| To: | linux-mips <linux-mips@linux-mips.org>, Ralf <ralf@linux-mips.org> |
|---|---|
| Subject: | Fwd: [RFC] Calculate exactly how many ptr is needed for pgd |
| From: | "Dajie Tan" <jiankemeng@gmail.com> |
| Date: | Thu, 2 Aug 2007 07:55:48 +0400 |
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| In-reply-to: | <5861a7880708012054u404c9b02s7141d1811d4a7fdf@mail.gmail.com> |
| Original-recipient: | rfc822;linux-mips@linux-mips.org |
| References: | <46AF4981.1090601@lemote.com> <5861a7880708012054u404c9b02s7141d1811d4a7fdf@mail.gmail.com> |
| Sender: | linux-mips-bounce@linux-mips.org |
It works well. If I start xorg+xfce, it can save 2.5MB memory in my system. Thanks, songmao. 2007/7/31, Songmao Tian <tiansm@lemote.com>: > Under 32-bit kernel with 4k page, a page is needed for a pgd, > but when page size > 4k, a page will be too much. > > diff --git a/include/asm-mips/pgtable-32.h b/include/asm-mips/pgtable-32.h > index 2fbd47e..2a16240 100644 > --- a/include/asm-mips/pgtable-32.h > +++ b/include/asm-mips/pgtable-32.h > @@ -67,7 +67,8 @@ extern int add_temporary_entry(unsigned long entrylo0, > unsigned long entrylo1, > #define PTE_ORDER 0 > #endif > > -#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) > +/* Using a page for pgd will be a waste when page size > 4k */ > +#define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT)) > #define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) > > #define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE) > > -- 为天地立心 为生民立命 为往圣继绝学 为万世开太平 |
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