$ fs sysname -debug-pid-sysnames
   orig pid: 13560, last pid: 13662, key: { dentry: ffff96b05cda2e40, mnt: ffff96b048d59860 }
     sysnames list: 'i386_linux26'
   orig pid: 13627, last pid: 13707, key: { dentry: ffff96b05858f6c0, mnt: ffff96b046ddf3a0 }
     sysnames list: 'amd64_linux26'
$