The patch titled
Subject: mm/compaction: optimize >0 order folio compaction with free page split.
has been added to the -mm mm-unstable branch. Its filename is
mm-compaction-optimize-0-order-folio-compaction-with-free-page-split.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-compaction-optimize-0-order-folio-compaction-with-free-page-split.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Zi Yan <ziy@xxxxxxxxxx>
Subject: mm/compaction: optimize >0 order folio compaction with free page split.
Date: Tue, 20 Feb 2024 13:32:20 -0500
During migration in a memory compaction, free pages are placed in an array
of page lists based on their order. But the desired free page order
(i.e., the order of a source page) might not be always present, thus
leading to migration failures and premature compaction termination. Split
a high order free pages when source migration page has a lower order to
increase migration successful rate.
Note: merging free pages when a migration fails and a lower order free
page is returned via compaction_free() is possible, but there is too much
work. Since the free pages are not buddy pages, it is hard to identify
these free pages using existing PFN-based page merging algorithm.
Link: https://lkml.kernel.org/r/20240220183220.1451315-5-zi.yan@xxxxxxxx
Signed-off-by: Zi Yan <ziy@xxxxxxxxxx>
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reviewed-by: Vlastimil Babka <vbabka@xxxxxxx>
Tested-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Tested-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Adam Manzanares <a.manzanares@xxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Huang Ying <ying.huang@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yin Fengwei <fengwei.yin@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/compaction.c | 35 ++++++++++++++++++++++++++++++-----
1 file changed, 30 insertions(+), 5 deletions(-)
--- a/mm/compaction.c~mm-compaction-optimize-0-order-folio-compaction-with-free-page-split
+++ a/mm/compaction.c
@@ -1856,15 +1856,40 @@ static struct folio *compaction_alloc(st
struct compact_control *cc = (struct compact_control *)data;
struct folio *dst;
int order = folio_order(src);
+ bool has_isolated_pages = false;
+ int start_order;
+ struct page *freepage;
+ unsigned long size;
- if (list_empty(&cc->freepages[order])) {
- isolate_freepages(cc);
- if (list_empty(&cc->freepages[order]))
+again:
+ for (start_order = order; start_order < NR_PAGE_ORDERS; start_order++)
+ if (!list_empty(&cc->freepages[start_order]))
+ break;
+
+ /* no free pages in the list */
+ if (start_order == NR_PAGE_ORDERS) {
+ if (has_isolated_pages)
return NULL;
+ isolate_freepages(cc);
+ has_isolated_pages = true;
+ goto again;
+ }
+
+ freepage = list_first_entry(&cc->freepages[start_order], struct page,
+ lru);
+ size = 1 << start_order;
+
+ list_del(&freepage->lru);
+
+ while (start_order > order) {
+ start_order--;
+ size >>= 1;
+
+ list_add(&freepage[size].lru, &cc->freepages[start_order]);
+ set_page_private(&freepage[size], start_order);
}
+ dst = (struct folio *)freepage;
- dst = list_first_entry(&cc->freepages[order], struct folio, lru);
- list_del(&dst->lru);
post_alloc_hook(&dst->page, order, __GFP_MOVABLE);
if (order)
prep_compound_page(&dst->page, order);
_
Patches currently in -mm which might be from ziy@xxxxxxxxxx are
mm-page_alloc-remove-unused-fpi_flags-in-free_pages_prepare.patch
mm-compaction-enable-compacting-0-order-folios.patch
mm-compaction-add-support-for-0-order-folio-memory-compaction.patch
mm-compaction-optimize-0-order-folio-compaction-with-free-page-split.patch
