mm/memcg: Add folio_memcg() and related functions

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memcg information is only stored in the head page, so the memcg
subsystem needs to assure that all accesses are to the head page.
The first step is converting page_memcg() to folio_memcg().

The callers of page_memcg() and PageMemcgKmem() are not yet ready to be
converted to use folios, so retain them as wrappers around folio_memcg()
and folio_memcg_kmem().  They will be converted in a later patch set.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>

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Matthew Wilcox (Oracle) 2021-06-28 14:59:26 -04:00

parent 8e88bd2dfd

commit 1b7e4464d4

2 changed files with 77 additions and 54 deletions

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110

include/linux/memcontrol.h

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21

mm/memcontrol.c

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