tree eb37fdad2bb18aed40413f1da902d510220cd4d6
parent 1ef2f06b71792c2efaa4fb4aef8f1fc2a115ee1f
author David Hildenbrand <david@redhat.com> 1572532169 +0100
committer Michael Ellerman <mpe@ellerman.id.au> 1573624681 +1100

powerpc/pseries/cmm: Implement balloon compaction

We can now get rid of the cmm_lock and completely rely on the balloon
compaction internals, which now also manage the page list and the
lock.

Inflated/"loaned" pages are now movable. Memory blocks that contain
such pages can get offlined. Also, all such pages will be marked
PageOffline() and can therefore be excluded in memory dumps using
recent versions of makedumpfile.

Don't switch to balloon_page_alloc() yet (due to the GFP_NOIO). Will
do that separately to discuss this change in detail.

Signed-off-by: David Hildenbrand <david@redhat.com>
[mpe: Add isolated_pages-- in cmm_migratepage() as suggested by David]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191031142933.10779-9-david@redhat.com