mm/memblock: introduce a new helper memblock_estimated_nr_free_pages()

During bootup, system may need the number of free pages in the whole system
to do some calculation before all pages are freed to buddy system. Usually
this number is get from totalram_pages(). Since we plan to move the free
pages accounting in __free_pages_core(), this value may not represent
total free pages at the early stage, especially when
CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled.

Instead of using raw memblock api, let's introduce a new helper for user
to get the estimated number of free pages from memblock point of view.

Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
CC: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20240808001415.6298-1-richard.weiyang@gmail.com
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>

This commit is contained in:

Wei Yang

2024-08-08 00:14:13 +00:00

committed by

Mike Rapoport (Microsoft)

parent 9e3d665384

commit d0f8a8973f

3 changed files with 19 additions and 0 deletions

									
										tools/include/linux/pfn.h
									
		+1
		
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				@@ -7,4 +7,5 @@

				#define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)

				#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)

				#define PFN_PHYS(x)	((phys_addr_t)(x) << PAGE_SHIFT)

				#define PHYS_PFN(x)	((unsigned long)((x) >> PAGE_SHIFT))

				#endif