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| author | Michael Ellerman <mpe@ellerman.id.au> | 2021-05-08 21:12:55 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-05-08 21:12:55 +1000 |
| commit | f96271cefe6dfd1cb04195b76f4a33e185cd7f92 (patch) | |
| tree | f290b3e7aa9c12fdc4853ce97c150c4f9abd90a3 /Documentation/admin-guide/mm/memory-hotplug.rst | |
| parent | 32b48bf8514c28cdc89cd8069eceeb6e6cff0612 (diff) | |
| parent | dd860052c99b1e088352bdd4fb7aef46f8d2ef47 (diff) | |
| download | linux-f96271cefe6dfd1cb04195b76f4a33e185cd7f92.tar.bz2 | |
Merge branch 'master' into next
Merge master back into next, this allows us to resolve some conflicts in
arch/powerpc/Kconfig, and also re-sort the symbols under config PPC so
that they are in alphabetical order again.
Diffstat (limited to 'Documentation/admin-guide/mm/memory-hotplug.rst')
| -rw-r--r-- | Documentation/admin-guide/mm/memory-hotplug.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/admin-guide/mm/memory-hotplug.rst b/Documentation/admin-guide/mm/memory-hotplug.rst index 5307f90738aa..05d51d2d8beb 100644 --- a/Documentation/admin-guide/mm/memory-hotplug.rst +++ b/Documentation/admin-guide/mm/memory-hotplug.rst @@ -357,6 +357,15 @@ creates ZONE_MOVABLE as following. Unfortunately, there is no information to show which memory block belongs to ZONE_MOVABLE. This is TBD. +.. note:: + Techniques that rely on long-term pinnings of memory (especially, RDMA and + vfio) are fundamentally problematic with ZONE_MOVABLE and, therefore, memory + hot remove. Pinned pages cannot reside on ZONE_MOVABLE, to guarantee that + memory can still get hot removed - be aware that pinning can fail even if + there is plenty of free memory in ZONE_MOVABLE. In addition, using + ZONE_MOVABLE might make page pinning more expensive, because pages have to be + migrated off that zone first. + .. _memory_hotplug_how_to_offline_memory: How to offline memory |