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mm: memory_hotplug: remove head variable in do_migrate_range()

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Patch series "mm: memory_hotplug: improve do_migrate_range()", v3.

Unify hwpoisoned page handling and isolation of HugeTLB/LRU/non-LRU
movable page, also convert to use folios in do_migrate_range().


This patch (of 5):

Directly use a folio for HugeTLB and THP when calculate the next pfn, then
remove unused head variable.

Link: https://lkml.kernel.org/r/20240827114728.3212578-1-wangkefeng.wang@huawei.com
Link: https://lkml.kernel.org/r/20240827114728.3212578-2-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2024-08-27 19:47:24 +08:00 • committed by Andrew Morton
parent f66ac836d4
commit b62b51d2d1
1 changed files with 14 additions and 8 deletions
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18
mm/memory_hotplug.c
View file

@ -1773,7 +1773,7 @@ found:
static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long pfn;
struct page *page, *head;
struct page *page;
LIST_HEAD(source);
static DEFINE_RATELIMIT_STATE(migrate_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
@ -1786,14 +1786,20 @@ static void do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
continue;
page = pfn_to_page(pfn);
folio = page_folio(page);
head = &folio->page;
if (PageHuge(page)) {
pfn = page_to_pfn(head) + compound_nr(head) - 1;
/*
* No reference or lock is held on the folio, so it might
* be modified concurrently (e.g. split). As such,
* folio_nr_pages() may read garbage. This is fine as the outer
* loop will revisit the split folio later.
*/
if (folio_test_large(folio)) {
pfn = folio_pfn(folio) + folio_nr_pages(folio) - 1;
if (folio_test_hugetlb(folio)) {
isolate_hugetlb(folio, &source);
continue;
} else if (PageTransHuge(page))
pfn = page_to_pfn(head) + thp_nr_pages(page) - 1;
}
}
/*
* HWPoison pages have elevated reference counts so the migration would