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mm: introduce fault_env

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The idea borrowed from Peter's patch from patchset on speculative page
faults[1]:

Instead of passing around the endless list of function arguments,
replace the lot with a single structure so we can change context without
endless function signature changes.

The changes are mostly mechanical with exception of faultaround code:
filemap_map_pages() got reworked a bit.

This patch is preparation for the next one.

[1] http://lkml.kernel.org/r/20141020222841.302891540@infradead.org

Link: http://lkml.kernel.org/r/1466021202-61880-9-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2016-07-26 15:25:20 -07:00
committed by Linus Torvalds
parent dcddffd41d
commit bae473a423
10 changed files with 474 additions and 515 deletions
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28
mm/filemap.c
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@@ -2128,22 +2128,27 @@ page_not_uptodate:
}
EXPORT_SYMBOL(filemap_fault);
void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf)
void filemap_map_pages(struct fault_env *fe,
pgoff_t start_pgoff, pgoff_t end_pgoff)
{
struct radix_tree_iter iter;
void **slot;
struct file *file = vma->vm_file;
struct file *file = fe->vma->vm_file;
struct address_space *mapping = file->f_mapping;
pgoff_t last_pgoff = start_pgoff;
loff_t size;
struct page *page;
unsigned long address = (unsigned long) vmf->virtual_address;
unsigned long addr;
pte_t *pte;
rcu_read_lock();
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter, vmf->pgoff) {
if (iter.index > vmf->max_pgoff)
radix_tree_for_each_slot(slot, &mapping->page_tree, &iter,
start_pgoff) {
if (iter.index > end_pgoff)
break;
fe->pte += iter.index - last_pgoff;
fe->address += (iter.index - last_pgoff) << PAGE_SHIFT;
last_pgoff = iter.index;
if (!pte_none(*fe->pte))
goto next;
repeat:
page = radix_tree_deref_slot(slot);
if (unlikely(!page))
@@ -2179,14 +2184,9 @@ repeat:
if (page->index >= size >> PAGE_SHIFT)
goto unlock;
pte = vmf->pte + page->index - vmf->pgoff;
if (!pte_none(*pte))
goto unlock;
if (file->f_ra.mmap_miss > 0)
file->f_ra.mmap_miss--;
addr = address + (page->index - vmf->pgoff) * PAGE_SIZE;
do_set_pte(vma, addr, page, pte, false, false);
do_set_pte(fe, page);
unlock_page(page);
goto next;
unlock:
@@ -2194,7 +2194,7 @@ unlock:
skip:
put_page(page);
next:
if (iter.index == vmf->max_pgoff)
if (iter.index == end_pgoff)
break;
}
rcu_read_unlock();