linux-5.15/__reset_isolation_pfn() 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-5.15/__reset_isolation_pfn() へ行く。
  • 1 (2025-09-10 (水) 19:34:04)

参照元†

• linux-5.15/__reset_isolation_suitable()

説明†

• パス: linux-5.15/mm/compaction.c

• FIXME: これは何？
  • 説明

引数†

返り値†

参考†

実装†

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†