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[PATCH] unpaged: VM_NONLINEAR VM_RESERVED

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There's one peculiar use of VM_RESERVED which the previous patch left behind:
because VM_NONLINEAR's try_to_unmap_cluster uses vm_private_data as a swapout
cursor, but should never meet VM_RESERVED vmas, it was a way of extending
VM_NONLINEAR to VM_RESERVED vmas using vm_private_data for some other purpose.
 But that's an empty set - they don't have the populate function required.  So
just throw away those VM_RESERVED tests.

But one more interesting in rmap.c has to go too: try_to_unmap_one will want
to swap out an anonymous page from VM_RESERVED or VM_UNPAGED area.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-11-21 21:32:16 -08:00 • committed by Linus Torvalds
parent 0b14c179a4
commit 101d2be764
2 changed files with 7 additions and 14 deletions
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6
mm/fremap.c
View file

@ -204,12 +204,10 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size,
* Make sure the vma is shared, that it supports prefaulting, * Make sure the vma is shared, that it supports prefaulting,
* and that the remapped range is valid and fully within * and that the remapped range is valid and fully within
* the single existing vma. vm_private_data is used as a * the single existing vma. vm_private_data is used as a
* swapout cursor in a VM_NONLINEAR vma (unless VM_RESERVED * swapout cursor in a VM_NONLINEAR vma.
* or VM_LOCKED, but VM_LOCKED could be revoked later on).
*/ */
if (vma && (vma->vm_flags & VM_SHARED) && if (vma && (vma->vm_flags & VM_SHARED) &&
(!vma->vm_private_data || (!vma->vm_private_data || (vma->vm_flags & VM_NONLINEAR)) &&
(vma->vm_flags & (VM_NONLINEAR|VM_RESERVED))) &&
vma->vm_ops && vma->vm_ops->populate && vma->vm_ops && vma->vm_ops->populate &&
end > start && start >= vma->vm_start && end > start && start >= vma->vm_start &&
end <= vma->vm_end) { end <= vma->vm_end) {

15
mm/rmap.c
View file

@ -529,10 +529,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma)
* If the page is mlock()d, we cannot swap it out. * If the page is mlock()d, we cannot swap it out.
* If it's recently referenced (perhaps page_referenced * If it's recently referenced (perhaps page_referenced
* skipped over this mm) then we should reactivate it. * skipped over this mm) then we should reactivate it.
*
* Pages belonging to VM_RESERVED regions should not happen here.
*/ */
if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) || if ((vma->vm_flags & VM_LOCKED) ||
ptep_clear_flush_young(vma, address, pte)) { ptep_clear_flush_young(vma, address, pte)) {
ret = SWAP_FAIL; ret = SWAP_FAIL;
goto out_unmap; goto out_unmap;
@ -727,7 +725,7 @@ static int try_to_unmap_file(struct page *page)
list_for_each_entry(vma, &mapping->i_mmap_nonlinear, list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
shared.vm_set.list) { shared.vm_set.list) {
if (vma->vm_flags & (VM_LOCKED|VM_RESERVED)) if (vma->vm_flags & VM_LOCKED)
continue; continue;
cursor = (unsigned long) vma->vm_private_data; cursor = (unsigned long) vma->vm_private_data;
if (cursor > max_nl_cursor) if (cursor > max_nl_cursor)
@ -761,7 +759,7 @@ static int try_to_unmap_file(struct page *page)
do { do {
list_for_each_entry(vma, &mapping->i_mmap_nonlinear, list_for_each_entry(vma, &mapping->i_mmap_nonlinear,
shared.vm_set.list) { shared.vm_set.list) {
if (vma->vm_flags & (VM_LOCKED|VM_RESERVED)) if (vma->vm_flags & VM_LOCKED)
continue; continue;
cursor = (unsigned long) vma->vm_private_data; cursor = (unsigned long) vma->vm_private_data;
while ( cursor < max_nl_cursor && while ( cursor < max_nl_cursor &&
@ -783,11 +781,8 @@ static int try_to_unmap_file(struct page *page)
* in locked vmas). Reset cursor on all unreserved nonlinear * in locked vmas). Reset cursor on all unreserved nonlinear
* vmas, now forgetting on which ones it had fallen behind. * vmas, now forgetting on which ones it had fallen behind.
*/ */
list_for_each_entry(vma, &mapping->i_mmap_nonlinear, list_for_each_entry(vma, &mapping->i_mmap_nonlinear, shared.vm_set.list)
shared.vm_set.list) { vma->vm_private_data = NULL;
if (!(vma->vm_flags & VM_RESERVED))
vma->vm_private_data = NULL;
}
out: out:
spin_unlock(&mapping->i_mmap_lock); spin_unlock(&mapping->i_mmap_lock);
return ret; return ret;