From 0b14c179a483e71ea41df2aa4a661760063115bd Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Mon, 21 Nov 2005 21:32:15 -0800 Subject: [PATCH] unpaged: VM_UNPAGED Although we tend to associate VM_RESERVED with remap_pfn_range, quite a few drivers set VM_RESERVED on areas which are then populated by nopage. The PageReserved removal in 2.6.15-rc1 changed VM_RESERVED not to free pages in zap_pte_range, without changing those drivers not to set it: so their pages just leak away. Let's not change miscellaneous drivers now: introduce VM_UNPAGED at the core, to flag the special areas where the ptes may have no struct page, or if they have then it's not to be touched. Replace most instances of VM_RESERVED in core mm by VM_UNPAGED. Force it on in remap_pfn_range, and the sparc and sparc64 io_remap_pfn_range. Revert addition of VM_RESERVED to powerpc vdso, it's not needed there. Is it needed anywhere? It still governs the mm->reserved_vm statistic, and special vmas not to be merged, and areas not to be core dumped; but could probably be eliminated later (the drivers are probably specifying it because in 2.4 it kept swapout off the vma, but in 2.6 we work from the LRU, which these pages don't get on). Use the VM_SHM slot for VM_UNPAGED, and define VM_SHM to 0: it serves no purpose whatsoever, and should be removed from drivers when we clean up. Signed-off-by: Hugh Dickins Acked-by: William Irwin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/msync.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'mm/msync.c') diff --git a/mm/msync.c b/mm/msync.c index 0e040e9c39d..b3f4caf3010 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -97,9 +97,9 @@ static void msync_page_range(struct vm_area_struct *vma, /* For hugepages we can't go walking the page table normally, * but that's ok, hugetlbfs is memory based, so we don't need * to do anything more on an msync(). - * Can't do anything with VM_RESERVED regions either. + * Can't do anything with VM_UNPAGED regions either. */ - if (vma->vm_flags & (VM_HUGETLB|VM_RESERVED)) + if (vma->vm_flags & (VM_HUGETLB|VM_UNPAGED)) return; BUG_ON(addr >= end); -- cgit v1.2.3 From 6aab341e0a28aff100a09831c5300a2994b8b986 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 28 Nov 2005 14:34:23 -0800 Subject: mm: re-architect the VM_UNPAGED logic This replaces the (in my opinion horrible) VM_UNMAPPED logic with very explicit support for a "remapped page range" aka VM_PFNMAP. It allows a VM area to contain an arbitrary range of page table entries that the VM never touches, and never considers to be normal pages. Any user of "remap_pfn_range()" automatically gets this new functionality, and doesn't even have to mark the pages reserved or indeed mark them any other way. It just works. As a side effect, doing mmap() on /dev/mem works for arbitrary ranges. Sparc update from David in the next commit. Signed-off-by: Linus Torvalds --- mm/msync.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'mm/msync.c') diff --git a/mm/msync.c b/mm/msync.c index b3f4caf3010..1b5b6f662dc 100644 --- a/mm/msync.c +++ b/mm/msync.c @@ -27,7 +27,6 @@ static void msync_pte_range(struct vm_area_struct *vma, pmd_t *pmd, again: pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); do { - unsigned long pfn; struct page *page; if (progress >= 64) { @@ -40,13 +39,9 @@ again: continue; if (!pte_maybe_dirty(*pte)) continue; - pfn = pte_pfn(*pte); - if (unlikely(!pfn_valid(pfn))) { - print_bad_pte(vma, *pte, addr); + page = vm_normal_page(vma, addr, *pte); + if (!page) continue; - } - page = pfn_to_page(pfn); - if (ptep_clear_flush_dirty(vma, addr, pte) || page_test_and_clear_dirty(page)) set_page_dirty(page); @@ -97,9 +92,8 @@ static void msync_page_range(struct vm_area_struct *vma, /* For hugepages we can't go walking the page table normally, * but that's ok, hugetlbfs is memory based, so we don't need * to do anything more on an msync(). - * Can't do anything with VM_UNPAGED regions either. */ - if (vma->vm_flags & (VM_HUGETLB|VM_UNPAGED)) + if (vma->vm_flags & VM_HUGETLB) return; BUG_ON(addr >= end); -- cgit v1.2.3