projects/linux·blob master · refs

203 lines · 4.5 KiB

1#!/usr/bin/perl -w
2# SPDX-License-Identifier: GPL-2.0-only
3# (c) 2010, Tom Zanussi <[email protected]>
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}