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diff --git a/lib/IO/Async/OS/linux.pm b/lib/IO/Async/OS/linux.pm
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+#  You may distribute under the terms of either the GNU General Public License
+#  or the Artistic License (the same terms as Perl itself)
+#
+#  (C) Paul Evans, 2014-2015 -- leonerd@leonerd.org.uk
+
+package IO::Async::OS::linux;
+
+use strict;
+use warnings;
+
+our $VERSION = '0.67';
+
+our @ISA = qw( IO::Async::OS::_Base );
+
+=head1 NAME
+
+C<IO::Async::OS::linux> - operating system abstractions on C<Linux> for C<IO::Async>
+
+=head1 DESCRIPTION
+
+This module contains OS support code for C<Linux>.
+
+See instead L<IO::Async::OS>.
+
+=cut
+
+# Suggest either Epoll or Ppoll loops first if they are installed
+use constant LOOP_PREFER_CLASSES => qw( Epoll Ppoll );
+
+# Try to use /proc/pid/fd to get the list of actually-open file descriptors
+# for our process. Saves a bit of time when running with high ulimit -n /
+# fileno counts.
+sub potentially_open_fds
+{
+   my $class = shift;
+
+   opendir my $fd_path, "/proc/$$/fd" or do {
+      warn "Cannot open /proc/$$/fd, falling back to generic method - $!";
+      return $class->SUPER::potentially_open_fds
+   };
+
+   # Skip ., .., our directory handle itself and any other cruft
+   # except fileno() isn't available for the handle so we'll
+   # end up with that in the output anyway. As long as we're
+   # called just before the relevant close() loop, this
+   # should be harmless enough.
+   my @fd = map { m/^([0-9]+)$/ ? $1 : () } readdir $fd_path;
+   closedir $fd_path;
+
+   return @fd;
+}
+
+=head1 AUTHOR
+
+Paul Evans <leonerd@leonerd.org.uk>
+
+=cut
+
+0x55AA;