Date: Thu, 05 Jun 2008 17:31:50 +0900
From: Yasunori Goto <y-goto@jp.fujitsu.com>
To: Johannes Weiner <hannes@saeurebad.de>
Subject: Re: [PATCH -mm 11/14] bootmem: respect goal more likely
Cc: Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Yinghai Lu <yhlu.kernel@gmail.com>, Andi Kleen <andi@firstfloor.org>,
       linux-kernel@vger.kernel.org
In-Reply-To: <87abi0semc.fsf@saeurebad.de>
References: <20080605115235.6453.E1E9C6FF@jp.fujitsu.com> <87abi0semc.fsf@saeurebad.de>
Message-Id: <20080605170323.645F.E1E9C6FF@jp.fujitsu.com>
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I gotcha!  :-)

 	max -= PFN_DOWN(bdata->node_boot_start);
 	start -= PFN_DOWN(bdata->node_boot_start);
+	fallback -= PFN_DOWN(bdata->node_boot_start);
 
 	if (bdata->last_success > start) {
-		/* Set goal here to trigger a retry on failure */
-		start = goal = ALIGN(bdata->last_success, step);
+		fallback = start; -------------------------------- (*)
+		start = ALIGN(bdata->last_success, step);
 	}

(*) is root cause. "fallback" is set as 0, because start is index of bitmap
at here. When normal zone is allocated first, and DMA zone is required by
alloc_bootmem_low() later and first page is free yet, fallback is set as 0.

+	if (fallback) {
+		start = ALIGN(fallback, step);
+		fallback = 0;
+		goto find_block;
+	}
+

As a result, this retry code is skipped, and alloc_bootmem_low() fails. 
So, when I change here from fallback to a retry_flag, my box can boot up.

Thanks.
-- 
Yasunori Goto 


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