Commit 21d02f8f authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

mm/page_alloc: move free_the_page 

Patch series "Allow high order pages to be stored on PCP", v2.

The per-cpu page allocator (PCP) only handles order-0 pages.  With the
series "Use local_lock for pcp protection and reduce stat overhead" and
"Calculate pcp->high based on zone sizes and active CPUs", it's now
feasible to store high-order pages on PCP lists.

This small series allows PCP to store "cheap" orders where cheap is
determined by PAGE_ALLOC_COSTLY_ORDER and THP-sized allocations.

This patch (of 2):

In the next page, free_compount_page is going to use the common helper
free_the_page.  This patch moves the definition to ease review.  No
functional change.

Link: https://lkml.kernel.org/r/20210603142220.10851-1-mgorman@techsingularity.net
Link: https://lkml.kernel.org/r/20210603142220.10851-2-mgorman@techsingularity.net


Signed-off-by: default avatarMel Gorman <mgorman@techsingularity.net>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f7ec1044

mm/page_alloc.c

+8 −8
Original line number Diff line number Diff line
@@ -687,6 +687,14 @@ static void bad_page(struct page *page, const char *reason) 
	add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE);

}



static inline void free_the_page(struct page *page, unsigned int order)

{

	if (order == 0)		/* Via pcp? */

		free_unref_page(page);

	else

		__free_pages_ok(page, order, FPI_NONE);

}



/*

 * Higher-order pages are called "compound pages".  They are structured thusly:

 *
@@ -5349,14 +5357,6 @@ unsigned long get_zeroed_page(gfp_t gfp_mask) 
}

EXPORT_SYMBOL(get_zeroed_page);



static inline void free_the_page(struct page *page, unsigned int order)

{

	if (order == 0)		/* Via pcp? */

		free_unref_page(page);

	else

		__free_pages_ok(page, order, FPI_NONE);

}



/**

 * __free_pages - Free pages allocated with alloc_pages().

 * @page: The page pointer returned from alloc_pages().