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mm: migrate_device: use more folio in migrate_device_unmap()

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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@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2024-08-26 14:58:11 +08:00 committed by Andrew Morton
parent 53456b7b3f
commit 39e618d986
1 changed files with 10 additions and 10 deletions
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20
mm/migrate_device.c
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@ -379,33 +379,33 @@ static unsigned long migrate_device_unmap(unsigned long *src_pfns,
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;