[PATCH] Hugepage consolidation

A lot of the code in arch/*/mm/hugetlbpage.c is quite similar.  This patch
attempts to consolidate a lot of the code across the arch's, putting the
combined version in mm/hugetlb.c.  There are a couple of uglyish hacks in
order to covert all the hugepage archs, but the result is a very large
reduction in the total amount of code.  It also means things like hugepage
lazy allocation could be implemented in one place, instead of six.

Tested, at least a little, on ppc64, i386 and x86_64.

Notes:
	- this patch changes the meaning of set_huge_pte() to be more
	  analagous to set_pte()
	- does SH4 need s special huge_ptep_get_and_clear()??

Acked-by: William Lee Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 24 insertions, 172 deletions

diff --git a/arch/sh/mm/hugetlbpage.c b/arch/sh/mm/hugetlbpage.c
index 1f897bab2318..95bb1a6c6060 100644
--- a/arch/sh/mm/hugetlbpage.c
+++ b/arch/sh/mm/hugetlbpage.c
@@ -24,7 +24,7 @@
 #include <asm/tlbflush.h>
 #include <asm/cacheflush.h>
 
-static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
+pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
 {
         pgd_t *pgd;
         pmd_t *pmd;
@@ -39,7 +39,7 @@ static pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
         return pte;
 }
 
-static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
+pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
 {
         pgd_t *pgd;
         pmd_t *pmd;
@@ -56,28 +56,34 @@ static pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
 
 #define mk_pte_huge(entry) do { pte_val(entry) |= _PAGE_SZHUGE; } while (0)
 
-static void set_huge_pte(struct mm_struct *mm, struct vm_area_struct *vma,
-                         struct page *page, pte_t * page_table, int write_access)
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
+                     pte_t *ptep, pte_t entry)
 {
-        unsigned long i;
-        pte_t entry;
+        int i;
 
-        add_mm_counter(mm, rss, HPAGE_SIZE / PAGE_SIZE);
+        for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+                set_pte_at(mm, addr, ptep, entry);
+                ptep++;
+                addr += PAGE_SIZE;
+                pte_val(entry) += PAGE_SIZE;
+        }
+}
 
-        if (write_access)
-                entry = pte_mkwrite(pte_mkdirty(mk_pte(page,
-                                                       vma->vm_page_prot)));
-        else
-                entry = pte_wrprotect(mk_pte(page, vma->vm_page_prot));
-        entry = pte_mkyoung(entry);
-        mk_pte_huge(entry);
+pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
+                              pte_t *ptep)
+{
+        pte_t entry;
+        int i;
 
-        for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
-                set_pte(page_table, entry);
-                page_table++;
+        entry = *ptep;
 
-                pte_val(entry) += PAGE_SIZE;
+        for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
+                pte_clear(mm, addr, ptep);
+                addr += PAGE_SIZE;
+                ptep++;
         }
+
+        return entry;
 }
 
 /*
@@ -92,79 +98,6 @@ int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
         return 0;
 }
 
-int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src,
-                            struct vm_area_struct *vma)
-{
-        pte_t *src_pte, *dst_pte, entry;
-        struct page *ptepage;
-        unsigned long addr = vma->vm_start;
-        unsigned long end = vma->vm_end;
-        int i;
-
-        while (addr < end) {
-                dst_pte = huge_pte_alloc(dst, addr);
-                if (!dst_pte)
-                        goto nomem;
-                src_pte = huge_pte_offset(src, addr);
-                BUG_ON(!src_pte || pte_none(*src_pte));
-                entry = *src_pte;
-                ptepage = pte_page(entry);
-                get_page(ptepage);
-                for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
-                        set_pte(dst_pte, entry);
-                        pte_val(entry) += PAGE_SIZE;
-                        dst_pte++;
-                }
-                add_mm_counter(dst, rss, HPAGE_SIZE / PAGE_SIZE);
-                addr += HPAGE_SIZE;
-        }
-        return 0;
-
-nomem:
-        return -ENOMEM;
-}
-
-int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
-                        struct page **pages, struct vm_area_struct **vmas,
-                        unsigned long *position, int *length, int i)
-{
-        unsigned long vaddr = *position;
-        int remainder = *length;
-
-        WARN_ON(!is_vm_hugetlb_page(vma));
-
-        while (vaddr < vma->vm_end && remainder) {
-                if (pages) {
-                        pte_t *pte;
-                        struct page *page;
-
-                        pte = huge_pte_offset(mm, vaddr);
-
-                        /* hugetlb should be locked, and hence, prefaulted */
-                        BUG_ON(!pte || pte_none(*pte));
-
-                        page = pte_page(*pte);
-
-                        WARN_ON(!PageCompound(page));
-
-                        get_page(page);
-                        pages[i] = page;
-                }
-
-                if (vmas)
-                        vmas[i] = vma;
-
-                vaddr += PAGE_SIZE;
-                --remainder;
-                ++i;
-        }
-
-        *length = remainder;
-        *position = vaddr;
-
-        return i;
-}
-
 struct page *follow_huge_addr(struct mm_struct *mm,
                               unsigned long address, int write)
 {
@@ -181,84 +114,3 @@ struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
 {
         return NULL;
 }
-
-void unmap_hugepage_range(struct vm_area_struct *vma,
-                          unsigned long start, unsigned long end)
-{
-        struct mm_struct *mm = vma->vm_mm;
-        unsigned long address;
-        pte_t *pte;
-        struct page *page;
-        int i;
-
-        BUG_ON(start & (HPAGE_SIZE - 1));
-        BUG_ON(end & (HPAGE_SIZE - 1));
-
-        for (address = start; address < end; address += HPAGE_SIZE) {
-                pte = huge_pte_offset(mm, address);
-                BUG_ON(!pte);
-                if (pte_none(*pte))
-                        continue;
-                page = pte_page(*pte);
-                put_page(page);
-                for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
-                        pte_clear(mm, address+(i*PAGE_SIZE), pte);
-                        pte++;
-                }
-        }
-        add_mm_counter(mm, rss, -((end - start) >> PAGE_SHIFT));
-        flush_tlb_range(vma, start, end);
-}
-
-int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
-{
-        struct mm_struct *mm = current->mm;
-        unsigned long addr;
-        int ret = 0;
-
-        BUG_ON(vma->vm_start & ~HPAGE_MASK);
-        BUG_ON(vma->vm_end & ~HPAGE_MASK);
-
-        spin_lock(&mm->page_table_lock);
-        for (addr = vma->vm_start; addr < vma->vm_end; addr += HPAGE_SIZE) {
-                unsigned long idx;
-                pte_t *pte = huge_pte_alloc(mm, addr);
-                struct page *page;
-
-                if (!pte) {
-                        ret = -ENOMEM;
-                        goto out;
-                }
-                if (!pte_none(*pte))
-                        continue;
-
-                idx = ((addr - vma->vm_start) >> HPAGE_SHIFT)
-                        + (vma->vm_pgoff >> (HPAGE_SHIFT - PAGE_SHIFT));
-                page = find_get_page(mapping, idx);
-                if (!page) {
-                        /* charge the fs quota first */
-                        if (hugetlb_get_quota(mapping)) {
-                                ret = -ENOMEM;
-                                goto out;
-                        }
-                        page = alloc_huge_page();
-                        if (!page) {
-                                hugetlb_put_quota(mapping);
-                                ret = -ENOMEM;
-                                goto out;
-                        }
-                        ret = add_to_page_cache(page, mapping, idx, GFP_ATOMIC);
-                        if (! ret) {
-                                unlock_page(page);
-                        } else {
-                                hugetlb_put_quota(mapping);
-                                free_huge_page(page);
-                                goto out;
-                        }
-                }
-                set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
-        }
-out:
-        spin_unlock(&mm->page_table_lock);
-        return ret;
-}