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#!/usr/sbin/dtrace -s
/*
* dnlcps.d - DNLC stats by process.
* Written in DTrace (Solaris 10 3/05).
*
* The DNLC is the Directory Name Lookup Cache. Filename lookups often
* return a hit from here, before needing to traverse the regular file
* system cache or go to disk.
*
* dnlcps.d prints DNLC statistics by process.
*
* $Id: dnlcps.d 3 2007-08-01 10:50:08Z brendan $
*
* USAGE: dnlcps.d # wait several seconds, then hit Ctrl-C
*
* FIELDS:
* PID Process ID
* CMD Command name
* value 0 == miss, 1 == hit
* count number of occurrences
*
* COPYRIGHT: Copyright (c) 2006 Brendan Gregg.
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at Docs/cddl1.txt
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* CDDL HEADER END
*
* 27-Mar-2004 Brendan Gregg Created this.
* 14-Jun-2005 " " Rewrote this a lot.
* 18-Feb-2006 " " Last update.
*/
#pragma D option quiet
/*
* Print header
*/
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
}
/*
* DNLC return
*/
fbt:genunix:dnlc_lookup:return
{
this->code = arg1 == 0 ? 0 : 1;
@Result[execname, pid] = lquantize(this->code, 0, 1, 1);
}
/*
* Print report
*/
dtrace:::END
{
printa(" CMD: %-16s PID: %d\n%@d\n", @Result);
}
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