126 lines
3.1 KiB
Perl
Executable File
126 lines
3.1 KiB
Perl
Executable File
#!/usr/bin/perl -w
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#
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# hotkernel - sample on-CPU kernel-level functions and modules.
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# Written using Perl and DTrace (Solaris 10 03/05)
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#
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# This samples the on-CPU function at 1001 Hertz, for a simple yet
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# effective kernel-level profiling tool for sampling exclusive function time.
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# The output will identify which function is on the CPU the most - which is
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# the hottest. See Notes/ALLexclusive_notes.txt for an explanation of
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# exclusive time.
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#
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# $Id: hotkernel 65 2007-10-04 11:09:40Z brendan $
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#
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# USAGE: hotkernel [-hm]
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#
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# -h # help
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# -m # match modules, not functions
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# eg,
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# hotkernel # sample kernel functions
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# hotkernel -m # sample kernel modules
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#
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# FIELDS:
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# FUNCTION Function name
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# MODULE Module name
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# COUNT Number of samples
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# PCNT Percentage of total samples
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#
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# COPYRIGHT: Copyright (c) 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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# Author: Brendan Gregg [Sydney, Australia]
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#
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# 29-Jun-2006 Brendan Gregg Created this.
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# 29-Jun-2006 " " Last update.
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#
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use strict;
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use Getopt::Std;
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#
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# Command Line Arguments
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#
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my $args;
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usage() if defined $ARGV[0] and $ARGV[0] eq "--help";
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getopts('hm') or usage();
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usage() if defined $main::opt_h and $main::opt_h;
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my $mods = defined $main::opt_m and $main::opt_m ? 1 : 0;
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#
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# Cleanup on signals
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#
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$SIG{INT} = \&cleanupsig; # Ctrl-C
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$SIG{QUIT} = \&cleanupsig; # Ctrl-\
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$SIG{TERM} = \&cleanupsig; # TERM
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#
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# Declare DTrace script
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#
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my $dtrace = <<END;
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/usr/sbin/dtrace -n '
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#pragma D option quiet
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profile:::profile-1001hz
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/arg0/
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{
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\@pc[arg0] = count();
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}
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dtrace:::END
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{
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printa("%a %\@d\\n", \@pc);
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}
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'
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END
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#
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# Run DTrace, process output
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#
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my %Count;
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my $total;
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open DTRACE, "$dtrace |" or die "ERROR1: Can't run dtrace (perms?): $!\n";
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print "Sampling... Hit Ctrl-C to end.\n";
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while (my $line = <DTRACE>) {
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next if $line =~ /^\s*$/;
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my ($addr, $count) = split ' ', $line;
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my ($name, $offset) = split /\+/, $addr;
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next if $name eq "0x0";
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$name =~ s/\`.*// if $mods;
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$Count{$name} += $count;
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$total += $count;
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}
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close DTRACE;
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#
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# Print final report
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#
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printf "\n%-52s %8s %6s\n", $mods ? "MODULE" : "FUNCTION", "COUNT", "PCNT";
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foreach my $name (sort { $Count{$a} <=> $Count{$b} } keys %Count) {
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printf "%-52s %8d %5.1f%%\n", $name, $Count{$name},
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100 * $Count{$name} / ($total ? $total : 1);
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}
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#
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# Subroutines
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#
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sub cleanupsig {
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}
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sub usage {
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print STDERR "USAGE: hotkernel [-hm]\n";
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print STDERR " eg,\n";
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print STDERR " hotkernel # sample kernel functions\n";
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print STDERR " hotkernel -m # sample kernel modules\n";
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exit 1;
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}
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