linux-4.4.1/start_isolate_page_range() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/start_isolate_page_range() へ行く。
  • 1 (2017-09-15 (金) 19:33:35)

参照元†

• linux-4.4.1/alloc_contig_range()

説明†

• パス: [[linux-4.4.1/]]

• FIXME: これは何？
  • 説明

引数†

• unsigned long start_pfn
• unsigned long end_pfn
• unsigned migratetype
• bool skip_hwpoisoned_pages

返り値†

• int

参考†

実装†

/*
 * start_isolate_page_range() -- make page-allocation-type of range of pages
 * to be MIGRATE_ISOLATE.
 * @start_pfn: The lower PFN of the range to be isolated.
 * @end_pfn: The upper PFN of the range to be isolated.
 * @migratetype: migrate type to set in error recovery.
 *
 * Making page-allocation-type to be MIGRATE_ISOLATE means free pages in
 * the range will never be allocated. Any free pages and pages freed in the
 * future will not be allocated again.
 *
 * start_pfn/end_pfn must be aligned to pageblock_order.
 * Returns 0 on success and -EBUSY if any part of range cannot be isolated.
 */     
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
                             unsigned migratetype, bool skip_hwpoisoned_pages)
{
        unsigned long pfn;
        unsigned long undo_pfn;
        struct page *page;

• • linux-4.4.1/page

        BUG_ON((start_pfn) & (pageblock_nr_pages - 1));
        BUG_ON((end_pfn) & (pageblock_nr_pages - 1));

• • linux-4.4.1/BUG_ON()
  • linux-4.4.1/pageblock_nr_pages(global)

        for (pfn = start_pfn;
             pfn < end_pfn;
             pfn += pageblock_nr_pages) {
                page = __first_valid_page(pfn, pageblock_nr_pages);
                if (page &&
                    set_migratetype_isolate(page, skip_hwpoisoned_pages)) {
                        undo_pfn = pfn;
                        goto undo;
                }
        }

• • linux-4.4.1/__first_valid_page()
  • linux-4.4.1/set_migratetype_isolate()

        return 0;
undo:
        for (pfn = start_pfn;
             pfn < undo_pfn;
             pfn += pageblock_nr_pages)
                unset_migratetype_isolate(pfn_to_page(pfn), migratetype);

• • linux-4.4.1/unset_migratetype_isolate()
  • linux-4.4.1/pfn_to_page()

        return -EBUSY;
}

コメント†