linux-5.15/rmqueue() の履歴(No.1)

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• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-5.15/rmqueue() へ行く。
  • 1 (2025-09-13 (土) 01:21:55)

参照元†

• linux-5.15/get_page_from_freelist()

説明†

• パス: [[linux-5.15/]]

• FIXME: これは何？
  • 説明

引数†

返り値†

参考†

実装†

/*
 * Allocate a page from the given zone. Use pcplists for order-0 allocations.
 */
static inline
struct page *rmqueue(struct zone *preferred_zone,
			struct zone *zone, unsigned int order,
			gfp_t gfp_flags, unsigned int alloc_flags,
			int migratetype)
{
	unsigned long flags;
	struct page *page;

	if (likely(pcp_allowed_order(order))) {
		/*
		 * MIGRATE_MOVABLE pcplist could have the pages on CMA area and
		 * we need to skip it when CMA area isn't allowed.
		 */
		if (!IS_ENABLED(CONFIG_CMA) || alloc_flags & ALLOC_CMA ||
				migratetype != MIGRATE_MOVABLE) {
			page = rmqueue_pcplist(preferred_zone, zone, order,
					gfp_flags, migratetype, alloc_flags);
			goto out;
		}
	}

• • linux-5.15/likely()
  • linux-5.15/pcp_allowed_order()
  • linux-5.15/IS_ENABLED()
  • linux-5.15/rmqueue_pcplist()

	/*
	 * We most definitely don't want callers attempting to
	 * allocate greater than order-1 page units with __GFP_NOFAIL.
	 */
	WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1));
	spin_lock_irqsave(&zone->lock, flags);

• • linux-5.15/WARN_ON_ONCE()
  • linux-5.15/spin_lock_irqsave()

	do {
		page = NULL;
		/*
		 * order-0 request can reach here when the pcplist is skipped
		 * due to non-CMA allocation context. HIGHATOMIC area is
		 * reserved for high-order atomic allocation, so order-0
		 * request should skip it.
		 */
		if (order > 0 && alloc_flags & ALLOC_HARDER) {
			page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC);
			if (page)
				trace_mm_page_alloc_zone_locked(page, order, migratetype);
		}
		if (!page)
			page = __rmqueue(zone, order, migratetype, alloc_flags);
	} while (page && check_new_pages(page, order));
	if (!page)
		goto failed;

• • linux-5.15/__rmqueue_smallest()
  • linux-5.15/trace_mm_page_alloc_zone_locked()
  • linux-5.15/__rmqueue()
  • linux-5.15/check_new_pages()

	__mod_zone_freepage_state(zone, -(1 << order),
				  get_pcppage_migratetype(page));
	spin_unlock_irqrestore(&zone->lock, flags);

	__count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
	zone_statistics(preferred_zone, zone, 1);

• • linux-5.15/__mm_zone_freepage_state()
  • linux-5.15/get_pcppage_migratetype()
  • linux-5.15/spin_unlock_irqrestore()
  • linux-5.15/__count_zid_vm_events()
  • linux-5.15/page_zonenum()
  • linux-5.15/zone_statistics()

out:
	/* Separate test+clear to avoid unnecessary atomics */
	if (test_bit(ZONE_BOOSTED_WATERMARK, &zone->flags)) {
		clear_bit(ZONE_BOOSTED_WATERMARK, &zone->flags);
		wakeup_kswapd(zone, 0, 0, zone_idx(zone));
	}

	VM_BUG_ON_PAGE(page && bad_range(zone, page), page);
	return page;

• • linux-5.15/test_bit()
  • linux-5.15/clear_bit()
  • linux-5.15/wakeup_kswapd()
  • linux-5.15/zone_idx()
  • linux-5.15/VM_BUG_ON_PAGE()
  • linux-5.15/bad_range()

failed:
	spin_unlock_irqrestore(&zone->lock, flags);
	return NULL;
}

• • linux-5.15/spin_unlock_irqrestore()

コメント†