From: Songmao Tian <tiansm@lemote.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Dajie Tan <jiankemeng@gmail.com>, linux-mips <linux-mips@linux-mips.org>
Subject: Re: [PATCH] 16K page size in 32 bit kernel
Date: Tue, 31 Jul 2007 21:49:34 +0800 [thread overview]
Message-ID: <46AF3DEE.2080603@lemote.com> (raw)
In-Reply-To: <20070731100027.GA3983@linux-mips.org>
Ralf Baechle wrote:
> On Tue, Jul 31, 2007 at 05:09:51PM +0400, Dajie Tan wrote:
>
>
>> 32-bit Kernel for loongson2e currently use 16KB page size to avoid
>> cache alias problem.So, the definiton of PGDIR_SHIFT muse be 12+14.
>>
>> Using 22 in 16K page size do not lead to a serious problem but the number
>> of pages allocated for page table is more than previous. (cat
>> /proc/vmstat | grep nr_page_table_pages)
>>
>> It's been tested on FuLong mini PC(loongson2e inside).
>>
>
> Looking good, applied. Thanks!
>
> Did by coincidence any of you try 64K pages with a 32-bit kernel?
>
> Ralf
>
>
>
>
I think the following is more complete?
#ifdef CONFIG_64BIT_PHYS_ADDR
-#define PGDIR_SHIFT 21
+#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 3))
#else
-#define PGDIR_SHIFT 22
+#define PGDIR_SHIFT (PAGE_SHIFT + (PAGE_SHIFT + PTE_ORDER - 2))
#endif
next prev parent reply other threads:[~2007-07-31 13:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-31 13:09 [PATCH] 16K page size in 32 bit kernel Dajie Tan
2007-07-31 9:37 ` Songmao Tian
2007-07-31 9:37 ` Songmao Tian
2007-07-31 10:00 ` Ralf Baechle
2007-07-31 13:49 ` Songmao Tian [this message]
2007-07-31 20:45 ` Ralf Baechle
2007-08-01 0:47 ` Songmao Tian
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