The patch titled
Subject: mm: migrate_device: unify migrate folio for MIGRATE_SYNC_NO_COPY
has been added to the -mm mm-unstable branch. Its filename is
mm-migrate_device-unify-migrate-folio-for-migrate_sync_no_copy.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-unify-migrate-folio-for-migrate_sync_no_copy.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: unify migrate folio for MIGRATE_SYNC_NO_COPY
Date: Fri, 24 May 2024 13:28:41 +0800
The __migrate_device_pages() won't copy page so MIGRATE_SYNC_NO_COPY
passed into migrate_folio()/migrate_folio_extra(), actually a easy way is
just to call folio_migrate_mapping()/folio_migrate_flags(), converting it
to unify and simplify the migrate device pages, which also remove the only
call for MIGRATE_SYNC_NO_COPY.
Link: https://lkml.kernel.org/r/20240524052843.182275-4-wangkefeng.wang@xxxxxxxxxx
Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Benjamin LaHaise <bcrl@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jérôme Glisse <jglisse@xxxxxxxxxx>
Cc: Jiaqi Yan <jiaqiyan@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Naoya Horiguchi <nao.horiguchi@xxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate_device.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/mm/migrate_device.c~mm-migrate_device-unify-migrate-folio-for-migrate_sync_no_copy
+++ a/mm/migrate_device.c
@@ -693,7 +693,7 @@ static void __migrate_device_pages(unsig
struct page *page = migrate_pfn_to_page(src_pfns[i]);
struct address_space *mapping;
struct folio *newfolio, *folio;
- int r;
+ int r, extra_cnt = 0;
if (!newpage) {
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
@@ -754,14 +754,15 @@ static void __migrate_device_pages(unsig
continue;
}
+ BUG_ON(folio_test_writeback(folio));
+
if (migrate && migrate->fault_page == page)
- r = migrate_folio_extra(mapping, newfolio, folio,
- MIGRATE_SYNC_NO_COPY, 1);
- else
- r = migrate_folio(mapping, newfolio, folio,
- MIGRATE_SYNC_NO_COPY);
+ extra_cnt = 1;
+ r = folio_migrate_mapping(mapping, newfolio, folio, extra_cnt);
if (r != MIGRATEPAGE_SUCCESS)
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
+ else
+ folio_migrate_flags(newfolio, folio);
}
if (notified)
_
Patches currently in -mm which might be from wangkefeng.wang@xxxxxxxxxx are
mm-add-folio_alloc_mpol.patch
mm-mempolicy-use-folio_alloc_mpol_noprof-in-vma_alloc_folio_noprof.patch
mm-mempolicy-use-folio_alloc_mpol-in-alloc_migration_target_by_mpol.patch
mm-shmem-use-folio_alloc_mpol-in-shmem_alloc_folio.patch
mm-refactor-folio_undo_large_rmappable.patch
mm-memcontrol-remove-page_memcg.patch
rmap-remove-define_page_vma_walk.patch
mm-migrate-simplify-__buffer_migrate_folio.patch
mm-migrate_device-use-a-newfolio-in-__migrate_device_pages.patch
mm-migrate_device-unify-migrate-folio-for-migrate_sync_no_copy.patch
mm-migrate-remove-migrate_folio_extra.patch
mm-remove-migrate_sync_no_copy-mode.patch
