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

Source file repositories/reference/linux-study-clean/tools/perf/scripts/perl/rw-by-pid.pl

File Facts

System
Linux kernel
Corpus path
tools/perf/scripts/perl/rw-by-pid.pl
Extension
.pl
Size
5281 bytes
Lines
185
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

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, $common_callchain,
	$nr, $fd, $buf, $count) = @_;

    $reads{$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, $common_callchain,
	$nr, $ret) = @_;

    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, $common_callchain,
	$nr, $fd, $buf, $count) = @_;

    $writes{$common_pid}{bytes_written} += $count;
    $writes{$common_pid}{total_writes}++;
    $writes{$common_pid}{comm} = $common_comm;
}

sub trace_end
{
    printf("read counts by pid:\n\n");

    printf("%6s  %20s  %10s  %10s  %10s\n", "pid", "comm",
	   "# reads", "bytes_requested", "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);
    }

    printf("\nfailed reads by pid:\n\n");

    printf("%6s  %20s  %6s  %10s\n", "pid", "comm", "error #", "# errors");
    printf("%6s  %20s  %6s  %10s\n", "------", "--------------------",
	   "------", "----------");

    my @errcounts = ();

Annotation

Implementation Notes