xref: /openbmc/linux/tools/perf/scripts/perl/rwtop.pl (revision 3cf3cdea) 
1#!/usr/bin/perl -w
2# SPDX-License-Identifier: GPL-2.0-only
3# (c) 2010, Tom Zanussi <tzanussi@gmail.com>
4
5# read/write top
6#
7# Periodically displays system-wide r/w call activity, broken down by
8# pid.  If an [interval] arg is specified, the display will be
9# refreshed every [interval] seconds.  The default interval is 3
10# seconds.
11
12use 5.010000;
13use strict;
14use warnings;
15
16use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
17use lib "./Perf-Trace-Util/lib";
18use Perf::Trace::Core;
19use Perf::Trace::Util;
20use POSIX qw/SIGALRM SA_RESTART/;
21
22my $default_interval = 3;
23my $nlines = 20;
24my $print_thread;
25my $print_pending = 0;
26
27my %reads;
28my %writes;
29
30my $interval = shift;
31if (!$interval) {
32    $interval = $default_interval;
33}
34
35sub syscalls::sys_exit_read
36{
37    my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
38	$common_pid, $common_comm, $common_callchain,
39	$nr, $ret) = @_;
40
41    print_check();
42
43    if ($ret > 0) {
44	$reads{$common_pid}{bytes_read} += $ret;
45    } else {
46	if (!defined ($reads{$common_pid}{bytes_read})) {
47	    $reads{$common_pid}{bytes_read} = 0;
48	}
49	$reads{$common_pid}{errors}{$ret}++;
50    }
51}
52
53sub syscalls::sys_enter_read
54{
55    my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
56	$common_pid, $common_comm, $common_callchain,
57	$nr, $fd, $buf, $count) = @_;
58
59    print_check();
60
61    $reads{$common_pid}{bytes_requested} += $count;
62    $reads{$common_pid}{total_reads}++;
63    $reads{$common_pid}{comm} = $common_comm;
64}
65
66sub syscalls::sys_exit_write
67{
68    my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
69	$common_pid, $common_comm, $common_callchain,
70	$nr, $ret) = @_;
71
72    print_check();
73
74    if ($ret <= 0) {
75	$writes{$common_pid}{errors}{$ret}++;
76    }
77}
78
79sub syscalls::sys_enter_write
80{
81    my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
82	$common_pid, $common_comm, $common_callchain,
83	$nr, $fd, $buf, $count) = @_;
84
85    print_check();
86
87    $writes{$common_pid}{bytes_written} += $count;
88    $writes{$common_pid}{total_writes}++;
89    $writes{$common_pid}{comm} = $common_comm;
90}
91
92sub trace_begin
93{
94    my $sa = POSIX::SigAction->new(\&set_print_pending);
95    $sa->flags(SA_RESTART);
96    $sa->safe(1);
97    POSIX::sigaction(SIGALRM, $sa) or die "Can't set SIGALRM handler: $!\n";
98    alarm 1;
99}
100
101sub trace_end
102{
103    print_unhandled();
104    print_totals();
105}
106
107sub print_check()
108{
109    if ($print_pending == 1) {
110	$print_pending = 0;
111	print_totals();
112    }
113}
114
115sub set_print_pending()
116{
117    $print_pending = 1;
118    alarm $interval;
119}
120
121sub print_totals
122{
123    my $count;
124
125    $count = 0;
126
127    clear_term();
128
129    printf("\nread counts by pid:\n\n");
130
131    printf("%6s  %20s  %10s  %10s  %10s\n", "pid", "comm",
132	   "# reads", "bytes_req", "bytes_read");
133    printf("%6s  %-20s  %10s  %10s  %10s\n", "------", "--------------------",
134	   "----------", "----------", "----------");
135
136    foreach my $pid (sort { ($reads{$b}{bytes_read} || 0) <=>
137			       ($reads{$a}{bytes_read} || 0) } keys %reads) {
138	my $comm = $reads{$pid}{comm} || "";
139	my $total_reads = $reads{$pid}{total_reads} || 0;
140	my $bytes_requested = $reads{$pid}{bytes_requested} || 0;
141	my $bytes_read = $reads{$pid}{bytes_read} || 0;
142
143	printf("%6s  %-20s  %10s  %10s  %10s\n", $pid, $comm,
144	       $total_reads, $bytes_requested, $bytes_read);
145
146	if (++$count == $nlines) {
147	    last;
148	}
149    }
150
151    $count = 0;
152
153    printf("\nwrite counts by pid:\n\n");
154
155    printf("%6s  %20s  %10s  %13s\n", "pid", "comm",
156	   "# writes", "bytes_written");
157    printf("%6s  %-20s  %10s  %13s\n", "------", "--------------------",
158	   "----------", "-------------");
159
160    foreach my $pid (sort { ($writes{$b}{bytes_written} || 0) <=>
161			($writes{$a}{bytes_written} || 0)} keys %writes) {
162	my $comm = $writes{$pid}{comm} || "";
163	my $total_writes = $writes{$pid}{total_writes} || 0;
164	my $bytes_written = $writes{$pid}{bytes_written} || 0;
165
166	printf("%6s  %-20s  %10s  %13s\n", $pid, $comm,
167	       $total_writes, $bytes_written);
168
169	if (++$count == $nlines) {
170	    last;
171	}
172    }
173
174    %reads = ();
175    %writes = ();
176}
177
178my %unhandled;
179
180sub print_unhandled
181{
182    if ((scalar keys %unhandled) == 0) {
183	return;
184    }
185
186    print "\nunhandled events:\n\n";
187
188    printf("%-40s  %10s\n", "event", "count");
189    printf("%-40s  %10s\n", "----------------------------------------",
190	   "-----------");
191
192    foreach my $event_name (keys %unhandled) {
193	printf("%-40s  %10d\n", $event_name, $unhandled{$event_name});
194    }
195}
196
197sub trace_unhandled
198{
199    my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
200	$common_pid, $common_comm, $common_callchain) = @_;
201
202    $unhandled{$event_name}++;
203}
204