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