tools/perf/scripts/perl/rw-by-file.pl

   1 #!/usr/bin/perl -w
   2 # (c) 2009, Tom Zanussi <tzanussi@gmail.com>
   3 # Licensed under the terms of the GNU GPL License version 2
   4
   5 # Display r/w activity for files read/written to for a given program
   6
   7 # The common_* event handler fields are the most useful fields common to
   8 # all events.  They don't necessarily correspond to the 'common_*' fields
   9 # in the status files.  Those fields not available as handler params can
  10 # be retrieved via script functions of the form get_common_*().
  11
  12 use 5.010000;
  13 use strict;
  14 use warnings;
  15
  16 use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
  17 use lib "./Perf-Trace-Util/lib";
  18 use Perf::Trace::Core;
  19 use Perf::Trace::Util;
  20
  21 my $usage = "perf trace -s rw-by-file.pl <comm>\n";
  22
  23 my $for_comm = shift or die $usage;
  24
  25 my %reads;
  26 my %writes;
  27
  28 sub syscalls::sys_enter_read
  29 {
  30     my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
  31         $common_pid, $common_comm, $nr, $fd, $buf, $count) = @_;
  32
  33     if ($common_comm eq $for_comm) {
  34         $reads{$fd}{bytes_requested} += $count;
  35         $reads{$fd}{total_reads}++;
  36     }
  37 }
  38
  39 sub syscalls::sys_enter_write
  40 {
  41     my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
  42         $common_pid, $common_comm, $nr, $fd, $buf, $count) = @_;
  43
  44     if ($common_comm eq $for_comm) {
  45         $writes{$fd}{bytes_written} += $count;
  46         $writes{$fd}{total_writes}++;
  47     }
  48 }
  49
  50 sub trace_end
  51 {
  52     printf("file read counts for $for_comm:\n\n");
  53
  54     printf("%6s  %10s  %10s\n", "fd", "# reads", "bytes_requested");
  55     printf("%6s  %10s  %10s\n", "------", "----------", "-----------");
  56
  57     foreach my $fd (sort {$reads{$b}{bytes_requested} <=>
  58                               $reads{$a}{bytes_requested}} keys %reads) {
  59         my $total_reads = $reads{$fd}{total_reads};
  60         my $bytes_requested = $reads{$fd}{bytes_requested};
  61         printf("%6u  %10u  %10u\n", $fd, $total_reads, $bytes_requested);
  62     }
  63
  64     printf("\nfile write counts for $for_comm:\n\n");
  65
  66     printf("%6s  %10s  %10s\n", "fd", "# writes", "bytes_written");
  67     printf("%6s  %10s  %10s\n", "------", "----------", "-----------");
  68
  69     foreach my $fd (sort {$writes{$b}{bytes_written} <=>
  70                               $writes{$a}{bytes_written}} keys %writes) {
  71         my $total_writes = $writes{$fd}{total_writes};
  72         my $bytes_written = $writes{$fd}{bytes_written};
  73         printf("%6u  %10u  %10u\n", $fd, $total_writes, $bytes_written);
  74     }
  75
  76     print_unhandled();
  77 }
  78
  79 my %unhandled;
  80
  81 sub print_unhandled
  82 {
  83     if ((scalar keys %unhandled) == 0) {
  84         return;
  85     }
  86
  87     print "\nunhandled events:\n\n";
  88
  89     printf("%-40s  %10s\n", "event", "count");
  90     printf("%-40s  %10s\n", "----------------------------------------",
  91            "-----------");
  92
  93     foreach my $event_name (keys %unhandled) {
  94         printf("%-40s  %10d\n", $event_name, $unhandled{$event_name});
  95     }
  96 }
  97
  98 sub trace_unhandled
  99 {
 100     my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
 101         $common_pid, $common_comm) = @_;
 102
 103     $unhandled{$event_name}++;
 104 }
 105
 106