The patch titled
Subject: mm: migrate_device: use more folio in migrate_device_unmap()
has been added to the -mm mm-unstable branch. Its filename is
mm-migrate_device-use-more-folio-in-migrate_device_unmap.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-migrate_device-use-more-folio-in-migrate_device_unmap.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: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Subject: mm: migrate_device: use more folio in migrate_device_unmap()
Date: Mon, 26 Aug 2024 14:58:11 +0800
The page for migrate_device_unmap() already has a reference, so it is safe
to convert the page to folio to save a few calls to compound_head(), which
removes the last isolate_lru_page() call.
Link: https://lkml.kernel.org/r/20240826065814.1336616-4-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Reviewed-by: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate_device.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
--- a/mm/migrate_device.c~mm-migrate_device-use-more-folio-in-migrate_device_unmap
+++ a/mm/migrate_device.c
@@ -379,33 +379,33 @@ static unsigned long migrate_device_unma
continue;
}
- /* ZONE_DEVICE pages are not on LRU */
- if (!is_zone_device_page(page)) {
- if (!PageLRU(page) && allow_drain) {
+ folio = page_folio(page);
+ /* ZONE_DEVICE folios are not on LRU */
+ if (!folio_is_zone_device(folio)) {
+ if (!folio_test_lru(folio) && allow_drain) {
/* Drain CPU's lru cache */
lru_add_drain_all();
allow_drain = false;
}
- if (!isolate_lru_page(page)) {
+ if (!folio_isolate_lru(folio)) {
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
restore++;
continue;
}
/* Drop the reference we took in collect */
- put_page(page);
+ folio_put(folio);
}
- folio = page_folio(page);
if (folio_mapped(folio))
try_to_migrate(folio, 0);
- if (page_mapped(page) ||
+ if (folio_mapped(folio) ||
!migrate_vma_check_page(page, fault_page)) {
- if (!is_zone_device_page(page)) {
- get_page(page);
- putback_lru_page(page);
+ if (!folio_is_zone_device(folio)) {
+ folio_get(folio);
+ folio_putback_lru(folio);
}
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-hugetlb-remove-left-over-comment-about-follow_huge_foo.patch
mm-remove-migration-for-hugepage-in-isolate_single_pageblock.patch
mm-memory_hotplug-remove-head-variable-in-do_migrate_range.patch
mm-memory-failure-add-unmap_poisoned_folio.patch
mm-memory_hotplug-check-hwpoisoned-page-firstly-in-do_migrate_range.patch
mm-migrate-add-isolate_folio_to_list.patch
mm-memory_hotplug-unify-huge-lru-non-lru-movable-folio-isolation.patch
mm-migrate_device-convert-to-migrate_device_coherent_folio.patch
mm-migrate_device-use-a-folio-in-migrate_device_range.patch
mm-migrate_device-use-more-folio-in-migrate_device_unmap.patch
mm-migrate_device-use-more-folio-in-migrate_device_finalize.patch
mm-remove-isolate_lru_page.patch
mm-remove-isolate_lru_page-fix.patch
mm-remove-putback_lru_page.patch
