linux-5.15/__reset_isolation_suitable() 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_suitable() へ行く。
  • 1 (2025-09-10 (水) 19:29:20)

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†

/*
 * This function is called to clear all cached information on pageblocks that
 * should be skipped for page isolation when the migrate and free page scanner
 * meet.
 */
static void __reset_isolation_suitable(struct zone *zone)
{
	unsigned long migrate_pfn = zone->zone_start_pfn;
	unsigned long free_pfn = zone_end_pfn(zone) - 1;
	unsigned long reset_migrate = free_pfn;
	unsigned long reset_free = migrate_pfn;
	bool source_set = false;
	bool free_set = false;

	if (!zone->compact_blockskip_flush)
		return;

	zone->compact_blockskip_flush = false;

• • linux-5.15/zone_end_pfn()

	/*
	 * Walk the zone and update pageblock skip information. Source looks
	 * for PageLRU while target looks for PageBuddy. When the scanner
	 * is found, both PageBuddy and PageLRU are checked as the pageblock
	 * is suitable as both source and target.
	 */
	for (; migrate_pfn < free_pfn; migrate_pfn += pageblock_nr_pages,
					free_pfn -= pageblock_nr_pages) {
		cond_resched();

• • linux-5.15/cond_resched()

		/* Update the migrate PFN */
		if (__reset_isolation_pfn(zone, migrate_pfn, true, source_set) &&
		    migrate_pfn < reset_migrate) {
			source_set = true;
			reset_migrate = migrate_pfn;
			zone->compact_init_migrate_pfn = reset_migrate;
			zone->compact_cached_migrate_pfn[0] = reset_migrate;
			zone->compact_cached_migrate_pfn[1] = reset_migrate;
		}

• • linux-5.15/__reset_isolation_pfn()

		/* Update the free PFN */
		if (__reset_isolation_pfn(zone, free_pfn, free_set, true) &&
		    free_pfn > reset_free) {
			free_set = true;
			reset_free = free_pfn;
			zone->compact_init_free_pfn = reset_free;
			zone->compact_cached_free_pfn = reset_free;
		}

• • linux-5.15/__reset_isolation_pfn()

	}

	/* Leave no distance if no suitable block was reset */
	if (reset_migrate >= reset_free) {
		zone->compact_cached_migrate_pfn[0] = migrate_pfn;
		zone->compact_cached_migrate_pfn[1] = migrate_pfn;
		zone->compact_cached_free_pfn = free_pfn;
	}
}

コメント†