Changes in sysfs-memory-page-offline

ebab9426 - Documentation/ABI: Fix typos

Mon, 14 Aug 2023 21:28:20 +0000

Documentation/ABI: Fix typosFix typos in Documentation/ABI. The changes are in descriptions orcomments where they shouldn't affect use of the ABIs.Signed-off-by: Bjorn Helgaas Reviewed-by: Randy Dunlap Link: https://lore.kernel.org/r/20230814212822.193684-2-helgaas@kernel.orgSigned-off-by: Jonathan Corbet List of files: /linux-6.15/Documentation/ABI/testing/sysfs-memory-page-offline

d0366880 - HWPOISON: offline support: fix spelling in Documentation/ABI/

Mon, 10 Jul 2023 05:22:23 +0000

HWPOISON: offline support: fix spelling in Documentation/ABI/Correct spelling problems as identified by codespell.Link: https://lkml.kernel.org/r/20230710052223.18254-1-rdunlap@infradead.orgFixes: facb6011f399 ("HWPOISON: Add soft page offline support")Signed-off-by: Randy Dunlap Cc: Andi Kleen Cc: Andi Kleen Signed-off-by: Andrew Morton List of files: /linux-6.15/Documentation/ABI/testing/sysfs-memory-page-offline

facb6011 - HWPOISON: Add soft page offline support

Wed, 16 Dec 2009 11:20:00 +0000

HWPOISON: Add soft page offline supportThis is a simpler, gentler variant of memory_failure() for soft pageofflining controlled from user space. It doesn't kill anything, justtries to invalidate and if that doesn't work migrate thepage away.This is useful for predictive failure analysis, where a page hasa high rate of corrected errors, but hasn't gone bad yet. Insteadit can be offlined early and avoided.The offlining is controlled from sysfs, including a new genericentry point for hard page offlining for symmetry too.We use the page isolate facility to prevent re-allocationrace. Normally this is only used by memory hotplug. To avoidraces with memory allocation I am using lock_system_sleep().This avoids the situation where memory hotplug is aboutto isolate a page range and then hwpoison undoes that work.This is a big hammer currently, but the simplest solutioncurrently.When the page is not free or LRU we try to free pagesfrom slab and other caches. The slab freeing is currentlyquite dumb and does not try to focus on the specific slabcache which might own the page. This could be potentiallyimproved later.Thanks to Fengguang Wu and Haicheng Li for some fixes.[Added fix from Andrew Morton to adapt to new migrate_pages prototype]Signed-off-by: Andi Kleen List of files: /linux-6.15/Documentation/ABI/testing/sysfs-memory-page-offline