[PATCH v11 15/26] mm: introduce __lru_cache_add_active_or_unevictable
From: Laurent Dufour <hidden>
Date: 2018-05-17 11:10:33
Also in:
linuxppc-dev, lkml
Subsystem:
memory management, memory management - core, memory management - mglru (multi-gen lru), memory management - swap, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Chris Li, Kairui Song, Linus Torvalds
The speculative page fault handler which is run without holding the mmap_sem is calling lru_cache_add_active_or_unevictable() but the vm_flags is not guaranteed to remain constant. Introducing __lru_cache_add_active_or_unevictable() which has the vma flags value parameter instead of the vma pointer. Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Laurent Dufour <redacted> --- include/linux/swap.h | 10 ++++++++-- mm/memory.c | 8 ++++---- mm/swap.c | 6 +++--- 3 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/include/linux/swap.h b/include/linux/swap.h
index f73eafcaf4e9..730c14738574 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h@@ -338,8 +338,14 @@ extern void deactivate_file_page(struct page *page); extern void mark_page_lazyfree(struct page *page); extern void swap_setup(void); -extern void lru_cache_add_active_or_unevictable(struct page *page, - struct vm_area_struct *vma); +extern void __lru_cache_add_active_or_unevictable(struct page *page, + unsigned long vma_flags); + +static inline void lru_cache_add_active_or_unevictable(struct page *page, + struct vm_area_struct *vma) +{ + return __lru_cache_add_active_or_unevictable(page, vma->vm_flags); +} /* linux/mm/vmscan.c */ extern unsigned long zone_reclaimable_pages(struct zone *zone);
diff --git a/mm/memory.c b/mm/memory.c
index cb6310b74cfb..deac7f12d777 100644
--- a/mm/memory.c
+++ b/mm/memory.c@@ -2569,7 +2569,7 @@ static int wp_page_copy(struct vm_fault *vmf) ptep_clear_flush_notify(vma, vmf->address, vmf->pte); page_add_new_anon_rmap(new_page, vma, vmf->address, false); mem_cgroup_commit_charge(new_page, memcg, false, false); - lru_cache_add_active_or_unevictable(new_page, vma); + __lru_cache_add_active_or_unevictable(new_page, vmf->vma_flags); /* * We call the notify macro here because, when using secondary * mmu page tables (such as kvm shadow page tables), we want the
@@ -3105,7 +3105,7 @@ int do_swap_page(struct vm_fault *vmf) if (unlikely(page != swapcache && swapcache)) { page_add_new_anon_rmap(page, vma, vmf->address, false); mem_cgroup_commit_charge(page, memcg, false, false); - lru_cache_add_active_or_unevictable(page, vma); + __lru_cache_add_active_or_unevictable(page, vmf->vma_flags); } else { do_page_add_anon_rmap(page, vma, vmf->address, exclusive); mem_cgroup_commit_charge(page, memcg, true, false);
@@ -3256,7 +3256,7 @@ static int do_anonymous_page(struct vm_fault *vmf) inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES); page_add_new_anon_rmap(page, vma, vmf->address, false); mem_cgroup_commit_charge(page, memcg, false, false); - lru_cache_add_active_or_unevictable(page, vma); + __lru_cache_add_active_or_unevictable(page, vmf->vma_flags); setpte: set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry);
@@ -3510,7 +3510,7 @@ int alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg, inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES); page_add_new_anon_rmap(page, vma, vmf->address, false); mem_cgroup_commit_charge(page, memcg, false, false); - lru_cache_add_active_or_unevictable(page, vma); + __lru_cache_add_active_or_unevictable(page, vmf->vma_flags); } else { inc_mm_counter_fast(vma->vm_mm, mm_counter_file(page)); page_add_file_rmap(page, false);
diff --git a/mm/swap.c b/mm/swap.c
index 26fc9b5f1b6c..ba97d437e68a 100644
--- a/mm/swap.c
+++ b/mm/swap.c@@ -456,12 +456,12 @@ void lru_cache_add(struct page *page) * directly back onto it's zone's unevictable list, it does NOT use a * per cpu pagevec. */ -void lru_cache_add_active_or_unevictable(struct page *page, - struct vm_area_struct *vma) +void __lru_cache_add_active_or_unevictable(struct page *page, + unsigned long vma_flags) { VM_BUG_ON_PAGE(PageLRU(page), page); - if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) + if (likely((vma_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) SetPageActive(page); else if (!TestSetPageMlocked(page)) { /*
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2.7.4