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SubjectRe: [PATCH] i386 uaccess to fixmap pages
Linus Torvalds wrote:
> On Fri, 9 May 2003, Jamie Lokier wrote:
>
>>Why don't you change TASK_SIZE to 0xc0001000 (or so) and place the
>>user-visible fixmaps at 0xc0000000?
>
> I think I almost agree..
>
>>That would have no cost at all.
>
> It actually does have some cost in that form, namely the fact that the
> kernel 1:1 mapping needs to be 4MB-aligned in order to take advantage of
> large-pte support. So we'd have to move the kernel to something like
> 0xc0400000 (and preferably higher, to make sure there is a nice hole in
> between - say 0xc1000000), which in turn has a cost of verifying that
> nothing assumes the current lay-out (we've had the 1/2/3GB TASK_SIZE
> patches floating around, but they've never had "odd sizes").

We've been playing with patches in the -mjb tree which make PAGE_OFFSET
and TASK_SIZE move to some weird values. I have it to the point where I
could do a 3.875:0.125 user:kernel split. It was created to let some
crazy database nuts get 3.5:0.5 with PAE on. But, it should be mostly
applicable here. The attached banana_split batch does this, and depends
on the separate_pmd patch.

> There's another cost, which is that right now we share the pgd with the
> kernel fixmaps, and this would mean that we'd have a new one. That's just
> a single page, though.

Do you mean we share the pmd, not the pgd, right? The attached
separate_pmd patch unshares the kernel pmd page. It keeps a separate
slab of kernel pmds, but suffers from the same problem which Bill Irwin
just fixed with PGDs, where the pages in the slab might need to get
updated mappings. They will need the same treatment as the non-PAE pgds.

http://marc.theaimsgroup.com/?l=linux-kernel&m=105213208522985&w=2

Don't anyone go applying these yet, though. I think there has been a
bugfix or two since Martin released 2.5.68-mjb1, where these came from.
So, consider them just an example for now.

--
Dave Hansen
haveblue@us.ibm.com
diff -urpN -X /home/fletch/.diff.exclude 520-queuestat/arch/i386/mm/init.c 540-separate_pmd/arch/i386/mm/init.c
--- 520-queuestat/arch/i386/mm/init.c Sun Apr 20 22:07:17 2003
+++ 540-separate_pmd/arch/i386/mm/init.c Sun Apr 20 22:22:15 2003
@@ -514,9 +514,11 @@ void __init mem_init(void)
#include <linux/slab.h>

kmem_cache_t *pmd_cache;
+kmem_cache_t *kernel_pmd_cache;
kmem_cache_t *pgd_cache;

void pmd_ctor(void *, kmem_cache_t *, unsigned long);
+void kernel_pmd_ctor(void *, kmem_cache_t *, unsigned long);
void pgd_ctor(void *, kmem_cache_t *, unsigned long);

void __init pgtable_cache_init(void)
@@ -528,9 +530,18 @@ void __init pgtable_cache_init(void)
SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN,
pmd_ctor,
NULL);
-
if (!pmd_cache)
panic("pgtable_cache_init(): cannot create pmd cache");
+
+ kernel_pmd_cache = kmem_cache_create("pae_kernel_pmd",
+ (PTRS_PER_PMD*sizeof(pmd_t))*KERNEL_PGD_PTRS,
+ 0,
+ SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN,
+ kernel_pmd_ctor,
+ NULL);
+
+ if (!kernel_pmd_cache)
+ panic("pgtable_cache_init(): cannot create kernel pmd cache");
}

/*
diff -urpN -X /home/fletch/.diff.exclude 520-queuestat/arch/i386/mm/pgtable.c 540-separate_pmd/arch/i386/mm/pgtable.c
--- 520-queuestat/arch/i386/mm/pgtable.c Mon Mar 17 21:43:39 2003
+++ 540-separate_pmd/arch/i386/mm/pgtable.c Sun Apr 20 22:22:15 2003
@@ -136,7 +136,7 @@ pte_t *pte_alloc_one_kernel(struct mm_st

do {
pte = (pte_t *) __get_free_page(GFP_KERNEL);
- if (pte)
+ if (pte)
clear_page(pte);
else {
current->state = TASK_UNINTERRUPTIBLE;
@@ -168,6 +168,7 @@ struct page *pte_alloc_one(struct mm_str
}

extern kmem_cache_t *pmd_cache;
+extern kmem_cache_t *kernel_pmd_cache;
extern kmem_cache_t *pgd_cache;

void pmd_ctor(void *__pmd, kmem_cache_t *pmd_cache, unsigned long flags)
@@ -175,6 +176,15 @@ void pmd_ctor(void *__pmd, kmem_cache_t
clear_page(__pmd);
}

+void kernel_pmd_ctor(void *__pmd, kmem_cache_t *kernel_pmd_cache, unsigned long flags)
+{
+ int i;
+ for (i=USER_PTRS_PER_PGD; i<PTRS_PER_PGD; i++) {
+ pmd_t *kern_pmd = (pmd_t *)pgd_page(swapper_pg_dir[i]);
+ memcpy(__pmd+PAGE_SIZE*(i-USER_PTRS_PER_PGD), kern_pmd, PAGE_SIZE);
+ }
+}
+
void pgd_ctor(void *__pgd, kmem_cache_t *pgd_cache, unsigned long flags)
{
pgd_t *pgd = __pgd;
@@ -190,14 +200,20 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
{
int i;
pgd_t *pgd = kmem_cache_alloc(pgd_cache, SLAB_KERNEL);
+ kmem_cache_t *pmd_cachep = pmd_cache;

if (PTRS_PER_PMD == 1)
return pgd;
else if (!pgd)
return NULL;

- for (i = 0; i < USER_PTRS_PER_PGD; ++i) {
- pmd_t *pmd = kmem_cache_alloc(pmd_cache, SLAB_KERNEL);
+ for (i = 0; i < PTRS_PER_PGD; ++i) {
+ pmd_t *pmd;
+
+ if (i >= USER_PTRS_PER_PGD)
+ pmd_cachep = kernel_pmd_cache;
+
+ pmd = kmem_cache_alloc(pmd_cachep, SLAB_KERNEL);
if (!pmd)
goto out_oom;
set_pgd(pgd + i, __pgd(1 + __pa((unsigned long long)((unsigned long)pmd))));
@@ -205,8 +221,10 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
return pgd;

out_oom:
- for (i--; i >= 0; --i)
- kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1));
+ for (i--; i >= 0; --i) {
+ pmd_t *pmd = pmd_offset(&pgd[i],0);
+ kmem_cache_free(pmd_cachep, pmd);
+ }
kmem_cache_free(pgd_cache, (void *)pgd);
return NULL;
}
@@ -216,8 +234,14 @@ void pgd_free(pgd_t *pgd)
int i;

if (PTRS_PER_PMD > 1) {
- for (i = 0; i < USER_PTRS_PER_PGD; ++i) {
- kmem_cache_free(pmd_cache, (void *)__va(pgd_val(pgd[i])-1));
+ for (i = 0; i < PTRS_PER_PGD; i++) {
+ pmd_t *pmd_to_free = pmd_offset(&pgd[i],0);
+
+ if( i >= USER_PTRS_PER_PGD )
+ kmem_cache_free(kernel_pmd_cache, pmd_to_free);
+ else
+ kmem_cache_free(pmd_cache, pmd_to_free);
+
set_pgd(pgd + i, __pgd(0));
}
}diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/arch/i386/Kconfig 650-banana_split/arch/i386/Kconfig
--- 640-per_node_idt/arch/i386/Kconfig Sun Apr 20 22:22:27 2003
+++ 650-banana_split/arch/i386/Kconfig Sun Apr 20 22:35:24 2003
@@ -687,7 +687,6 @@ choice

config 05GB
bool "3.5 GB"
- depends on !HIGHMEM64G

config 1GB
bool "3 GB"
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/arch/i386/mm/init.c 650-banana_split/arch/i386/mm/init.c
--- 640-per_node_idt/arch/i386/mm/init.c Sun Apr 20 22:22:15 2003
+++ 650-banana_split/arch/i386/mm/init.c Sun Apr 20 22:35:24 2003
@@ -123,6 +123,24 @@ static void __init page_table_range_init
}
}

+
+/*
+ * Abstract out using large pages when mapping KVA, or the SMP identity
+ * mapping
+ */
+void pmd_map_pfn_range(pmd_t* pmd_entry, unsigned long pfn, unsigned long max_pfn)
+{
+ int pte_ofs;
+ /* Map with big pages if possible, otherwise create normal page tables. */
+ if (cpu_has_pse) {
+ set_pmd(pmd_entry, pfn_pmd(pfn, PAGE_KERNEL_LARGE));
+ pfn += PTRS_PER_PTE;
+ } else {
+ pte_t* pte = one_page_table_init(pmd_entry);
+ for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_pfn; pte++, pfn++, pte_ofs++)
+ set_pte(pte, pfn_pte(pfn, PAGE_KERNEL));
+ }
+}
/*
* This maps the physical memory to kernel virtual address space, a total
* of max_low_pfn pages, by creating page tables starting from address
@@ -133,8 +151,7 @@ static void __init kernel_physical_mappi
unsigned long pfn;
pgd_t *pgd;
pmd_t *pmd;
- pte_t *pte;
- int pgd_idx, pmd_idx, pte_ofs;
+ int pgd_idx, pmd_idx;

pgd_idx = pgd_index(PAGE_OFFSET);
pgd = pgd_base + pgd_idx;
@@ -144,21 +161,48 @@ static void __init kernel_physical_mappi
pmd = one_md_table_init(pgd);
if (pfn >= max_low_pfn)
continue;
- for (pmd_idx = 0; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) {
- /* Map with big pages if possible, otherwise create normal page tables. */
- if (cpu_has_pse) {
- set_pmd(pmd, pfn_pmd(pfn, PAGE_KERNEL_LARGE));
- pfn += PTRS_PER_PTE;
- } else {
- pte = one_page_table_init(pmd);
-
- for (pte_ofs = 0; pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn; pte++, pfn++, pte_ofs++)
- set_pte(pte, pfn_pte(pfn, PAGE_KERNEL));
- }
+
+ /* beware of starting KVA in the middle of a pmd. */
+ if( pgd_idx == pgd_index(PAGE_OFFSET) ) {
+ pmd_idx = pmd_index(PAGE_OFFSET);
+ pmd = &pmd[pmd_idx];
+ } else
+ pmd_idx = 0;
+
+ for (; pmd_idx < PTRS_PER_PMD && pfn < max_low_pfn; pmd++, pmd_idx++) {
+ pmd_map_pfn_range(pmd, pfn, max_low_pfn);
+ pfn += PTRS_PER_PTE;
}
}
}

+/*
+ * Add low memory identity-mappings - SMP needs it when
+ * starting up on an AP from real-mode. In the non-PAE
+ * case we already have these mappings through head.S.
+ * All user-space mappings are explicitly cleared after
+ * SMP startup in zap_low_mappings().
+ */
+static void __init low_physical_mapping_init(pgd_t *pgd_base)
+{
+#if CONFIG_X86_PAE
+ unsigned long pfn = 0;
+ int pmd_ofs = 0;
+ pmd_t *pmd = one_md_table_init(pgd_base);
+
+ if(!cpu_has_pse) {
+ printk("PAE enabled, but no support for PSE (large pages)!\n");
+ printk("this is likely to waste some RAM.");
+ }
+
+ for (; pmd_ofs < PTRS_PER_PMD && pfn <= max_low_pfn; pmd++, pmd_ofs++) {
+ pmd_map_pfn_range(pmd, pfn, max_low_pfn);
+ pfn += PTRS_PER_PTE;
+ }
+#endif
+}
+
+
static inline int page_kills_ppro(unsigned long pagenr)
{
if (pagenr >= 0x70000 && pagenr <= 0x7003F)
@@ -225,7 +269,7 @@ void __init permanent_kmaps_init(pgd_t *
pgd = swapper_pg_dir + pgd_index(vaddr);
pmd = pmd_offset(pgd, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
- pkmap_page_table = pte;
+ pkmap_page_table = pte;
}

void __init one_highpage_init(struct page *page, int pfn, int bad_ppro)
@@ -290,6 +334,7 @@ static void __init pagetable_init (void)
}

kernel_physical_mapping_init(pgd_base);
+ low_physical_mapping_init(pgd_base);
remap_numa_kva();

/*
@@ -298,19 +343,7 @@ static void __init pagetable_init (void)
*/
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
page_table_range_init(vaddr, 0, pgd_base);
-
permanent_kmaps_init(pgd_base);
-
-#if CONFIG_X86_PAE
- /*
- * Add low memory identity-mappings - SMP needs it when
- * starting up on an AP from real-mode. In the non-PAE
- * case we already have these mappings through head.S.
- * All user-space mappings are explicitly cleared after
- * SMP startup.
- */
- pgd_base[0] = pgd_base[USER_PTRS_PER_PGD];
-#endif
}

void zap_low_mappings (void)
@@ -322,7 +355,7 @@ void zap_low_mappings (void)
* Note that "pgd_clear()" doesn't do it for
* us, because pgd_clear() is a no-op on i386.
*/
- for (i = 0; i < USER_PTRS_PER_PGD; i++)
+ for (i = 0; i < __USER_PTRS_PER_PGD; i++)
#if CONFIG_X86_PAE
set_pgd(swapper_pg_dir+i, __pgd(1 + __pa(empty_zero_page)));
#else
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/arch/i386/mm/pgtable.c 650-banana_split/arch/i386/mm/pgtable.c
--- 640-per_node_idt/arch/i386/mm/pgtable.c Sun Apr 20 22:22:15 2003
+++ 650-banana_split/arch/i386/mm/pgtable.c Sun Apr 20 22:35:24 2003
@@ -178,10 +178,22 @@ void pmd_ctor(void *__pmd, kmem_cache_t

void kernel_pmd_ctor(void *__pmd, kmem_cache_t *kernel_pmd_cache, unsigned long flags)
{
+ pmd_t *pmd = __pmd;
int i;
- for (i=USER_PTRS_PER_PGD; i<PTRS_PER_PGD; i++) {
+
+ /* you only need to memset the portion which isn't used by
+ * the kernel
+ */
+ clear_page(__pmd);
+
+ for (i=FIRST_KERNEL_PGD_PTR; i<PTRS_PER_PGD; i++, pmd+=PTRS_PER_PMD) {
pmd_t *kern_pmd = (pmd_t *)pgd_page(swapper_pg_dir[i]);
- memcpy(__pmd+PAGE_SIZE*(i-USER_PTRS_PER_PGD), kern_pmd, PAGE_SIZE);
+ int start_index = USER_PTRS_PER_PMD(i);
+ pmd_t *dst_pmd = &pmd[start_index];
+ pmd_t *src_pmd = &kern_pmd[start_index];
+ int num_pmds = PTRS_PER_PMD-USER_PTRS_PER_PMD(i);
+
+ memcpy(dst_pmd, src_pmd, num_pmds*sizeof(pmd_t));
}
}

@@ -200,30 +212,42 @@ pgd_t *pgd_alloc(struct mm_struct *mm)
{
int i;
pgd_t *pgd = kmem_cache_alloc(pgd_cache, SLAB_KERNEL);
- kmem_cache_t *pmd_cachep = pmd_cache;
+ pmd_t *kern_pmd_pages;

if (PTRS_PER_PMD == 1)
return pgd;
else if (!pgd)
return NULL;

- for (i = 0; i < PTRS_PER_PGD; ++i) {
+ for (i = 0; i < FIRST_KERNEL_PGD_PTR; ++i) {
pmd_t *pmd;
-
- if (i >= USER_PTRS_PER_PGD)
- pmd_cachep = kernel_pmd_cache;
-
- pmd = kmem_cache_alloc(pmd_cachep, SLAB_KERNEL);
+
+ pmd = kmem_cache_alloc(pmd_cache, SLAB_KERNEL);
if (!pmd)
goto out_oom;
set_pgd(pgd + i, __pgd(1 + __pa((unsigned long long)((unsigned long)pmd))));
}
+
+ /*
+ * The kernel pages are allocated in one big chunk, instead of having
+ * a different slab for each one.
+ */
+ kern_pmd_pages = kmem_cache_alloc(kernel_pmd_cache, SLAB_KERNEL);
+ if (!kern_pmd_pages)
+ goto out_oom;
+
+ for (i = FIRST_KERNEL_PGD_PTR; i < PTRS_PER_PGD; ++i) {
+ set_pgd(pgd + i, __pgd(1 + __pa((unsigned long long)((unsigned long)kern_pmd_pages))));
+ /* kern_pmd_pages += PAGE_SIZE, effectively */
+ kern_pmd_pages = &kern_pmd_pages[PTRS_PER_PMD];
+ }
+
return pgd;

out_oom:
for (i--; i >= 0; --i) {
pmd_t *pmd = pmd_offset(&pgd[i],0);
- kmem_cache_free(pmd_cachep, pmd);
+ kmem_cache_free(pmd_cache, pmd);
}
kmem_cache_free(pgd_cache, (void *)pgd);
return NULL;
@@ -232,19 +256,24 @@ out_oom:
void pgd_free(pgd_t *pgd)
{
int i;
-
+ pmd_t *pmd_to_free;
+
if (PTRS_PER_PMD > 1) {
- for (i = 0; i < PTRS_PER_PGD; i++) {
- pmd_t *pmd_to_free = pmd_offset(&pgd[i],0);
-
- if( i >= USER_PTRS_PER_PGD )
- kmem_cache_free(kernel_pmd_cache, pmd_to_free);
- else
- kmem_cache_free(pmd_cache, pmd_to_free);
-
+ for (i = 0; i < FIRST_KERNEL_PGD_PTR; i++) {
+ pmd_to_free = pmd_offset(&pgd[i],0);
+ kmem_cache_free(pmd_cache, pmd_to_free);
set_pgd(pgd + i, __pgd(0));
}
+
+ /*
+ * All of the kernel pmd pages are allocated from a single
+ * slab, as a unit. They must only be freed once
+ */
+ pmd_to_free = pmd_offset(&pgd[FIRST_KERNEL_PGD_PTR],0);
+ kmem_cache_free(kernel_pmd_cache, pmd_to_free);
+ for (i = FIRST_KERNEL_PGD_PTR; i < PTRS_PER_PGD; i++)
+ set_pgd(&pgd[i], __pgd(0));
}
-
+
kmem_cache_free(pgd_cache, (void *)pgd);
}
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-alpha/pgtable.h 650-banana_split/include/asm-alpha/pgtable.h
--- 640-per_node_idt/include/asm-alpha/pgtable.h Tue Apr 8 14:38:20 2003
+++ 650-banana_split/include/asm-alpha/pgtable.h Sun Apr 20 22:35:24 2003
@@ -39,6 +39,7 @@
#define PTRS_PER_PMD (1UL << (PAGE_SHIFT-3))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT-3))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

/* Number of pointers that fit on a page: this will go away. */
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-arm/pgtable.h 650-banana_split/include/asm-arm/pgtable.h
--- 640-per_node_idt/include/asm-arm/pgtable.h Mon Mar 17 21:43:48 2003
+++ 650-banana_split/include/asm-arm/pgtable.h Sun Apr 20 22:35:24 2003
@@ -45,6 +45,7 @@ extern void __pgd_error(const char *file

#define FIRST_USER_PGD_NR 1
#define USER_PTRS_PER_PGD ((TASK_SIZE/PGDIR_SIZE) - FIRST_USER_PGD_NR)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)

/*
* The table below defines the page protection levels that we insert into our
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-cris/pgtable.h 650-banana_split/include/asm-cris/pgtable.h
--- 640-per_node_idt/include/asm-cris/pgtable.h Sun Apr 20 19:35:05 2003
+++ 650-banana_split/include/asm-cris/pgtable.h Sun Apr 20 22:35:24 2003
@@ -202,6 +202,7 @@ static inline void flush_tlb(void)
*/

#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

/*
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-i386/pgtable.h 650-banana_split/include/asm-i386/pgtable.h
--- 640-per_node_idt/include/asm-i386/pgtable.h Sun Apr 20 22:14:44 2003
+++ 650-banana_split/include/asm-i386/pgtable.h Sun Apr 20 22:35:24 2003
@@ -55,7 +55,22 @@ void pgtable_cache_init(void);
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))

-#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define __USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define FIRST_KERNEL_PGD_PTR (__USER_PTRS_PER_PGD)
+#define PARTIAL_PGD (TASK_SIZE > __USER_PTRS_PER_PGD*PGDIR_SIZE ? 1 : 0)
+#define PARTIAL_PMD ((TASK_SIZE % PGDIR_SIZE)/PMD_SIZE)
+#define USER_PTRS_PER_PGD (PARTIAL_PGD + __USER_PTRS_PER_PGD)
+#ifndef __ASSEMBLY__
+static inline int USER_PTRS_PER_PMD(int pgd_index) {
+ if (pgd_index < __USER_PTRS_PER_PGD)
+ return PTRS_PER_PMD;
+ else if (PARTIAL_PMD && (pgd_index == __USER_PTRS_PER_PGD))
+ return (PTRS_PER_PMD-PARTIAL_PMD);
+ else
+ return 0;
+}
+#endif
+
#define FIRST_USER_PGD_NR 0

#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-ia64/pgtable.h 650-banana_split/include/asm-ia64/pgtable.h
--- 640-per_node_idt/include/asm-ia64/pgtable.h Sun Apr 20 19:35:05 2003
+++ 650-banana_split/include/asm-ia64/pgtable.h Sun Apr 20 22:35:24 2003
@@ -90,6 +90,7 @@
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PTRS_PER_PGD (__IA64_UL(1) << (PAGE_SHIFT-3))
#define USER_PTRS_PER_PGD (5*PTRS_PER_PGD/8) /* regions 0-4 are user regions */
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

/*
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-m68k/pgtable.h 650-banana_split/include/asm-m68k/pgtable.h
--- 640-per_node_idt/include/asm-m68k/pgtable.h Sun Nov 17 20:29:53 2002
+++ 650-banana_split/include/asm-m68k/pgtable.h Sun Apr 20 22:35:24 2003
@@ -58,6 +58,7 @@
#define PTRS_PER_PGD 128
#endif
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

/* Virtual address region for use by kernel_map() */
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-mips/pgtable.h 650-banana_split/include/asm-mips/pgtable.h
--- 640-per_node_idt/include/asm-mips/pgtable.h Sun Apr 20 19:35:05 2003
+++ 650-banana_split/include/asm-mips/pgtable.h Sun Apr 20 22:35:24 2003
@@ -95,6 +95,7 @@ extern int add_temporary_entry(unsigned
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 1024
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define VMALLOC_START KSEG2
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-mips64/pgtable.h 650-banana_split/include/asm-mips64/pgtable.h
--- 640-per_node_idt/include/asm-mips64/pgtable.h Sun Apr 20 22:15:36 2003
+++ 650-banana_split/include/asm-mips64/pgtable.h Sun Apr 20 22:35:24 2003
@@ -124,6 +124,7 @@ extern void (*_flush_cache_l1)(void);
#define PTRS_PER_PMD 1024
#define PTRS_PER_PTE 512
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define KPTBL_PAGE_ORDER 2
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-parisc/pgtable.h 650-banana_split/include/asm-parisc/pgtable.h
--- 640-per_node_idt/include/asm-parisc/pgtable.h Mon Mar 17 21:43:49 2003
+++ 650-banana_split/include/asm-parisc/pgtable.h Sun Apr 20 22:35:24 2003
@@ -81,6 +81,7 @@
#define PGDIR_MASK (~(PGDIR_SIZE-1))
#define PTRS_PER_PGD (1UL << (PAGE_SHIFT - PT_NLEVELS))
#define USER_PTRS_PER_PGD PTRS_PER_PGD
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)

/* Definitions for 2nd level */
#define pgtable_cache_init() do { } while (0)
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-ppc/pgtable.h 650-banana_split/include/asm-ppc/pgtable.h
--- 640-per_node_idt/include/asm-ppc/pgtable.h Tue Apr 8 14:38:20 2003
+++ 650-banana_split/include/asm-ppc/pgtable.h Sun Apr 20 22:35:24 2003
@@ -83,6 +83,7 @@ extern unsigned long ioremap_bot, iorema
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 1024
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-ppc64/pgtable.h 650-banana_split/include/asm-ppc64/pgtable.h
--- 640-per_node_idt/include/asm-ppc64/pgtable.h Wed Mar 26 22:54:37 2003
+++ 650-banana_split/include/asm-ppc64/pgtable.h Sun Apr 20 22:35:24 2003
@@ -36,6 +36,7 @@
#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)

#define USER_PTRS_PER_PGD (1024)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-sh/pgtable.h 650-banana_split/include/asm-sh/pgtable.h
--- 640-per_node_idt/include/asm-sh/pgtable.h Sun Apr 20 19:35:06 2003
+++ 650-banana_split/include/asm-sh/pgtable.h Sun Apr 20 22:35:48 2003
@@ -101,6 +101,7 @@ extern unsigned long empty_zero_page[102
#define PGDIR_MASK (~(PGDIR_SIZE-1))

#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define PTE_PHYS_MASK 0x1ffff000
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-sparc/pgtable.h 650-banana_split/include/asm-sparc/pgtable.h
--- 640-per_node_idt/include/asm-sparc/pgtable.h Sun Apr 20 19:35:07 2003
+++ 650-banana_split/include/asm-sparc/pgtable.h Sun Apr 20 22:35:48 2003
@@ -109,6 +109,7 @@ BTFIXUPDEF_INT(page_kernel)
#define PTRS_PER_PMD BTFIXUP_SIMM13(ptrs_per_pmd)
#define PTRS_PER_PGD BTFIXUP_SIMM13(ptrs_per_pgd)
#define USER_PTRS_PER_PGD BTFIXUP_SIMM13(user_ptrs_per_pgd)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define PAGE_NONE __pgprot(BTFIXUP_INT(page_none))
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-sparc64/pgtable.h 650-banana_split/include/asm-sparc64/pgtable.h
--- 640-per_node_idt/include/asm-sparc64/pgtable.h Wed Mar 26 22:54:37 2003
+++ 650-banana_split/include/asm-sparc64/pgtable.h Sun Apr 20 22:35:48 2003
@@ -93,6 +93,7 @@
/* Kernel has a separate 44bit address space. */
#define USER_PTRS_PER_PGD ((const int)(test_thread_flag(TIF_32BIT)) ? \
(1) : (PTRS_PER_PGD))
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define pte_ERROR(e) __builtin_trap()
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-um/pgtable.h 650-banana_split/include/asm-um/pgtable.h
--- 640-per_node_idt/include/asm-um/pgtable.h Mon Mar 17 21:43:49 2003
+++ 650-banana_split/include/asm-um/pgtable.h Sun Apr 20 22:35:48 2003
@@ -40,6 +40,7 @@ extern unsigned long *empty_zero_page;
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD 1024
#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define pte_ERROR(e) \
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/include/asm-x86_64/pgtable.h 650-banana_split/include/asm-x86_64/pgtable.h
--- 640-per_node_idt/include/asm-x86_64/pgtable.h Tue Apr 8 14:38:21 2003
+++ 650-banana_split/include/asm-x86_64/pgtable.h Sun Apr 20 22:35:48 2003
@@ -111,6 +111,7 @@ static inline void set_pml4(pml4_t *dst,
#define PGDIR_MASK (~(PGDIR_SIZE-1))

#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+#define USER_PTRS_PER_PMD(x) (PTRS_PER_PMD)
#define FIRST_USER_PGD_NR 0

#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
diff -urpN -X /home/fletch/.diff.exclude 640-per_node_idt/mm/memory.c 650-banana_split/mm/memory.c
--- 640-per_node_idt/mm/memory.c Sun Apr 20 21:24:43 2003
+++ 650-banana_split/mm/memory.c Sun Apr 20 22:35:48 2003
@@ -99,9 +99,10 @@ static inline void free_one_pmd(struct m
pte_free_tlb(tlb, page);
}

-static inline void free_one_pgd(struct mmu_gather *tlb, pgd_t * dir)
+static inline void free_one_pgd(struct mmu_gather *tlb, pgd_t * pgd, unsigned long pgdi)
{
pmd_t * pmd, * md, * emd;
+ pgd_t *dir = pgd + pgdi;

if (pgd_none(*dir))
return;
@@ -125,7 +126,7 @@ static inline void free_one_pgd(struct m
* found at 0x80000000 onwards. The loop below compiles instead
* to be terminated by unsigned address comparison using "jb".
*/
- for (md = pmd, emd = pmd + PTRS_PER_PMD; md < emd; md++)
+ for (md = pmd, emd = pmd + USER_PTRS_PER_PMD(pgdi); md < emd; md++)
free_one_pmd(tlb,md);
pmd_free_tlb(tlb, pmd);
}
@@ -139,11 +140,11 @@ static inline void free_one_pgd(struct m
void clear_page_tables(struct mmu_gather *tlb, unsigned long first, int nr)
{
pgd_t * page_dir = tlb->mm->pgd;
-
- page_dir += first;
+ int index = first;
+
do {
- free_one_pgd(tlb, page_dir);
- page_dir++;
+ free_one_pgd(tlb, page_dir, index);
+ index++;
} while (--nr);
}
\
 
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  Last update: 2005-03-22 13:35    [W:0.110 / U:0.064 seconds]
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