Dave,
This appears to work on ia64 with the attached patch. Could you
send me any test application you think would be helpful for me
to verify it is operating correctly? I could not get the PTSHARE_PUD
to compile. I put _NO_ effort into it. I found the following line
was invalid and quit trying.
> + spged = pgd_val(0);
Thanks,
Robin Holt
Index: linux-2.6/arch/ia64/Kconfig
===================================================================
--- linux-2.6.orig/arch/ia64/Kconfig 2006-01-14 07:16:46.149226872 -0600
+++ linux-2.6/arch/ia64/Kconfig 2006-01-14 07:25:02.228853432 -0600
@@ -289,6 +289,38 @@ source "mm/Kconfig"
config ARCH_SELECT_MEMORY_MODEL
def_bool y
+config PTSHARE
+ bool "Share page tables"
+ default y
+ help
+ Turn on sharing of page tables between processes for large shared
+ memory regions.
+
+menu "Page table levels to share"
+ depends on PTSHARE
+
+config PTSHARE_PTE
+ bool "Bottom level table (PTE)"
+ depends on PTSHARE
+ default y
+
+config PTSHARE_PMD
+ bool "Middle level table (PMD)"
+ depends on PTSHARE
+ default y
+
+config PTSHARE_PUD
+ bool "Upper level table (PUD)"
+ depends on PTSHARE && PGTABLE_4
+ default n
+
+endmenu
+
+config PTSHARE_HUGEPAGE
+ bool
+ depends on PTSHARE && PTSHARE_PMD
+ default y
+
config ARCH_DISCONTIGMEM_ENABLE
def_bool y
help
Index: linux-2.6/include/asm-ia64/pgtable.h
===================================================================
--- linux-2.6.orig/include/asm-ia64/pgtable.h 2006-01-14 09:49:47.628417563 -0600
+++ linux-2.6/include/asm-ia64/pgtable.h 2006-01-14 09:51:25.315194368 -0600
@@ -283,14 +283,16 @@ ia64_phys_addr_valid (unsigned long addr
#define pud_bad(pud) (!ia64_phys_addr_valid(pud_val(pud)))
#define pud_present(pud) (pud_val(pud) != 0UL)
#define pud_clear(pudp) (pud_val(*(pudp)) = 0UL)
-#define pud_page(pud) ((unsigned long) __va(pud_val(pud) & _PFN_MASK))
+#define pud_page_kernel(pud) ((unsigned long) __va(pud_val(pud) & _PFN_MASK))
+#define pud_page(pud) virt_to_page((pud_val(pud) + PAGE_OFFSET))
#ifdef CONFIG_PGTABLE_4
#define pgd_none(pgd) (!pgd_val(pgd))
#define pgd_bad(pgd) (!ia64_phys_addr_valid(pgd_val(pgd)))
#define pgd_present(pgd) (pgd_val(pgd) != 0UL)
#define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0UL)
-#define pgd_page(pgd) ((unsigned long) __va(pgd_val(pgd) & _PFN_MASK))
+#define pgd_page_kernel(pgd) ((unsigned long) __va(pgd_val(pgd) & _PFN_MASK))
+#define pgd_page(pgd) virt_to_page((pgd_val(pgd) + PAGE_OFFSET))
#endif
/*
@@ -363,12 +365,12 @@ pgd_offset (struct mm_struct *mm, unsign
#ifdef CONFIG_PGTABLE_4
/* Find an entry in the second-level page table.. */
#define pud_offset(dir,addr) \
- ((pud_t *) pgd_page(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
+ ((pud_t *) pgd_page_kernel(*(dir)) + (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1)))
#endif
/* Find an entry in the third-level page table.. */
#define pmd_offset(dir,addr) \
- ((pmd_t *) pud_page(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
+ ((pmd_t *) pud_page_kernel(*(dir)) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
/*
* Find an entry in the third-level page table. This looks more complicated than it
-
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