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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/all/ee78c83d-da9b-f6d1-4f66-934b7782acfb@codeaurora.org/

Change-Id: Ib3137dab0db66ecf6858c4077dcadb9dfd0c6b1c
Bug: 201263307
Signed-off-by: Charan Teja Reddy <quic_charante@quicinc.com>
This commit is contained in:
Charan Teja Reddy
2021-02-16 13:59:45 +05:30
committed by Suren Baghdasaryan
parent c34dfc24e0
commit f47b852faa
5 changed files with 52 additions and 0 deletions
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include/linux/mmzone.h
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@@ -1096,6 +1096,7 @@ static inline struct pglist_data *NODE_DATA(int nid)
extern struct pglist_data *first_online_pgdat(void);
extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
extern struct zone *next_zone(struct zone *zone);
extern int isolate_anon_lru_page(struct page *page);
/**
* for_each_online_pgdat - helper macro to iterate over all online nodes