patch-2.4.25 linux-2.4.25/arch/ia64/mm/hugetlbpage.c
Next file: linux-2.4.25/arch/ia64/mm/init.c
Previous file: linux-2.4.25/arch/ia64/mm/Makefile
Back to the patch index
Back to the overall index
- Lines: 514
- Date:
2004-02-18 05:36:30.000000000 -0800
- Orig file:
linux-2.4.24/arch/ia64/mm/hugetlbpage.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/arch/ia64/mm/hugetlbpage.c linux-2.4.25/arch/ia64/mm/hugetlbpage.c
@@ -0,0 +1,513 @@
+/*
+ * IA-64 Huge TLB Page Support for Kernel.
+ *
+ * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/hugetlb.h>
+#include <linux/pagemap.h>
+#include <linux/smp_lock.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <asm/mman.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+
+#define TASK_HPAGE_BASE (REGION_HPAGE << REGION_SHIFT)
+
+static long htlbpagemem;
+int htlbpage_max;
+static long htlbzone_pages;
+
+struct vm_operations_struct hugetlb_vm_ops;
+static LIST_HEAD(htlbpage_freelist);
+static spinlock_t htlbpage_lock = SPIN_LOCK_UNLOCKED;
+
+static struct page *alloc_hugetlb_page(void)
+{
+ int i;
+ struct page *page;
+
+ spin_lock(&htlbpage_lock);
+ if (list_empty(&htlbpage_freelist)) {
+ spin_unlock(&htlbpage_lock);
+ return NULL;
+ }
+
+ page = list_entry(htlbpage_freelist.next, struct page, list);
+ list_del(&page->list);
+ htlbpagemem--;
+ spin_unlock(&htlbpage_lock);
+ set_page_count(page, 1);
+ for (i = 0; i < (HPAGE_SIZE/PAGE_SIZE); ++i)
+ clear_highpage(&page[i]);
+ return page;
+}
+
+static pte_t *
+huge_pte_alloc (struct mm_struct *mm, unsigned long addr)
+{
+ unsigned long taddr = htlbpage_to_page(addr);
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ pgd = pgd_offset(mm, taddr);
+ pmd = pmd_alloc(mm, pgd, taddr);
+ if (pmd)
+ pte = pte_alloc(mm, pmd, taddr);
+ return pte;
+}
+
+static pte_t *
+huge_pte_offset (struct mm_struct *mm, unsigned long addr)
+{
+ unsigned long taddr = htlbpage_to_page(addr);
+ pgd_t *pgd;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+
+ pgd = pgd_offset(mm, taddr);
+ pmd = pmd_offset(pgd, taddr);
+ pte = pte_offset(pmd, taddr);
+ return pte;
+}
+
+#define mk_pte_huge(entry) { pte_val(entry) |= _PAGE_P; }
+
+static void
+set_huge_pte (struct mm_struct *mm, struct vm_area_struct *vma,
+ struct page *page, pte_t * page_table, int write_access)
+{
+ pte_t entry;
+
+ mm->rss += (HPAGE_SIZE / 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);
+ set_pte(page_table, entry);
+ return;
+}
+/*
+ * This function checks for proper alignment of input addr and len parameters.
+ */
+int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
+{
+ if (len & ~HPAGE_MASK)
+ return -EINVAL;
+ if (addr & ~HPAGE_MASK)
+ return -EINVAL;
+ if (REGION_NUMBER(addr) != REGION_HPAGE)
+ return -EINVAL;
+
+ return 0;
+}
+/* This function checks if the address and address+len falls out of HugeTLB region. It
+ * return -EINVAL if any part of address range falls in HugeTLB region.
+ */
+int is_invalid_hugepage_range(unsigned long addr, unsigned long len)
+{
+ if (REGION_NUMBER(addr) == REGION_HPAGE)
+ return -EINVAL;
+ if (REGION_NUMBER(addr+len) == REGION_HPAGE)
+ return -EINVAL;
+ return 0;
+}
+
+/*
+ * Same as generic free_pgtables(), except constant PGDIR_* and pgd_offset
+ * are hugetlb region specific.
+ */
+void hugetlb_free_pgtables(struct mm_struct * mm, struct vm_area_struct *prev,
+ unsigned long start, unsigned long end)
+{
+ unsigned long first = start & HUGETLB_PGDIR_MASK;
+ unsigned long last = end + HUGETLB_PGDIR_SIZE - 1;
+ unsigned long start_index, end_index;
+
+ if (!prev) {
+ prev = mm->mmap;
+ if (!prev)
+ goto no_mmaps;
+ if (prev->vm_end > start) {
+ if (last > prev->vm_start)
+ last = prev->vm_start;
+ goto no_mmaps;
+ }
+ }
+ for (;;) {
+ struct vm_area_struct *next = prev->vm_next;
+
+ if (next) {
+ if (next->vm_start < start) {
+ prev = next;
+ continue;
+ }
+ if (last > next->vm_start)
+ last = next->vm_start;
+ }
+ if (prev->vm_end > first)
+ first = prev->vm_end + HUGETLB_PGDIR_SIZE - 1;
+ break;
+ }
+no_mmaps:
+ if (last < first)
+ return;
+ /*
+ * If the PGD bits are not consecutive in the virtual address, the
+ * old method of shifting the VA >> by PGDIR_SHIFT doesn't work.
+ */
+ start_index = pgd_index(htlbpage_to_page(first));
+ end_index = pgd_index(htlbpage_to_page(last));
+ if (end_index > start_index) {
+ clear_page_tables(mm, start_index, end_index - start_index);
+ flush_tlb_pgtables(mm, first & HUGETLB_PGDIR_MASK,
+ last & HUGETLB_PGDIR_MASK);
+ }
+}
+
+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;
+
+ while (addr < end) {
+ dst_pte = huge_pte_alloc(dst, addr);
+ if (!dst_pte)
+ goto nomem;
+ src_pte = huge_pte_offset(src, addr);
+ entry = *src_pte;
+ ptepage = pte_page(entry);
+ get_page(ptepage);
+ set_pte(dst_pte, entry);
+ 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 *st, int *length, int i)
+{
+ pte_t *ptep, pte;
+ unsigned long start = *st;
+ unsigned long pstart;
+ int len = *length;
+ struct page *page;
+
+ do {
+ pstart = start;
+ ptep = huge_pte_offset(mm, start);
+ pte = *ptep;
+
+back1:
+ page = pte_page(pte);
+ if (pages) {
+ page += ((start & ~HPAGE_MASK) >> PAGE_SHIFT);
+ pages[i] = page;
+ }
+ if (vmas)
+ vmas[i] = vma;
+ i++;
+ len--;
+ start += PAGE_SIZE;
+ if (((start & HPAGE_MASK) == pstart) && len &&
+ (start < vma->vm_end))
+ goto back1;
+ } while (len && start < vma->vm_end);
+ *length = len;
+ *st = start;
+ return i;
+}
+
+void free_huge_page(struct page *page)
+{
+ BUG_ON(page_count(page));
+ BUG_ON(page->mapping);
+
+ INIT_LIST_HEAD(&page->list);
+
+ spin_lock(&htlbpage_lock);
+ list_add(&page->list, &htlbpage_freelist);
+ htlbpagemem++;
+ spin_unlock(&htlbpage_lock);
+}
+
+void huge_page_release(struct page *page)
+{
+ if (!put_page_testzero(page))
+ return;
+
+ free_huge_page(page);
+}
+
+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;
+
+ 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);
+ if (pte_none(*pte))
+ continue;
+ page = pte_page(*pte);
+ huge_page_release(page);
+ pte_clear(pte);
+ }
+ mm->rss -= (end - start) >> PAGE_SHIFT;
+ flush_tlb_range(mm, start, end);
+}
+
+void zap_hugepage_range(struct vm_area_struct *vma, unsigned long start, unsigned long length)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ spin_lock(&mm->page_table_lock);
+ unmap_hugepage_range(vma, start, start + length);
+ spin_unlock(&mm->page_table_lock);
+}
+
+int hugetlb_prefault(struct address_space *mapping, struct vm_area_struct *vma)
+{
+ struct mm_struct *mm = current->mm;
+ struct inode *inode = mapping->host;
+ 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_hugetlb_page();
+ if (!page) {
+ hugetlb_put_quota(mapping);
+ ret = -ENOMEM;
+ goto out;
+ }
+ add_to_page_cache(page, mapping, idx);
+ unlock_page(page);
+ }
+ set_huge_pte(mm, vma, page, pte, vma->vm_flags & VM_WRITE);
+ }
+out:
+ spin_unlock(&mm->page_table_lock);
+ return ret;
+}
+
+unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
+ unsigned long pgoff, unsigned long flags)
+{
+ struct vm_area_struct *vmm;
+
+ if (len > RGN_MAP_LIMIT)
+ return -ENOMEM;
+ if (len & ~HPAGE_MASK)
+ return -EINVAL;
+ /* This code assumes that REGION_HPAGE != 0. */
+ if ((REGION_NUMBER(addr) != REGION_HPAGE) || (addr & (HPAGE_SIZE - 1)))
+ addr = TASK_HPAGE_BASE;
+ else
+ addr = COLOR_HALIGN(addr);
+ for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
+ /* At this point: (!vmm || addr < vmm->vm_end). */
+ if (REGION_OFFSET(addr) + len > RGN_MAP_LIMIT)
+ return -ENOMEM;
+ if (!vmm || (addr + len) <= vmm->vm_start)
+ return addr;
+ addr = COLOR_HALIGN(vmm->vm_end);
+ }
+}
+void update_and_free_page(struct page *page)
+{
+ int j;
+ struct page *map;
+
+ map = page;
+ htlbzone_pages--;
+ for (j = 0; j < (HPAGE_SIZE / PAGE_SIZE); j++) {
+ map->flags &= ~(1 << PG_locked | 1 << PG_error | 1 << PG_referenced |
+ 1 << PG_dirty | 1 << PG_active | 1 << PG_reserved);
+ set_page_count(map, 0);
+ map++;
+ }
+ set_page_count(page, 1);
+ __free_pages(page, HUGETLB_PAGE_ORDER);
+}
+
+int try_to_free_low(int count)
+{
+ struct list_head *p;
+ struct page *page, *map;
+
+ map = NULL;
+ spin_lock(&htlbpage_lock);
+ list_for_each(p, &htlbpage_freelist) {
+ if (map) {
+ list_del(&map->list);
+ update_and_free_page(map);
+ htlbpagemem--;
+ map = NULL;
+ if (++count == 0)
+ break;
+ }
+ page = list_entry(p, struct page, list);
+ if ((page_zone(page))->name[0] != 'H') //Look for non-Highmem zones.
+ map = page;
+ }
+ if (map) {
+ list_del(&map->list);
+ update_and_free_page(map);
+ htlbpagemem--;
+ count++;
+ }
+ spin_unlock(&htlbpage_lock);
+ return count;
+}
+
+int set_hugetlb_mem_size(int count)
+{
+ int j, lcount;
+ struct page *page, *map;
+
+ if (count < 0)
+ lcount = count;
+ else
+ lcount = count - htlbzone_pages;
+
+ if (lcount == 0)
+ return (int)htlbzone_pages;
+ if (lcount > 0) { /* Increase the mem size. */
+ while (lcount--) {
+ page = alloc_pages(__GFP_HIGHMEM, HUGETLB_PAGE_ORDER);
+ if (page == NULL)
+ break;
+ map = page;
+ for (j = 0; j < (HPAGE_SIZE / PAGE_SIZE); j++) {
+ SetPageReserved(map);
+ map++;
+ }
+ spin_lock(&htlbpage_lock);
+ list_add(&page->list, &htlbpage_freelist);
+ htlbpagemem++;
+ htlbzone_pages++;
+ spin_unlock(&htlbpage_lock);
+ }
+ return (int) htlbzone_pages;
+ }
+ /* Shrink the memory size. */
+ lcount = try_to_free_low(lcount);
+ while (lcount++ < 0) {
+ page = alloc_hugetlb_page();
+ if (page == NULL)
+ break;
+ spin_lock(&htlbpage_lock);
+ update_and_free_page(page);
+ spin_unlock(&htlbpage_lock);
+ }
+ return (int) htlbzone_pages;
+}
+
+int hugetlb_sysctl_handler(ctl_table *table, int write, struct file *file, void *buffer, size_t *length)
+{
+ proc_dointvec(table, write, file, buffer, length);
+ htlbpage_max = set_hugetlb_mem_size(htlbpage_max);
+ return 0;
+}
+
+static int __init hugetlb_setup(char *s)
+{
+ if (sscanf(s, "%d", &htlbpage_max) <= 0)
+ htlbpage_max = 0;
+ return 1;
+}
+__setup("hugepages=", hugetlb_setup);
+
+static int __init hugetlb_init(void)
+{
+ int i, j;
+ struct page *page;
+
+ for (i = 0; i < htlbpage_max; ++i) {
+ page = alloc_pages(__GFP_HIGHMEM, HUGETLB_PAGE_ORDER);
+ if (!page)
+ break;
+ for (j = 0; j < HPAGE_SIZE/PAGE_SIZE; ++j)
+ SetPageReserved(&page[j]);
+ spin_lock(&htlbpage_lock);
+ list_add(&page->list, &htlbpage_freelist);
+ spin_unlock(&htlbpage_lock);
+ }
+ htlbpage_max = htlbpagemem = htlbzone_pages = i;
+ printk("Total HugeTLB memory allocated, %ld\n", htlbpagemem);
+ return 0;
+}
+module_init(hugetlb_init);
+
+int hugetlb_report_meminfo(char *buf)
+{
+ return sprintf(buf,
+ "HugePages_Total: %5lu\n"
+ "HugePages_Free: %5lu\n"
+ "Hugepagesize: %5lu kB\n",
+ htlbzone_pages,
+ htlbpagemem,
+ HPAGE_SIZE/1024);
+}
+
+int is_hugepage_mem_enough(size_t size)
+{
+ if (size > (htlbpagemem << HPAGE_SHIFT))
+ return 0;
+ return 1;
+}
+
+static struct page *hugetlb_nopage(struct vm_area_struct * area, unsigned long address, int unused)
+{
+ BUG();
+ return NULL;
+}
+
+struct vm_operations_struct hugetlb_vm_ops = {
+ .nopage = hugetlb_nopage,
+};
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)