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powerpc/pseries/cmm: Implement balloon compaction

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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
This commit is contained in:
David Hildenbrand
2019-10-31 15:29:29 +01:00
committed by Michael Ellerman
parent 1ef2f06b71
commit fe030c9b85
3 changed files with 121 additions and 14 deletions
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include/uapi/linux/magic.h
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@@ -94,5 +94,6 @@
#define ZSMALLOC_MAGIC 0x58295829
#define DMA_BUF_MAGIC 0x444d4142 /* "DMAB" */
#define Z3FOLD_MAGIC 0x33
#define PPC_CMM_MAGIC 0xc7571590
#endif /* __LINUX_MAGIC_H__ */