1N/A#!/usr/sbin/dtrace -s
1N/A/*
1N/A * dnlcsnoop.d - snoop DNLC activity.
1N/A * Written in DTrace (Solaris 10 3/05).
1N/A *
1N/A * The DNLC is the Directory Name Lookup Cache. Filename lookups often
1N/A * return a hit from here, before needing to traverse the regular file
1N/A * system cache or go to disk.
1N/A *
1N/A * $Id: dnlcsnoop.d 3 2007-08-01 10:50:08Z brendan $
1N/A *
1N/A * USAGE: dnlcsnoop.d # wait several seconds, then hit Ctrl-C
1N/A *
1N/A * FIELDS:
1N/A * PID Process ID
1N/A * CMD Command name
1N/A * TIME Elapsed time for lookup, us
1N/A * HIT DNLC hit Y/N
1N/A * PATH Path for DNLC lookup
1N/A *
1N/A * COPYRIGHT: Copyright (c) 2005, 2006 Brendan Gregg.
1N/A *
1N/A * CDDL HEADER START
1N/A *
1N/A * The contents of this file are subject to the terms of the
1N/A * Common Development and Distribution License, Version 1.0 only
1N/A * (the "License"). You may not use this file except in compliance
1N/A * with the License.
1N/A *
1N/A * You can obtain a copy of the license at Docs/cddl1.txt
1N/A * or http://www.opensolaris.org/os/licensing.
1N/A * See the License for the specific language governing permissions
1N/A * and limitations under the License.
1N/A *
1N/A * CDDL HEADER END
1N/A *
1N/A * 27-Mar-2004 Brendan Gregg Created this.
1N/A * 14-Jun-2005 " " Rewrote this a lot.
1N/A * 20-Apr-2006 " " Last update.
1N/A */
1N/A
1N/A#pragma D option quiet
1N/A
1N/A/*
1N/A * Print header
1N/A */
1N/Adtrace:::BEGIN
1N/A{
1N/A printf("%6s %-12s %5s %3s %s\n",
1N/A "PID", "CMD", "TIME", "HIT", "PATH");
1N/A}
1N/A
1N/A/*
1N/A * DNLC lookup
1N/A */
1N/Afbt:genunix:dnlc_lookup:entry
1N/A{
1N/A /* store path */
1N/A self->path = stringof(args[0]->v_path);
1N/A
1N/A /* check for trailing "/" */
1N/A this->len = strlen(self->path);
1N/A self->join = *(char *)(args[0]->v_path + this->len - 1) == '/' ?
1N/A "" : "/";
1N/A
1N/A /* store lookup name */
1N/A self->name = stringof(arg1);
1N/A
1N/A /* store start time */
1N/A self->start = timestamp;
1N/A}
1N/A
1N/A/*
1N/A * DNLC return
1N/A */
1N/Afbt:genunix:dnlc_lookup:return
1N/A/self->start/
1N/A{
1N/A /* calculate elapsed time */
1N/A this->elapsed = (timestamp - self->start) / 1000;
1N/A
1N/A /* print output */
1N/A printf("%6d %-12.12s %5d %3s %s%s%s\n",
1N/A pid, execname, this->elapsed, arg1 == 0 ? "N" : "Y",
1N/A self->path, self->join, self->name);
1N/A
1N/A /* clear variables */
1N/A self->path = 0;
1N/A self->join = 0;
1N/A self->name = 0;
1N/A self->start = 0;
1N/A}