mm: handle multiple owners of device private pages in migrate_vma

Add a new src_owner field to struct migrate_vma. If the field is set, only device private pages with page->pgmap->owner equal to that field are migrated. If the field is not set only "normal" pages are migrated.

Christoph Hellwig committed 6 years ago

Commit 800bb1c1 parent f894ddd4 files · +16 −3Browse files

Showing the changes to include/linux (1 of 4 files). Show all

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include/linux/migrate.h+8−0

@@ -196,6 +196,14 @@ struct migrate_vma { · 195 unmodified lines
196	196	unsigned long npages;
197	197	unsigned long start;
198	198	unsigned long end;
	199	+
	200	+ /*
	201	+ * Set to the owner value also stored in page->pgmap->owner for
	202	+ * migrating out of device private memory. If set only device
	203	+ * private pages with this owner are migrated. If not set
	204	+ * device private pages are not migrated at all.
	205	+ */
	206	+ void *src_owner;
199	207	};
200	208
201	209	int migrate_vma_setup(struct migrate_vma *args);