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#!/usr/bin/perl -w
# (c) 2010, Tom Zanussi <tzanussi@gmail.com>
# Licensed under the terms of the GNU GPL License version 2
# read/write top
#
# Periodically displays system-wide r/w call activity, broken down by
# pid. If an [interval] arg is specified, the display will be
# refreshed every [interval] seconds. The default interval is 3
# seconds.
use 5.010000;
use strict;
use warnings;
use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
use lib "./Perf-Trace-Util/lib";
use Perf::Trace::Core;
use Perf::Trace::Util;
use POSIX qw/SIGALRM SA_RESTART/;
my $default_interval = 3;
my $nlines = 20;
my $print_thread;
my $print_pending = 0;
my %reads;
my %writes;
my $interval = shift;
if (!$interval) {
$interval = $default_interval;
}
sub syscalls::sys_exit_read
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$nr, $ret) = @_;
print_check();
if ($ret > 0) {
$reads{$common_pid}{bytes_read} += $ret;
} else {
if (!defined ($reads{$common_pid}{bytes_read})) {
$reads{$common_pid}{bytes_read} = 0;
}
$reads{$common_pid}{errors}{$ret}++;
}
}
sub syscalls::sys_enter_read
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$nr, $fd, $buf, $count) = @_;
print_check();
$reads{$common_pid}{bytes_requested} += $count;
$reads{$common_pid}{total_reads}++;
$reads{$common_pid}{comm} = $common_comm;
}
sub syscalls::sys_exit_write
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$nr, $ret) = @_;
print_check();
if ($ret <= 0) {
$writes{$common_pid}{errors}{$ret}++;
}
}
sub syscalls::sys_enter_write
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm,
$nr, $fd, $buf, $count) = @_;
print_check();
$writes{$common_pid}{bytes_written} += $count;
$writes{$common_pid}{total_writes}++;
$writes{$common_pid}{comm} = $common_comm;
}
sub trace_begin
{
my $sa = POSIX::SigAction->new(\&set_print_pending);
$sa->flags(SA_RESTART);
$sa->safe(1);
POSIX::sigaction(SIGALRM, $sa) or die "Can't set SIGALRM handler: $!\n";
alarm 1;
}
sub trace_end
{
print_unhandled();
print_totals();
}
sub print_check()
{
if ($print_pending == 1) {
$print_pending = 0;
print_totals();
}
}
sub set_print_pending()
{
$print_pending = 1;
alarm $interval;
}
sub print_totals
{
my $count;
$count = 0;
clear_term();
printf("\nread counts by pid:\n\n");
printf("%6s %20s %10s %10s %10s\n", "pid", "comm",
"# reads", "bytes_req", "bytes_read");
printf("%6s %-20s %10s %10s %10s\n", "------", "--------------------",
"----------", "----------", "----------");
foreach my $pid (sort { ($reads{$b}{bytes_read} || 0) <=>
($reads{$a}{bytes_read} || 0) } keys %reads) {
my $comm = $reads{$pid}{comm} || "";
my $total_reads = $reads{$pid}{total_reads} || 0;
my $bytes_requested = $reads{$pid}{bytes_requested} || 0;
my $bytes_read = $reads{$pid}{bytes_read} || 0;
printf("%6s %-20s %10s %10s %10s\n", $pid, $comm,
$total_reads, $bytes_requested, $bytes_read);
if (++$count == $nlines) {
last;
}
}
$count = 0;
printf("\nwrite counts by pid:\n\n");
printf("%6s %20s %10s %13s\n", "pid", "comm",
"# writes", "bytes_written");
printf("%6s %-20s %10s %13s\n", "------", "--------------------",
"----------", "-------------");
foreach my $pid (sort { ($writes{$b}{bytes_written} || 0) <=>
($writes{$a}{bytes_written} || 0)} keys %writes) {
my $comm = $writes{$pid}{comm} || "";
my $total_writes = $writes{$pid}{total_writes} || 0;
my $bytes_written = $writes{$pid}{bytes_written} || 0;
printf("%6s %-20s %10s %13s\n", $pid, $comm,
$total_writes, $bytes_written);
if (++$count == $nlines) {
last;
}
}
%reads = ();
%writes = ();
}
my %unhandled;
sub print_unhandled
{
if ((scalar keys %unhandled) == 0) {
return;
}
print "\nunhandled events:\n\n";
printf("%-40s %10s\n", "event", "count");
printf("%-40s %10s\n", "----------------------------------------",
"-----------");
foreach my $event_name (keys %unhandled) {
printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
}
}
sub trace_unhandled
{
my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
$common_pid, $common_comm) = @_;
$unhandled{$event_name}++;
}