Commit 45dbef4c authored Dec 05, 2023 by Ma Wupeng Committed by Wupeng Ma Dec 05, 2023

mm: page_eject: Add mc support during offline page

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K5CO



--------------------------------

During offline page in page ejection, page is copied in kernel space
in migrate page, set PF_MCS to task flags which will call
migrate_page_mc_extra to support mc.

Signed-off-by: Ma Wupeng <mawupeng1@huawei.com>

parent b7f5b9ef

drivers/ras/page_eject.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -77,8 +77,13 @@ static int page_eject_offline_page(unsigned long pfn)
		* if soft_offline_page return 0 because PageHWPoison, this pfn
		* will add to list and this add will be removed during online
		* since it is poisoned.
		*
		* Update task flag with PF_MCS to enable mc support during page
		* migration.
		*/
		current->flags \|= PF_MCS;
		ret = soft_offline_page(pfn, 0);
		current->flags &= ~PF_MCS;
		if (ret) {
		pr_err("page fail to be offlined, soft_offline_page failed(%d), pfn=%#lx\n",
		ret, pfn);

mm/migrate.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -738,6 +738,12 @@ int migrate_page_extra(struct address_space *mapping,

		BUG_ON(PageWriteback(page)); /* Writeback must be complete */

		if (unlikely(IS_ENABLED(CONFIG_ARCH_HAS_COPY_MC) &&
		(current->flags & PF_MCS) &&
		(mode != MIGRATE_SYNC_NO_COPY)))
		return migrate_page_mc_extra(mapping, newpage, page, mode,
		extra_count);

		rc = migrate_page_move_mapping(mapping, newpage, page, extra_count);

		if (rc != MIGRATEPAGE_SUCCESS)