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Subject: RE: [Patch] Move swiotlb_init early on X86_64
Date: Thu, 2 Mar 2006 17:09:37 +0800
Message-ID: <117E3EB5059E4E48ADFF2822933287A441C94D@pdsmsx404>
Thread-Topic: [Patch] Move swiotlb_init early on X86_64
Thread-Index: AcY9wOdNLltttlgOR8yfDIBgphfCAQAF+ogg
From: "Zhang, Yanmin" <yanmin.zhang@intel.com>
To: "Zou, Nanhai" <nanhai.zou@intel.com>, "Andi Kleen" <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>, "LKML" <linux-kernel@vger.kernel.org>,
       "Andrew Morton" <akpm@osdl.org>,
       "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1274
Lines: 38

>>-----Original Message-----
>>From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Zou Nan hai
>>Sent: 2006??3??2?? 12:33
>>
>>Really, then how about the following patch?
>>
>>Let normal bootmem allocator go above 4G first.
>>This will save more memory with address less than 4G.
>>
>>Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
>>
>>--- linux-2.6.16-rc5/mm/bootmem.c	2006-03-03 08:31:52.000000000 +0800
>>+++ b/mm/bootmem.c	2006-03-03 09:05:17.000000000 +0800
>>@@ -381,16 +381,24 @@ unsigned long __init free_all_bootmem (v
>> 	return(free_all_bootmem_core(NODE_DATA(0)));
>> }
>>
>>+#define LOW32LIMIT 0xffffffff
>>+
>> void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal)
>> {
>> 	pg_data_t *pgdat = pgdat_list;
>> 	void *ptr;
>>
>>+	if (goal < LOW32LIMIT) {
On i386, above is always true.


>>+		for_each_pgdat(pgdat)
>>+			if ((ptr = __alloc_bootmem_core(pgdat->bdata, size,
>>+						 align, LOW32LIMIT, 0)))
>>+			return(ptr);
>>+	}
-
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