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#author("2025-09-10T19:34:04+09:00","default:guest","guest") #author("2025-09-10T19:35:17+09:00","default:guest","guest") *参照元 [#ie68ed1b] #backlinks *説明 [#x3793f52] -パス: [[linux-5.15/mm/compaction.c]] -FIXME: これは何？ --説明 **引数 [#ic7439d0] - -struct zone *zone -- --[[linux-5.15/zone]] -unsigned long pfn -- -bool check_source -- -bool check_target -- **返り値 [#f7cffdda] - -bool -- **参考 [#q7f7b49e] *実装 [#kd86fe30] static bool __reset_isolation_pfn(struct zone *zone, unsigned long pfn, bool check_source, bool check_target) { struct page *page = pfn_to_online_page(pfn); struct page *block_page; struct page *end_page; unsigned long block_pfn; if (!page) return false; if (zone != page_zone(page)) return false; if (pageblock_skip_persistent(page)) return false; - --[[linux-5.15/pfn_to_online_page()]] --[[linux-5.15/page_zone()]] --[[linux-5.15/pageblock_skip_persistent()]] /* * If skip is already cleared do no further checking once the * restart points have been set. */ if (check_source && check_target && !get_pageblock_skip(page)) return true; - --[[linux-5.15/get_pageblock_skip()]] /* * If clearing skip for the target scanner, do not select a * non-movable pageblock as the starting point. */ if (!check_source && check_target && get_pageblock_migratetype(page) != MIGRATE_MOVABLE) return false; - --[[linux-5.15/get_pageblock_migratetype()]] /* Ensure the start of the pageblock or zone is online and valid */ block_pfn = pageblock_start_pfn(pfn); block_pfn = max(block_pfn, zone->zone_start_pfn); block_page = pfn_to_online_page(block_pfn); if (block_page) { page = block_page; pfn = block_pfn; } - --[[linux-5.15/pageblock_start_pfn()]] --[[linux-5.15/pfn_to_online_page()]] /* Ensure the end of the pageblock or zone is online and valid */ block_pfn = pageblock_end_pfn(pfn) - 1; block_pfn = min(block_pfn, zone_end_pfn(zone) - 1); end_page = pfn_to_online_page(block_pfn); if (!end_page) return false; - --[[linux-5.15/pageblock_end_pfn()]] --[[linux-5.15/zone_end_pfn()]] --[[linux-5.15/pfn_to_online_page()]] /* * Only clear the hint if a sample indicates there is either a * free page or an LRU page in the block. One or other condition * is necessary for the block to be a migration source/target. */ do { if (check_source && PageLRU(page)) { clear_pageblock_skip(page); return true; } if (check_target && PageBuddy(page)) { clear_pageblock_skip(page); return true; } page += (1 << PAGE_ALLOC_COSTLY_ORDER); pfn += (1 << PAGE_ALLOC_COSTLY_ORDER); } while (page <= end_page); return false; } - --[[linux-5.15/PageLRU()]] --[[linux-5.15/clear_pageblock_skip()]] --[[linux-5.15/PageBuddy()]] *コメント [#xe423354]
