Hi folks,
this is a list of patches I collected while looking at the memory
management sources. Two patches might improve the performance of your
box. The others are more or less cosmetic.
This mail is sent with a kernel using these patches.
Here is a list sorted with decreasing importance:
patch-uk2 makes use of the pgd, pmd and pte quicklists for x86 too;
risky: there might be a reason that 2.4.x doesn't use the
quicklists.
patch-uk6 In 2.4.x _page_hashfn divides struct address_space pointer
with a parameter derived from the size of struct
inode. Deriving this parameter from the size of struct
address_space makes more sense -- at least for me.
patch-uk5 cleans the bd_flush_param union.
patch-uk1 fixes a comment typo in asm-i386/highmem.h.
patch-uk3 fixes a comment typo in asm-i386/pgtable-3level.h.
Ciao,
Uli Kunitz
-- Ulrich Kunitz (gefm21@uumail.de)
--- linux-2.4.2/include/asm-i386/pgalloc.h Thu Feb 22 01:09:57 2001 +++ linux/include/asm-i386/pgalloc.h Sun Mar 4 20:14:50 2001 @@ -92,9 +92,9 @@ free_page((unsigned long)pte); } -#define pte_free_kernel(pte) free_pte_slow(pte) -#define pte_free(pte) free_pte_slow(pte) -#define pgd_free(pgd) free_pgd_slow(pgd) +#define pte_free_kernel(pte) free_pte_fast(pte) +#define pte_free(pte) free_pte_fast(pte) +#define pgd_free(pgd) free_pgd_fast(pgd) #define pgd_alloc() get_pgd_fast() extern inline pte_t * pte_alloc_kernel(pmd_t * pmd, unsigned long address) @@ -145,7 +145,7 @@ * inside the pgd, so has no extra memory associated with it. * (In the PAE case we free the page.) */ -#define pmd_free(pmd) free_pmd_slow(pmd) +#define pmd_free(pmd) free_pmd_fast(pmd) #define pmd_free_kernel pmd_free #define pmd_alloc_kernel pmd_alloc
--- linux-2.4.2/include/linux/pagemap.h Thu Feb 22 01:10:01 2001 +++ linux/include/linux/pagemap.h Sun Mar 4 20:14:50 2001 @@ -58,7 +58,8 @@ */ extern inline unsigned long _page_hashfn(struct address_space * mapping, unsigned long index) { -#define i (((unsigned long) mapping)/(sizeof(struct inode) & ~ (sizeof(struct inode) - 1))) +#define i (((unsigned long) mapping) / \ + (sizeof(struct address_space) & ~ (sizeof(struct address_space) - 1))) #define s(x) ((x)+((x)>>PAGE_HASH_BITS)) return s(i+index) & (PAGE_HASH_SIZE-1); #undef i
--- linux-2.4.2/fs/buffer.c Fri Feb 9 20:29:44 2001 +++ linux/fs/buffer.c Sun Mar 4 19:27:31 2001 @@ -112,19 +112,18 @@ */ union bdflush_param { struct { - int nfract; /* Percentage of buffer cache dirty to - activate bdflush */ - int ndirty; /* Maximum number of dirty blocks to write out per + int nfract; /* Percentage of buffer cache dirty to + activate bdflush */ + int ndirty; /* Maximum number of dirty blocks to write out per wake-cycle */ - int nrefill; /* Number of clean buffers to try to obtain - each time we call refill */ int dummy1; /* unused */ + int dummy2; /* unused */ int interval; /* jiffies delay between kupdate flushes */ int age_buffer; /* Time for normal buffer to age before we flush it */ int nfract_sync; /* Percentage of buffer cache dirty to activate bdflush synchronously */ - int dummy2; /* unused */ - int dummy3; /* unused */ + int dummy3; /* unused */ + int dummy4; /* unused */ } b_un; unsigned int data[N_PARAM]; } bdf_prm = {{30, 64, 64, 256, 5*HZ, 30*HZ, 60, 0, 0}};
--- linux-2.4.2/include/asm-i386/highmem.h Thu Feb 22 01:09:58 2001 +++ linux/include/asm-i386/highmem.h Sun Mar 4 20:14:50 2001 @@ -9,7 +9,7 @@ * * * Redesigned the x86 32-bit VM architecture to deal with - * up to 16 Terrabyte physical memory. With current x86 CPUs + * up to 16 Terabyte physical memory. With current x86 CPUs * we now support up to 64 Gigabytes physical RAM. * * Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
--- linux-2.4.2/include/asm-i386/pgtable-3level.h Wed Oct 18 23:25:46 2000 +++ linux/include/asm-i386/pgtable-3level.h Sun Mar 4 19:25:00 2001 @@ -48,7 +48,7 @@ /* Rules for using set_pte: the pte being assigned *must* be * either not present or in a state where the hardware will * not attempt to update the pte. In places where this is - * not possible, use pte_get_and_clear to obtain the old pte + * not possible, use ptep_get_and_clear to obtain the old pte * value and then use set_pte to update it. -ben */ static inline void set_pte(pte_t *ptep, pte_t pte)
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This archive was generated by hypermail 2b29 : Wed Mar 07 2001 - 21:00:16 EST