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67439d555f
Since common_callchain has been added to the argument array, we need to
reflect it in perl-based scripts, because otherwise the following args
would be shifted and thus incorrect. E.g. rw-by-pid and calculation of
read and written bytes:
Before:
read counts by pid:
pid comm # reads bytes_requested bytes_read
------ -------------------- ----------- ---------- ----------
19301 dd 4 424510450039736 0
After:
read counts by pid:
pid comm # reads bytes_requested bytes_read
------ -------------------- ----------- ---------- ----------
19301 dd 4 9536 4341
Committer testing:
To see before after first do:
# perf script record rw-by-pid
^C
Now you'll have a perf.data file to report on, then do before and after
using:
# perf script report rw-by-pid
Anbd notice the bytes_request/bytes_read, as above.
Signed-off-by: Michael Petlan <mpetlan@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Benjamin Salon <bsalon@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
LPU-Reference: 20200311132836.12693-1-mpetlan@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
107 lines
2.9 KiB
Perl
107 lines
2.9 KiB
Perl
#!/usr/bin/perl -w
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# SPDX-License-Identifier: GPL-2.0-only
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# (c) 2009, Tom Zanussi <tzanussi@gmail.com>
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# Display r/w activity for files read/written to for a given program
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# The common_* event handler fields are the most useful fields common to
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# all events. They don't necessarily correspond to the 'common_*' fields
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# in the status files. Those fields not available as handler params can
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# be retrieved via script functions of the form get_common_*().
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use 5.010000;
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use strict;
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use warnings;
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use lib "$ENV{'PERF_EXEC_PATH'}/scripts/perl/Perf-Trace-Util/lib";
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use lib "./Perf-Trace-Util/lib";
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use Perf::Trace::Core;
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use Perf::Trace::Util;
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my $usage = "perf script -s rw-by-file.pl <comm>\n";
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my $for_comm = shift or die $usage;
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my %reads;
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my %writes;
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sub syscalls::sys_enter_read
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain, $nr, $fd, $buf, $count) = @_;
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if ($common_comm eq $for_comm) {
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$reads{$fd}{bytes_requested} += $count;
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$reads{$fd}{total_reads}++;
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}
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}
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sub syscalls::sys_enter_write
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain, $nr, $fd, $buf, $count) = @_;
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if ($common_comm eq $for_comm) {
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$writes{$fd}{bytes_written} += $count;
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$writes{$fd}{total_writes}++;
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}
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}
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sub trace_end
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{
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printf("file read counts for $for_comm:\n\n");
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printf("%6s %10s %10s\n", "fd", "# reads", "bytes_requested");
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printf("%6s %10s %10s\n", "------", "----------", "-----------");
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foreach my $fd (sort {$reads{$b}{bytes_requested} <=>
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$reads{$a}{bytes_requested}} keys %reads) {
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my $total_reads = $reads{$fd}{total_reads};
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my $bytes_requested = $reads{$fd}{bytes_requested};
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printf("%6u %10u %10u\n", $fd, $total_reads, $bytes_requested);
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}
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printf("\nfile write counts for $for_comm:\n\n");
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printf("%6s %10s %10s\n", "fd", "# writes", "bytes_written");
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printf("%6s %10s %10s\n", "------", "----------", "-----------");
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foreach my $fd (sort {$writes{$b}{bytes_written} <=>
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$writes{$a}{bytes_written}} keys %writes) {
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my $total_writes = $writes{$fd}{total_writes};
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my $bytes_written = $writes{$fd}{bytes_written};
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printf("%6u %10u %10u\n", $fd, $total_writes, $bytes_written);
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}
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print_unhandled();
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}
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my %unhandled;
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sub print_unhandled
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{
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if ((scalar keys %unhandled) == 0) {
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return;
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}
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print "\nunhandled events:\n\n";
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printf("%-40s %10s\n", "event", "count");
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printf("%-40s %10s\n", "----------------------------------------",
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"-----------");
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foreach my $event_name (keys %unhandled) {
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printf("%-40s %10d\n", $event_name, $unhandled{$event_name});
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}
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}
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sub trace_unhandled
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{
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my ($event_name, $context, $common_cpu, $common_secs, $common_nsecs,
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$common_pid, $common_comm, $common_callchain) = @_;
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$unhandled{$event_name}++;
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}
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