|Page list used to submit IO when memory is in pressure. |
|sub-io's shared by all threads accessing this device when memory is too low to allocate sub-io's dynamically. |
|Environments used by sub-io's in lov_device_emerg::emrg_subio. |
|Refchecks for lov_device_emerg::emrg_env. |
They are preallocated in sufficient quantities in lov_device::ld_emerg, and access to them is serialized lov_device::ld_mutex.