1 #!/usr/sbin/dtrace -s 2 /* 3 * vmstat.d - vmstat demo in DTrace. 4 * Written using DTrace (Solaris 10 3/05). 5 * 6 * This has been written to demonstrate fetching the same data as vmstat 7 * from DTrace. This program is intended as a starting point for other 8 * DTrace scripts, by beginning with familiar statistics. 9 * 10 * $Id: vmstat.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $ 11 * 12 * USAGE: vmstat.d 13 * 14 * FIELDS: 15 * w swapped out LWPs number 16 * swap virtual memory free Kbytes 17 * free free RAM Kbytes 18 * re page reclaims Kbytes 19 * mf minor faults Kbytes 20 * pi page ins Kbytes 21 * po page outs Kbytes 22 * fr pages freed Kbytes 23 * sr scan rate pages 24 * in interrupts number 25 * sy system calls number 26 * cs context switches number 27 * 28 * NOTES: 29 * Most of the statistics are in units of kilobytes, unlike the 30 * original vmstat command which sometimes uses page counts. 31 * As this program does not use Kstat, there is no summary since boot line. 32 * Free RAM is both free free + cache free. 33 * 34 * SEE ALSO: vmstat(1M) 35 * 36 * COPYRIGHT: Copyright (c) 2005 Brendan Gregg. 37 * 38 * CDDL HEADER START 39 * 40 * The contents of this file are subject to the terms of the 41 * Common Development and Distribution License, Version 1.0 only 42 * (the "License"). You may not use this file except in compliance 43 * with the License. 44 * 45 * You can obtain a copy of the license at Docs/cddl1.txt 46 * or http://www.opensolaris.org/os/licensing. 47 * See the License for the specific language governing permissions 48 * and limitations under the License. 49 * 50 * CDDL HEADER END 51 * 52 * 11-Jun-2005 Brendan Gregg Created this. 53 * 08-Jan-2006 " " Last update. 54 */ 55 56 #pragma D option quiet 57 58 inline int SCREEN = 21; 59 60 /* 61 * Initialise variables 62 */ 63 dtrace:::BEGIN 64 { 65 pi = 0; po = 0; re = 0; sr = 0; mf = 0; fr = 0; 66 sy = 0; in = 0; cs = 0; 67 lines = SCREEN + 1; 68 } 69 70 /* 71 * Print header 72 */ 73 dtrace:::BEGIN, 74 profile:::tick-1sec 75 /lines++ > SCREEN/ 76 { 77 printf(" %1s %10s %8s %5s %5s %4s %4s %4s %4s %5s %6s %4s\n", 78 "w", "swap", "free", "re", "mf", "pi", "po", "fr", "sr", 79 "in", "sy", "cs"); 80 lines = 0; 81 } 82 83 /* 84 * Probe events 85 */ 86 vminfo:::pgpgin { pi += arg0; } 87 vminfo:::pgpgout { po += arg0; } 88 vminfo:::pgrec { re += arg0; } 89 vminfo:::scan { sr += arg0; } 90 vminfo:::as_fault { mf += arg0; } 91 vminfo:::dfree { fr += arg0; } 92 93 syscall:::entry { sy++; } 94 sdt:::interrupt-start { in++; } 95 sched::resume:on-cpu { cs++; } 96 97 /* 98 * Print output line 99 */ 100 profile:::tick-1sec 101 { 102 /* fetch free mem */ 103 this->free = `freemem; 104 105 /* 106 * fetch free swap 107 * 108 * free swap is described in /usr/include/vm/anon.h as, 109 * MAX(ani_max - ani_resv, 0) + (availrmem - swapfs_minfree) 110 */ 111 this->ani_max = `k_anoninfo.ani_max; 112 this->ani_resv = `k_anoninfo.ani_phys_resv + `k_anoninfo.ani_mem_resv; 113 this->swap = (this->ani_max - this->ani_resv > 0 ? 114 this->ani_max - this->ani_resv : 0) + `availrmem - `swapfs_minfree; 115 116 /* fetch w */ 117 this->w = `nswapped; 118 119 /* convert to Kbytes */ 120 pi *= `_pagesize / 1024; 121 po *= `_pagesize / 1024; 122 re *= `_pagesize / 1024; 123 sr *= `_pagesize / 1024; 124 mf *= `_pagesize / 1024; 125 fr *= `_pagesize / 1024; 126 this->swap *= `_pagesize / 1024; 127 this->free *= `_pagesize / 1024; 128 129 /* print line */ 130 printf(" %1d %10d %8d %5d %5d %4d %4d %4d %4d %5d %6d %4d\n", 131 this->w, this->swap, this->free, re, mf, pi, po, fr, sr, 132 in, sy, cs); 133 134 /* clear counters */ 135 pi = 0; po = 0; re = 0; sr = 0; mf = 0; fr = 0; 136 sy = 0; in = 0; cs = 0; 137 } 138