linux-5.15/pgdat_balanced() 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/pgdat_balanced() へ行く。
  • 1 (2025-09-11 (木) 16:48:22)

参照元†

• linux-5.15/balance_pgdat()
• linux-5.15/prepare_kswapd_sleep()

説明†

• パス: linux-5.15/mm/vmscan.c

• FIXME: これは何？
  • 説明

引数†

• pg_data_t *pgdat
  • [[linux-5.15/]]
• int order
• int highest_zoneidx

返り値†

• bool

参考†

実装†

/*
 * Returns true if there is an eligible zone balanced for the request order
 * and highest_zoneidx
 */
static bool pgdat_balanced(pg_data_t *pgdat, int order, int highest_zoneidx)
{
	int i;
	unsigned long mark = -1;
	struct zone *zone;

	/*
	 * Check watermarks bottom-up as lower zones are more likely to
	 * meet watermarks.
	 */
	for (i = 0; i <= highest_zoneidx; i++) {
		zone = pgdat->node_zones + i;

		if (!managed_zone(zone))
			continue;

		mark = high_wmark_pages(zone);
		if (zone_watermark_ok_safe(zone, order, mark, highest_zoneidx))
			return true;
	}

• • linux-5.15/managed_zone()
  • linux-5.15/high_wmark_pages()
  • linux-5.15/zone_watermark_ok_safe()

	/*
	 * If a node has no populated zone within highest_zoneidx, it does not
	 * need balancing by definition. This can happen if a zone-restricted
	 * allocation tries to wake a remote kswapd.
	 */
	if (mark == -1)
		return true;

	return false;
}

コメント†