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mm/compaction: stop recording free page order in page->private

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Commit 733aea0b3a ("mm/compaction: add support for >0 order folio
memory compaction.") stores isolated free pages in an array indexed by
free page orders, it is no longer needed to store the order in each page's
->private field.  And there is no code using the stored order.  Stop doing
that.

It also prepares for an upcoming change that ensures subpage->private is
zero at page free time and the removal of set_page_private(0) from
prep_compound_tail().

Link: https://lore.kernel.org/20260709-keep-subpage-private-zero-at-free-v3-2-7e4fe155f5b9@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2026-07-09 14:06:02 -04:00 committed by Andrew Morton
parent f283f6a4e1
commit 7ae5a5d8ec
1 changed files with 0 additions and 3 deletions
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3
mm/compaction.c
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@ -645,7 +645,6 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
isolated = __isolate_free_page(page, order);
if (!isolated)
break;
set_page_private(page, order);
nr_scanned += isolated - 1;
total_isolated += isolated;
@ -1618,7 +1617,6 @@ static void fast_isolate_freepages(struct compact_control *cc)
/* Isolate the page if available */
if (page) {
if (__isolate_free_page(page, order)) {
set_page_private(page, order);
nr_isolated = 1 << order;
nr_scanned += nr_isolated - 1;
total_isolated += nr_isolated;
@ -1847,7 +1845,6 @@ static struct folio *compaction_alloc_noprof(struct folio *src, unsigned long da
size >>= 1;
list_add(&freepage[size].lru, &cc->freepages[start_order]);
set_page_private(&freepage[size], start_order);
}
dst = (struct folio *)freepage;