1235368Sgnn#!/usr/sbin/dtrace -s 2235368Sgnn/* 3235368Sgnn * dnlcsnoop.d - snoop DNLC activity. 4235368Sgnn * Written in DTrace (Solaris 10 3/05). 5235368Sgnn * 6235368Sgnn * The DNLC is the Directory Name Lookup Cache. Filename lookups often 7235368Sgnn * return a hit from here, before needing to traverse the regular file 8235368Sgnn * system cache or go to disk. 9235368Sgnn * 10235368Sgnn * $Id: dnlcsnoop.d 3 2007-08-01 10:50:08Z brendan $ 11235368Sgnn * 12235368Sgnn * USAGE: dnlcsnoop.d # wait several seconds, then hit Ctrl-C 13235368Sgnn * 14235368Sgnn * FIELDS: 15235368Sgnn * PID Process ID 16235368Sgnn * CMD Command name 17235368Sgnn * TIME Elapsed time for lookup, us 18235368Sgnn * HIT DNLC hit Y/N 19235368Sgnn * PATH Path for DNLC lookup 20235368Sgnn * 21235368Sgnn * COPYRIGHT: Copyright (c) 2005, 2006 Brendan Gregg. 22235368Sgnn * 23235368Sgnn * CDDL HEADER START 24235368Sgnn * 25235368Sgnn * The contents of this file are subject to the terms of the 26235368Sgnn * Common Development and Distribution License, Version 1.0 only 27235368Sgnn * (the "License"). You may not use this file except in compliance 28235368Sgnn * with the License. 29235368Sgnn * 30235368Sgnn * You can obtain a copy of the license at Docs/cddl1.txt 31235368Sgnn * or http://www.opensolaris.org/os/licensing. 32235368Sgnn * See the License for the specific language governing permissions 33235368Sgnn * and limitations under the License. 34235368Sgnn * 35235368Sgnn * CDDL HEADER END 36235368Sgnn * 37235368Sgnn * 27-Mar-2004 Brendan Gregg Created this. 38235368Sgnn * 14-Jun-2005 " " Rewrote this a lot. 39235368Sgnn * 20-Apr-2006 " " Last update. 40235368Sgnn */ 41235368Sgnn 42235368Sgnn#pragma D option quiet 43235368Sgnn 44235368Sgnn/* 45235368Sgnn * Print header 46235368Sgnn */ 47235368Sgnndtrace:::BEGIN 48235368Sgnn{ 49235368Sgnn printf("%6s %-12s %5s %3s %s\n", 50235368Sgnn "PID", "CMD", "TIME", "HIT", "PATH"); 51235368Sgnn} 52235368Sgnn 53235368Sgnn/* 54235368Sgnn * DNLC lookup 55235368Sgnn */ 56235368Sgnnfbt:genunix:dnlc_lookup:entry 57235368Sgnn{ 58235368Sgnn /* store path */ 59235368Sgnn self->path = stringof(args[0]->v_path); 60235368Sgnn 61235368Sgnn /* check for trailing "/" */ 62235368Sgnn this->len = strlen(self->path); 63235368Sgnn self->join = *(char *)(args[0]->v_path + this->len - 1) == '/' ? 64235368Sgnn "" : "/"; 65235368Sgnn 66235368Sgnn /* store lookup name */ 67235368Sgnn self->name = stringof(arg1); 68235368Sgnn 69235368Sgnn /* store start time */ 70235368Sgnn self->start = timestamp; 71235368Sgnn} 72235368Sgnn 73235368Sgnn/* 74235368Sgnn * DNLC return 75235368Sgnn */ 76235368Sgnnfbt:genunix:dnlc_lookup:return 77235368Sgnn/self->start/ 78235368Sgnn{ 79235368Sgnn /* calculate elapsed time */ 80235368Sgnn this->elapsed = (timestamp - self->start) / 1000; 81235368Sgnn 82235368Sgnn /* print output */ 83235368Sgnn printf("%6d %-12.12s %5d %3s %s%s%s\n", 84235368Sgnn pid, execname, this->elapsed, arg1 == 0 ? "N" : "Y", 85235368Sgnn self->path, self->join, self->name); 86235368Sgnn 87235368Sgnn /* clear variables */ 88235368Sgnn self->path = 0; 89235368Sgnn self->join = 0; 90235368Sgnn self->name = 0; 91235368Sgnn self->start = 0; 92235368Sgnn} 93