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ANDROID: implement wrapper for reverse migration

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Reverse migration is used to do the balancing the occupancy of memory
zones in a node in the system whose imabalance may be caused by
migration of pages to other zones by an operation, eg: hotremove and
then hotadding the same memory. In this case there is a lot of free
memory in newly hotadd memory which can be filled up by the previous
migrated pages(as part of offline/hotremove) thus may free up some
pressure in other zones of the node.

Upstream discussion: https://lore.kernel.org/patchwork/cover/1382106/

Change-Id: Ib3137dab0db66ecf6858c4077dcadb9dfd0c6b1c
Bug: 175403896
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
This commit is contained in:
Charan Teja Reddy
2021-02-16 13:59:45 +05:30
committed by Suren Baghdasaryan
parent ea527a52d1
commit 8cd9aa93b7
5 changed files with 52 additions and 0 deletions
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8
include/linux/compaction.h
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@@ -182,6 +182,8 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order,
extern int kcompactd_run(int nid);
extern void kcompactd_stop(int nid);
extern void wakeup_kcompactd(pg_data_t *pgdat, int order, int highest_zoneidx);
extern unsigned long isolate_and_split_free_page(struct page *page,
struct list_head *list);
#else
static inline void reset_isolation_suitable(pg_data_t *pgdat)
@@ -236,6 +238,12 @@ static inline void wakeup_kcompactd(pg_data_t *pgdat,
{
}
static unsigned long isolate_and_split_free_page(struct page *page,
struct list_head *list)
{
return 0;
}
#endif /* CONFIG_COMPACTION */
struct node;