From e8351ac9bfa7f4412d5d196b6742309473ca506d Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Tue, 21 Jan 2014 15:49:52 -0800 Subject: mm/rmap: use rmap_walk() in try_to_munlock() Now, we have an infrastructure in rmap_walk() to handle difference from variants of rmap traversing functions. So, just use it in try_to_munlock(). In this patch, I change following things. 1. remove some variants of rmap traversing functions. cf> try_to_unmap_ksm, try_to_unmap_anon, try_to_unmap_file 2. mechanical change to use rmap_walk() in try_to_munlock(). 3. copy and paste comments. Signed-off-by: Joonsoo Kim Reviewed-by: Naoya Horiguchi Cc: Mel Gorman Cc: Hugh Dickins Cc: Rik van Riel Cc: Ingo Molnar Cc: Hillf Danton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/ksm.c | 50 -------------------------------------------------- 1 file changed, 50 deletions(-) (limited to 'mm/ksm.c') diff --git a/mm/ksm.c b/mm/ksm.c index 6b4baa97f4c0..646d45a6b6c8 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1946,56 +1946,6 @@ out: return referenced; } -int try_to_unmap_ksm(struct page *page, enum ttu_flags flags) -{ - struct stable_node *stable_node; - struct rmap_item *rmap_item; - int ret = SWAP_AGAIN; - int search_new_forks = 0; - - VM_BUG_ON(!PageKsm(page)); - VM_BUG_ON(!PageLocked(page)); - - stable_node = page_stable_node(page); - if (!stable_node) - return SWAP_FAIL; -again: - hlist_for_each_entry(rmap_item, &stable_node->hlist, hlist) { - struct anon_vma *anon_vma = rmap_item->anon_vma; - struct anon_vma_chain *vmac; - struct vm_area_struct *vma; - - anon_vma_lock_read(anon_vma); - anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, - 0, ULONG_MAX) { - vma = vmac->vma; - if (rmap_item->address < vma->vm_start || - rmap_item->address >= vma->vm_end) - continue; - /* - * Initially we examine only the vma which covers this - * rmap_item; but later, if there is still work to do, - * we examine covering vmas in other mms: in case they - * were forked from the original since ksmd passed. - */ - if ((rmap_item->mm == vma->vm_mm) == search_new_forks) - continue; - - ret = try_to_unmap_one(page, vma, - rmap_item->address, (void *)flags); - if (ret != SWAP_AGAIN || !page_mapped(page)) { - anon_vma_unlock_read(anon_vma); - goto out; - } - } - anon_vma_unlock_read(anon_vma); - } - if (!search_new_forks++) - goto again; -out: - return ret; -} - int rmap_walk_ksm(struct page *page, struct rmap_walk_control *rwc) { struct stable_node *stable_node; -- cgit v1.2.3