mm/page_alloc: make deferred page init free pages in MAX_ORDER blocks

Normal page init path frees pages during the boot in MAX_ORDER chunks, but
deferred page init path does it in pageblock blocks.

Change deferred page init path to work in MAX_ORDER blocks.

For cases when MAX_ORDER is larger than pageblock, set migrate type to
MIGRATE_MOVABLE for all pageblocks covered by the page.

Link: https://lkml.kernel.org/r/20230321002415.20843-1-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 2d3d78d..2d22e47 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -32,6 +32,8 @@
 #endif
 #define MAX_ORDER_NR_PAGES (1 << MAX_ORDER)
 
+#define IS_MAX_ORDER_ALIGNED(pfn) IS_ALIGNED(pfn, MAX_ORDER_NR_PAGES)
+
 /*
  * PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed
  * costly to service.  That is between allocation orders which should

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 53fb8e9..c88fbe7 100644 (file)
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1951,9 +1951,10 @@ static void __init deferred_free_range(unsigned long pfn,
        page = pfn_to_page(pfn);
 
        /* Free a large naturally-aligned chunk if possible */
-       if (nr_pages == pageblock_nr_pages && pageblock_aligned(pfn)) {
-               set_pageblock_migratetype(page, MIGRATE_MOVABLE);
-               __free_pages_core(page, pageblock_order);
+       if (nr_pages == MAX_ORDER_NR_PAGES && IS_MAX_ORDER_ALIGNED(pfn)) {
+               for (i = 0; i < nr_pages; i += pageblock_nr_pages)
+                       set_pageblock_migratetype(page + i, MIGRATE_MOVABLE);
+               __free_pages_core(page, MAX_ORDER);
                return;
        }
 
@@ -1977,19 +1978,19 @@ static inline void __init pgdat_init_report_one_done(void)
 /*
  * Returns true if page needs to be initialized or freed to buddy allocator.
  *
- * We check if a current large page is valid by only checking the validity
+ * We check if a current MAX_ORDER block is valid by only checking the validity
  * of the head pfn.
  */
 static inline bool __init deferred_pfn_valid(unsigned long pfn)
 {
-       if (pageblock_aligned(pfn) && !pfn_valid(pfn))
+       if (IS_MAX_ORDER_ALIGNED(pfn) && !pfn_valid(pfn))
                return false;
        return true;
 }
 
 /*
  * Free pages to buddy allocator. Try to free aligned pages in
- * pageblock_nr_pages sizes.
+ * MAX_ORDER_NR_PAGES sizes.
  */
 static void __init deferred_free_pages(unsigned long pfn,
                                       unsigned long end_pfn)
@@ -2000,7 +2001,7 @@ static void __init deferred_free_pages(unsigned long pfn,
                if (!deferred_pfn_valid(pfn)) {
                        deferred_free_range(pfn - nr_free, nr_free);
                        nr_free = 0;
-               } else if (pageblock_aligned(pfn)) {
+               } else if (IS_MAX_ORDER_ALIGNED(pfn)) {
                        deferred_free_range(pfn - nr_free, nr_free);
                        nr_free = 1;
                } else {
@@ -2013,7 +2014,7 @@ static void __init deferred_free_pages(unsigned long pfn,
 
 /*
  * Initialize struct pages.  We minimize pfn page lookups and scheduler checks
- * by performing it only once every pageblock_nr_pages.
+ * by performing it only once every MAX_ORDER_NR_PAGES.
  * Return number of pages initialized.
  */
 static unsigned long  __init deferred_init_pages(struct zone *zone,
@@ -2029,7 +2030,7 @@ static unsigned long  __init deferred_init_pages(struct zone *zone,
                if (!deferred_pfn_valid(pfn)) {
                        page = NULL;
                        continue;
-               } else if (!page || pageblock_aligned(pfn)) {
+               } else if (!page || IS_MAX_ORDER_ALIGNED(pfn)) {
                        page = pfn_to_page(pfn);
                } else {
                        page++;