linux-5.15/__rmqueue_pcplist() の履歴(No.1)

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• linux-5.15/__rmqueue_pcplist() へ行く。
  • 1 (2025-09-13 (土) 01:35:25)

参照元†

• linux-5.15/rmqueue_pcplist()

説明†

• パス: linux-5.15/mm/page_alloc.c

• FIXME: これは何？
  • 説明

引数†

返り値†

参考†

実装†

/* Remove page from the per-cpu list, caller must protect the list */
static inline
struct page *__rmqueue_pcplist(struct zone *zone, unsigned int order,
			int migratetype,
			unsigned int alloc_flags,
			struct per_cpu_pages *pcp,
			struct list_head *list)
{
	struct page *page;

	do {
		if (list_empty(list)) {
			int batch = READ_ONCE(pcp->batch);
			int alloced;

• • linux-5.15/page
  • linux-5.15/list_empty()
  • linux-5.15/READ_ONCE()

			/*
			 * Scale batch relative to order if batch implies
			 * free pages can be stored on the PCP. Batch can
			 * be 1 for small zones or for boot pagesets which
			 * should never store free pages as the pages may
			 * belong to arbitrary zones.
			 */
			if (batch > 1)
				batch = max(batch >> order, 2);
			alloced = rmqueue_bulk(zone, order,
					batch, list,
					migratetype, alloc_flags);

			pcp->count += alloced << order;
			if (unlikely(list_empty(list)))
				return NULL;
		}

• • linux-5.15/rmqueue_bulk()
  • linux-5.15/unlikely()
  • linux-5.15/list_empty()

		page = list_first_entry(list, struct page, lru);
		list_del(&page->lru);
		pcp->count -= 1 << order;
	} while (check_new_pcp(page));

	return page;
}

• • linux-5.15/list_first_entry()
  • linux-5.15/list_del()
  • linux-5.15/check_new_pcp()

コメント†