
83 | (9) Time spent running a virtual CPU for guest | |
84 | operating systems under the control of the Linux kernel. | |
85 | .\" See Changelog entry for 5e84cfde51cf303d368fcb48f22059f37b3872de | |
86 | .TP | |
87 | .IR guest_nice " (since Linux 2.6.33)" | |
88 | .\" commit ce0e7b28fb75cb003cfc8d0238613aaf1c55e797 | |
89 | (10) Time spent running a niced guest (virtual CPU for guest | |
90 | operating systems under the control of the Linux kernel). | |
91 | .RE | |
92 | .TP | |
93 | \fIpage 5741 1808\fP | |
94 | The number of pages the system paged in and the number that were paged | |
95 | out (from disk). | |
96 | .TP | |
97 | \fIswap 1 0\fP | |
98 | The number of swap pages that have been brought in and out. | |
99 | .TP | |
100 | .\" FIXME . The following is not the full picture for the 'intr' of | |
101 | .\" /proc/stat on 2.6: | |
102 | \fIintr 1462898\fP | |
103 | This line shows counts of interrupts serviced since boot time, | |
104 | for each of the possible system interrupts. | |
105 | The first column is the total of all interrupts serviced | |
106 | including unnumbered architecture specific interrupts; | |
107 | each subsequent column is the total for that particular numbered interrupt. | |
108 | Unnumbered interrupts are not shown, only summed into the total. | |
109 | .TP | |
110 | \fIdisk_io: (2,0):(31,30,5764,1,2) (3,0):\fP... | |
111 | (major,disk_idx):(noinfo, read_io_ops, blks_read, write_io_ops, blks_written) | |
112 | .br | |
113 | (Linux 2.4 only) | |
114 | .TP | |
115 | \fIctxt 115315\fP | |
116 | The number of context switches that the system underwent. | |
117 | .TP | |
118 | \fIbtime 769041601\fP | |
119 | boot time, in seconds since the Epoch, 1970-01-01 00:00:00 +0000 (UTC). | |
120 | .TP | |
121 | \fIprocesses 86031\fP | |
122 | Number of forks since boot. | |
123 | .TP | |
124 | \fIprocs_running 6\fP | |
125 | Number of processes in runnable state. | |
126 | (Linux 2.5.45 onward.) | |
127 | .TP | |
128 | \fIprocs_blocked 2\fP | |
129 | Number of processes blocked waiting for I/O to complete. | |
130 | (Linux 2.5.45 onward.) | |
131 | .TP | |
132 | .I softirq 229245889 94 60001584 13619 5175704 2471304 28 51212741 59130143 0 51240672 | |
133 | .\" commit d3d64df21d3d0de675a0d3ffa7c10514f3644b30 | |
134 | This line shows the number of softirq for all CPUs. | |
135 | The first column is the total of all softirqs and | |
136 | each subsequent column is the total for particular softirq. | |
137 | (Linux 2.6.31 onward.) | |
138 | .RE | |
139 | .SH SEE ALSO | |
140 | .BR proc (5) |