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mm: page_alloc: set migratetype inside move_freepages()

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This avoids changing migratetype after move_freepages() or
move_freepages_block(), which is error prone.  It also prepares for
upcoming changes to fix move_freepages() not moving free pages partially
in the range.

Link: https://lkml.kernel.org/r/20240320180429.678181-9-hannes@cmpxchg.org
Signed-off-by: Zi Yan <ziy@nvidia.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2024-03-20 14:02:13 -04:00 committed by Andrew Morton
parent 55612e80e7
commit f37c0f6876
2 changed files with 16 additions and 18 deletions
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27
mm/page_alloc.c
View file

@ -1586,9 +1586,8 @@ static inline struct page *__rmqueue_cma_fallback(struct zone *zone,
#endif
/*
* Move the free pages in a range to the freelist tail of the requested type.
* Note that start_page and end_pages are not aligned on a pageblock
* boundary. If alignment is required, use move_freepages_block()
* Change the type of a block and move all its free pages to that
* type's freelist.
*/
static int move_freepages(struct zone *zone, unsigned long start_pfn,
unsigned long end_pfn, int migratetype)
@ -1598,6 +1597,9 @@ static int move_freepages(struct zone *zone, unsigned long start_pfn,
unsigned int order;
int pages_moved = 0;
VM_WARN_ON(start_pfn & (pageblock_nr_pages - 1));
VM_WARN_ON(start_pfn + pageblock_nr_pages - 1 != end_pfn);
for (pfn = start_pfn; pfn <= end_pfn;) {
page = pfn_to_page(pfn);
if (!PageBuddy(page)) {
@ -1615,6 +1617,8 @@ static int move_freepages(struct zone *zone, unsigned long start_pfn,
pages_moved += 1 << order;
}
set_pageblock_migratetype(pfn_to_page(start_pfn), migratetype);
return pages_moved;
}
@ -1842,7 +1846,6 @@ steal_suitable_fallback(struct zone *zone, struct page *page,
if (free_pages + alike_pages >= (1 << (pageblock_order-1)) ||
page_group_by_mobility_disabled) {
move_freepages(zone, start_pfn, end_pfn, start_type);
set_pageblock_migratetype(page, start_type);
return __rmqueue_smallest(zone, order, start_type);
}
@ -1916,12 +1919,10 @@ static void reserve_highatomic_pageblock(struct page *page, struct zone *zone)
/* Yoink! */
mt = get_pageblock_migratetype(page);
/* Only reserve normal pageblocks (i.e., they can merge with others) */
if (migratetype_is_mergeable(mt)) {
if (move_freepages_block(zone, page, MIGRATE_HIGHATOMIC) != -1) {
set_pageblock_migratetype(page, MIGRATE_HIGHATOMIC);
if (migratetype_is_mergeable(mt))
if (move_freepages_block(zone, page,
MIGRATE_HIGHATOMIC) != -1)
zone->nr_reserved_highatomic += pageblock_nr_pages;
}
}
out_unlock:
spin_unlock_irqrestore(&zone->lock, flags);
@ -2000,7 +2001,6 @@ static bool unreserve_highatomic_pageblock(const struct alloc_context *ac,
* not fail on zone boundaries.
*/
WARN_ON_ONCE(ret == -1);
set_pageblock_migratetype(page, ac->migratetype);
if (ret > 0) {
spin_unlock_irqrestore(&zone->lock, flags);
return ret;
@ -2682,10 +2682,9 @@ int __isolate_free_page(struct page *page, unsigned int order)
* Only change normal pageblocks (i.e., they can merge
* with others)
*/
if (migratetype_is_mergeable(mt) &&
move_freepages_block(zone, page,
MIGRATE_MOVABLE) != -1)
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
if (migratetype_is_mergeable(mt))
move_freepages_block(zone, page,
MIGRATE_MOVABLE);
}
}

7
mm/page_isolation.c
View file

@ -188,7 +188,6 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_
return -EBUSY;
}
__mod_zone_freepage_state(zone, -nr_pages, mt);
set_pageblock_migratetype(page, MIGRATE_ISOLATE);
zone->nr_isolate_pageblock++;
spin_unlock_irqrestore(&zone->lock, flags);
return 0;
@ -262,10 +261,10 @@ static void unset_migratetype_isolate(struct page *page, int migratetype)
*/
WARN_ON_ONCE(nr_pages == -1);
__mod_zone_freepage_state(zone, nr_pages, migratetype);
}
set_pageblock_migratetype(page, migratetype);
if (isolated_page)
} else {
set_pageblock_migratetype(page, migratetype);
__putback_isolated_page(page, order, migratetype);
}
zone->nr_isolate_pageblock--;
out:
spin_unlock_irqrestore(&zone->lock, flags);