NDCTL−WAIT−SCRUB - Online Linux Manual PageSection : 1
Updated : 02/24/2023
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NAMEndctl-wait-scrub − wait for an Address Range Scrub (ARS) operation to complete
SYNOPSISndctl wait−scrub [<bus−id> <bus−id2> ... <bus−idN>] [<options>]
DESCRIPTIONNVDIMM Address Range Scrub is a capability provided by platform firmware that allows for the discovery of memory errors by system software. It enables system software to pre−emptively avoid accesses that could lead to uncorrectable memory error handling events, and it otherwise allows memory errors to be enumerated. The kernel provides a POLL(2) capable sysfs file (scrub) to indicate the state of ARS. The scrub file maintains a running count of ARS runs that have taken place. While a current run is in progress a + character is emitted along with the current count. The ndctl wait−scrub operation waits for scrub, across all specified buses, to indicate not in−progress at least once.
EXAMPLEWait for scrub on all nvdimm buses in the system. The json listing report at the end only includes the buses that support ARS operations. # ndctl wait−scrub
[
{
"provider":"nfit_test.1",
"dev":"ndbus3",
"scrub_state":"idle"
},
{
"provider":"nfit_test.0",
"dev":"ndbus2",
"scrub_state":"idle"
}
]When specifying an individual bus, or if there is only one bus in the system, the command reports whether ARS support is available. # ndctl wait−scrub e820
error waiting for scrub completion: Operation not supported
OPTIONS−v, −−verbose Emit debug messages for the ARS wait process
COPYRIGHTCopyright © 2016 − 2022, Intel Corporation. License GPLv2: GNU GPL version 2 http://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
SEE ALSOlinkndctl:ndctl−start−scrub[1], ACPI 6.2 Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overview[1]
NOTES 1. ACPI 6.2 Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overview http://www.uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf 0
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