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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	Will Deacon <will@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux-MM <linux-mm@kvack.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Jan Kara <jack@suse.cz>, Minchan Kim <minchan@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Vinayak Menon <vinmenon@codeaurora.org>,
	Android Kernel Team <kernel-team@android.com>
Subject: Re: [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting
Date: Mon, 14 Dec 2020 19:07:24 +0300
Message-ID: <20201214160724.ewhjqoi32chheone@box> (raw)
In-Reply-To: <CAHk-=wiU8ktvak2hCj2TWJ6wMSwVsUSvi5Bjf4i1JGvpGmyUZw@mail.gmail.com>

On Thu, Dec 10, 2020 at 09:23:53AM -0800, Linus Torvalds wrote:
> Can we please move that part to the callers too - possibly with a
> separate helper function?

Here it is. Still barely tested.

I expected to hate it more, but it looks reasonable. Opencoded
xas_for_each() smells bad, but...

And diffstat is fine:

 4 files changed, 153 insertions(+), 131 deletions(-)

Any comments?

diff --git a/include/linux/mm.h b/include/linux/mm.h
index db6ae4d3fb4e..2825153ad0d6 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -534,8 +534,8 @@ struct vm_fault {
 					 * is not NULL, otherwise pmd.
 					 */
 	pgtable_t prealloc_pte;		/* Pre-allocated pte page table.
-					 * vm_ops->map_pages() calls
-					 * alloc_set_pte() from atomic context.
+					 * vm_ops->map_pages() sets up a page
+					 * table from from atomic context.
 					 * do_fault_around() pre-allocates
 					 * page table to avoid allocation from
 					 * atomic context.
@@ -972,7 +972,9 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
 	return pte;
 }
 
-vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page);
+vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page);
+void do_set_pte(struct vm_fault *vmf, struct page *page);
+
 vm_fault_t finish_fault(struct vm_fault *vmf);
 vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf);
 #endif
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index e237004d498d..869c1921ceda 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -1259,6 +1259,17 @@ static inline int pmd_trans_unstable(pmd_t *pmd)
 #endif
 }
 
+/*
+ * the ordering of these checks is important for pmds with _page_devmap set.
+ * if we check pmd_trans_unstable() first we will trip the bad_pmd() check
+ * inside of pmd_none_or_trans_huge_or_clear_bad(). this will end up correctly
+ * returning 1 but not before it spams dmesg with the pmd_clear_bad() output.
+ */
+static inline int pmd_devmap_trans_unstable(pmd_t *pmd)
+{
+	return pmd_devmap(*pmd) || pmd_trans_unstable(pmd);
+}
+
 #ifndef CONFIG_NUMA_BALANCING
 /*
  * Technically a PTE can be PROTNONE even when not doing NUMA balancing but
diff --git a/mm/filemap.c b/mm/filemap.c
index 0b2067b3c328..8fa2183ce10c 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -42,6 +42,7 @@
 #include <linux/psi.h>
 #include <linux/ramfs.h>
 #include <linux/page_idle.h>
+#include <asm/pgalloc.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
@@ -2831,10 +2832,53 @@ vm_fault_t filemap_fault(struct vm_fault *vmf)
 }
 EXPORT_SYMBOL(filemap_fault);
 
+static bool filemap_map_pages_pmd(struct vm_fault *vmf, struct page *page,
+				  struct xa_state *xas)
+{
+	struct address_space *mapping = vmf->vma->vm_file->f_mapping;
+
+	if (xa_is_value(page))
+		return false;
+
+	if (!PageTransHuge(page) || PageLocked(page))
+		return false;
+
+	if (!page_cache_get_speculative(page))
+		return false;
+
+	if (page != xas_reload(xas))
+		goto skip;
+
+	if (!PageTransHuge(page))
+		goto skip;
+
+	if (!PageUptodate(page) || PageReadahead(page) || PageHWPoison(page))
+		goto skip;
+
+	if (!trylock_page(page))
+		goto skip;
+
+	if (page->mapping != mapping || !PageUptodate(page))
+		goto unlock;
+
+	if (xas->xa_index >= DIV_ROUND_UP(i_size_read(mapping->host), PAGE_SIZE))
+		goto unlock;
+
+	do_set_pmd(vmf, page);
+	unlock_page(page);
+	return true;
+unlock:
+	unlock_page(page);
+skip:
+	put_page(page);
+	return false;
+}
+
 void filemap_map_pages(struct vm_fault *vmf,
 		pgoff_t start_pgoff, pgoff_t end_pgoff)
 {
-	struct file *file = vmf->vma->vm_file;
+	struct vm_area_struct *vma = vmf->vma;
+	struct file *file = vma->vm_file;
 	struct address_space *mapping = file->f_mapping;
 	pgoff_t last_pgoff = start_pgoff;
 	unsigned long max_idx;
@@ -2843,20 +2887,54 @@ void filemap_map_pages(struct vm_fault *vmf,
 	unsigned int mmap_miss = READ_ONCE(file->f_ra.mmap_miss);
 
 	rcu_read_lock();
-	xas_for_each(&xas, head, end_pgoff) {
+	head = xas_find(&xas, end_pgoff);
+	if (!head) {
+		rcu_read_unlock();
+		return;
+	}
+
+	while (xas_retry(&xas, head))
+		head = xas_next_entry(&xas, end_pgoff);
+
+	if (pmd_none(*vmf->pmd) && filemap_map_pages_pmd(vmf, head, &xas)) {
+		rcu_read_unlock();
+		return;
+	}
+
+	/* Huge page is mapped? No need to proceed. */
+	if (pmd_trans_huge(*vmf->pmd)) {
+		rcu_read_unlock();
+		return;
+	}
+
+	vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
+	if (likely(pmd_none(*vmf->pmd))) {
+		mm_inc_nr_ptes(vma->vm_mm);
+		pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
+		vmf->prealloc_pte = NULL;
+	}
+	spin_unlock(vmf->ptl);
+
+	/* See comment in handle_pte_fault() */
+	if (pmd_devmap_trans_unstable(vmf->pmd))
+		return rcu_read_unlock();
+
+	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
+				       vmf->address, &vmf->ptl);
+
+	for (; head; head = xas_next_entry(&xas, end_pgoff)) {
 		if (xas_retry(&xas, head))
 			continue;
 		if (xa_is_value(head))
-			goto next;
-
+			continue;
 		/*
 		 * Check for a locked page first, as a speculative
 		 * reference may adversely influence page migration.
 		 */
 		if (PageLocked(head))
-			goto next;
+			continue;
 		if (!page_cache_get_speculative(head))
-			goto next;
+			continue;
 
 		/* Has the page moved or been split? */
 		if (unlikely(head != xas_reload(&xas)))
@@ -2884,19 +2962,18 @@ void filemap_map_pages(struct vm_fault *vmf,
 		if (vmf->pte)
 			vmf->pte += xas.xa_index - last_pgoff;
 		last_pgoff = xas.xa_index;
-		if (alloc_set_pte(vmf, page))
-			goto unlock;
+		if (pte_none(*vmf->pte))
+			do_set_pte(vmf, page);
+		/* no need to invalidate: a not-present page won't be cached */
+		update_mmu_cache(vma, vmf->address, vmf->pte);
 		unlock_page(head);
-		goto next;
+		continue;
 unlock:
 		unlock_page(head);
 skip:
 		put_page(head);
-next:
-		/* Huge page is mapped? No need to proceed. */
-		if (pmd_trans_huge(*vmf->pmd))
-			break;
 	}
+	pte_unmap_unlock(vmf->pte, vmf->ptl);
 	rcu_read_unlock();
 	WRITE_ONCE(file->f_ra.mmap_miss, mmap_miss);
 }
diff --git a/mm/memory.c b/mm/memory.c
index c48f8df6e502..96d62774096a 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3490,7 +3490,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
 	if (pte_alloc(vma->vm_mm, vmf->pmd))
 		return VM_FAULT_OOM;
 
-	/* See the comment in pte_alloc_one_map() */
+	/* See the comment in map_set_pte() */
 	if (unlikely(pmd_trans_unstable(vmf->pmd)))
 		return 0;
 
@@ -3630,66 +3630,6 @@ static vm_fault_t __do_fault(struct vm_fault *vmf)
 	return ret;
 }
 
-/*
- * The ordering of these checks is important for pmds with _PAGE_DEVMAP set.
- * If we check pmd_trans_unstable() first we will trip the bad_pmd() check
- * inside of pmd_none_or_trans_huge_or_clear_bad(). This will end up correctly
- * returning 1 but not before it spams dmesg with the pmd_clear_bad() output.
- */
-static int pmd_devmap_trans_unstable(pmd_t *pmd)
-{
-	return pmd_devmap(*pmd) || pmd_trans_unstable(pmd);
-}
-
-static vm_fault_t pte_alloc_one_map(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-
-	if (!pmd_none(*vmf->pmd))
-		goto map_pte;
-	if (vmf->prealloc_pte) {
-		vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd);
-		if (unlikely(!pmd_none(*vmf->pmd))) {
-			spin_unlock(vmf->ptl);
-			goto map_pte;
-		}
-
-		mm_inc_nr_ptes(vma->vm_mm);
-		pmd_populate(vma->vm_mm, vmf->pmd, vmf->prealloc_pte);
-		spin_unlock(vmf->ptl);
-		vmf->prealloc_pte = NULL;
-	} else if (unlikely(pte_alloc(vma->vm_mm, vmf->pmd))) {
-		return VM_FAULT_OOM;
-	}
-map_pte:
-	/*
-	 * If a huge pmd materialized under us just retry later.  Use
-	 * pmd_trans_unstable() via pmd_devmap_trans_unstable() instead of
-	 * pmd_trans_huge() to ensure the pmd didn't become pmd_trans_huge
-	 * under us and then back to pmd_none, as a result of MADV_DONTNEED
-	 * running immediately after a huge pmd fault in a different thread of
-	 * this mm, in turn leading to a misleading pmd_trans_huge() retval.
-	 * All we have to ensure is that it is a regular pmd that we can walk
-	 * with pte_offset_map() and we can do that through an atomic read in
-	 * C, which is what pmd_trans_unstable() provides.
-	 */
-	if (pmd_devmap_trans_unstable(vmf->pmd))
-		return VM_FAULT_NOPAGE;
-
-	/*
-	 * At this point we know that our vmf->pmd points to a page of ptes
-	 * and it cannot become pmd_none(), pmd_devmap() or pmd_trans_huge()
-	 * for the duration of the fault.  If a racing MADV_DONTNEED runs and
-	 * we zap the ptes pointed to by our vmf->pmd, the vmf->ptl will still
-	 * be valid and we will re-check to make sure the vmf->pte isn't
-	 * pte_none() under vmf->ptl protection when we return to
-	 * alloc_set_pte().
-	 */
-	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address,
-			&vmf->ptl);
-	return 0;
-}
-
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 static void deposit_prealloc_pte(struct vm_fault *vmf)
 {
@@ -3704,7 +3644,7 @@ static void deposit_prealloc_pte(struct vm_fault *vmf)
 	vmf->prealloc_pte = NULL;
 }
 
-static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
+vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
@@ -3769,45 +3709,11 @@ static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
 }
 #endif
 
-/**
- * alloc_set_pte - setup new PTE entry for given page and add reverse page
- * mapping. If needed, the function allocates page table or use pre-allocated.
- *
- * @vmf: fault environment
- * @page: page to map
- *
- * Caller must take care of unlocking vmf->ptl, if vmf->pte is non-NULL on
- * return.
- *
- * Target users are page handler itself and implementations of
- * vm_ops->map_pages.
- *
- * Return: %0 on success, %VM_FAULT_ code in case of error.
- */
-vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
+void do_set_pte(struct vm_fault *vmf, struct page *page)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	bool write = vmf->flags & FAULT_FLAG_WRITE;
 	pte_t entry;
-	vm_fault_t ret;
-
-	if (pmd_none(*vmf->pmd) && PageTransCompound(page)) {
-		ret = do_set_pmd(vmf, page);
-		if (ret != VM_FAULT_FALLBACK)
-			return ret;
-	}
-
-	if (!vmf->pte) {
-		ret = pte_alloc_one_map(vmf);
-		if (ret)
-			return ret;
-	}
-
-	/* Re-check under ptl */
-	if (unlikely(!pte_none(*vmf->pte))) {
-		update_mmu_tlb(vma, vmf->address, vmf->pte);
-		return VM_FAULT_NOPAGE;
-	}
 
 	flush_icache_page(vma, page);
 	entry = mk_pte(page, vma->vm_page_prot);
@@ -3824,14 +3730,8 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
 		page_add_file_rmap(page, false);
 	}
 	set_pte_at(vma->vm_mm, vmf->address, vmf->pte, entry);
-
-	/* no need to invalidate: a not-present page won't be cached */
-	update_mmu_cache(vma, vmf->address, vmf->pte);
-
-	return 0;
 }
 
-
 /**
  * finish_fault - finish page fault once we have prepared the page to fault
  *
@@ -3849,12 +3749,12 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct page *page)
  */
 vm_fault_t finish_fault(struct vm_fault *vmf)
 {
+	struct vm_area_struct *vma = vmf->vma;
 	struct page *page;
-	vm_fault_t ret = 0;
+	vm_fault_t ret;
 
 	/* Did we COW the page? */
-	if ((vmf->flags & FAULT_FLAG_WRITE) &&
-	    !(vmf->vma->vm_flags & VM_SHARED))
+	if ((vmf->flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED))
 		page = vmf->cow_page;
 	else
 		page = vmf->page;
@@ -3863,13 +3763,35 @@ vm_fault_t finish_fault(struct vm_fault *vmf)
 	 * check even for read faults because we might have lost our CoWed
 	 * page
 	 */
-	if (!(vmf->vma->vm_flags & VM_SHARED))
-		ret = check_stable_address_space(vmf->vma->vm_mm);
-	if (!ret)
-		ret = alloc_set_pte(vmf, page);
-	if (vmf->pte)
-		pte_unmap_unlock(vmf->pte, vmf->ptl);
-	return ret;
+	if (!(vma->vm_flags & VM_SHARED))
+		ret = check_stable_address_space(vma->vm_mm);
+	if (ret)
+		return ret;
+
+	if (pmd_none(*vmf->pmd)) {
+		if (PageTransCompound(page)) {
+			ret = do_set_pmd(vmf, page);
+			if (ret != VM_FAULT_FALLBACK)
+				return ret;
+		}
+
+		if (unlikely(pte_alloc(vma->vm_mm, vmf->pmd)))
+			return VM_FAULT_OOM;
+	}
+
+	/* See comment in handle_pte_fault() */
+	if (pmd_devmap_trans_unstable(vmf->pmd))
+		return 0;
+
+	vmf->pte = pte_offset_map_lock(vma->vm_mm, vmf->pmd,
+				      vmf->address, &vmf->ptl);
+	/* Re-check under ptl */
+	if (likely(pte_none(*vmf->pte)))
+		do_set_pte(vmf, page);
+
+	update_mmu_tlb(vma, vmf->address, vmf->pte);
+	pte_unmap_unlock(vmf->pte, vmf->ptl);
+	return 0;
 }
 
 static unsigned long fault_around_bytes __read_mostly =
@@ -3980,7 +3902,6 @@ static vm_fault_t do_fault_around(struct vm_fault *vmf)
 	vmf->pte -= (vmf->address >> PAGE_SHIFT) - (address >> PAGE_SHIFT);
 	if (!pte_none(*vmf->pte))
 		ret = VM_FAULT_NOPAGE;
-	pte_unmap_unlock(vmf->pte, vmf->ptl);
 out:
 	vmf->address = address;
 	vmf->pte = NULL;
@@ -4340,7 +4261,18 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
 		 */
 		vmf->pte = NULL;
 	} else {
-		/* See comment in pte_alloc_one_map() */
+		/*
+		 * If a huge pmd materialized under us just retry later.  Use
+		 * pmd_trans_unstable() via pmd_devmap_trans_unstable() instead
+		 * of pmd_trans_huge() to ensure the pmd didn't become
+		 * pmd_trans_huge under us and then back to pmd_none, as a
+		 * result of MADV_DONTNEED running immediately after a huge pmd
+		 * fault in a different thread of this mm, in turn leading to a
+		 * misleading pmd_trans_huge() retval. All we have to ensure is
+		 * that it is a regular pmd that we can walk with
+		 * pte_offset_map() and we can do that through an atomic read
+		 * in C, which is what pmd_trans_unstable() provides.
+		 */
 		if (pmd_devmap_trans_unstable(vmf->pmd))
 			return 0;
 		/*
-- 
 Kirill A. Shutemov

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-09 16:39 [PATCH 0/2] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon
2020-12-09 16:39 ` [PATCH 1/2] mm: Allow architectures to request 'old' entries when prefaulting Will Deacon
2020-12-09 17:58   ` Linus Torvalds
2020-12-09 18:40     ` Will Deacon
2020-12-09 19:04       ` Linus Torvalds
2020-12-09 20:32         ` Matthew Wilcox
2020-12-09 21:04           ` Linus Torvalds
2020-12-10 15:08         ` Kirill A. Shutemov
2020-12-10 17:23           ` Linus Torvalds
2020-12-14 16:07             ` Kirill A. Shutemov [this message]
2020-12-14 17:54               ` Linus Torvalds
2020-12-14 18:56                 ` Matthew Wilcox
2020-12-16 17:07                 ` Kirill A. Shutemov
2020-12-16 18:41                   ` Linus Torvalds
2020-12-17 10:54                     ` Kirill A. Shutemov
2020-12-17 18:22                       ` Linus Torvalds
2020-12-18 11:04                         ` Kirill A. Shutemov
2020-12-18 18:56                           ` Linus Torvalds
2020-12-19 12:41                             ` Kirill A. Shutemov
2020-12-19 20:08                               ` Linus Torvalds
2020-12-19 20:34                               ` Linus Torvalds
2020-12-22 10:00                                 ` Kirill A. Shutemov
2020-12-24  4:04                                   ` Hugh Dickins
2020-12-25 11:31                                     ` Kirill A. Shutemov
2020-12-26 17:57                                       ` Linus Torvalds
2020-12-26 20:43                                         ` Kirill A. Shutemov
2020-12-26 21:03                                           ` Hugh Dickins
2020-12-26 21:16                                             ` Linus Torvalds
2020-12-26 22:40                                               ` Kirill A. Shutemov
2020-12-27  0:45                                                 ` Hugh Dickins
2020-12-27  2:38                                                   ` Hugh Dickins
2020-12-27 19:38                                                     ` Linus Torvalds
2020-12-27 20:32                                                       ` Damian Tometzki
2020-12-27 22:35                                                         ` Hugh Dickins
2020-12-27 23:12                                                           ` Linus Torvalds
2020-12-27 23:40                                                             ` Linus Torvalds
2020-12-27 23:55                                                               ` Kirill A. Shutemov
2020-12-27 23:48                                                       ` Kirill A. Shutemov
2020-12-28  1:54                                                         ` Linus Torvalds
2020-12-28  6:43                                                           ` Hugh Dickins
2020-12-28 12:53                                                             ` Kirill A. Shutemov
2020-12-28 18:47                                                               ` Linus Torvalds
2020-12-28 21:58                                                                 ` Linus Torvalds
2020-12-29 13:28                                                                   ` Kirill A. Shutemov
2020-12-29 15:19                                                                     ` Matthew Wilcox
2020-12-29 20:52                                                                     ` Linus Torvalds
2020-12-28 22:05                                                                 ` Kirill A. Shutemov
2020-12-28 22:12                                                                   ` Kirill A. Shutemov
2020-12-29  4:35                                                                     ` Hugh Dickins
2020-12-28 23:28                                                                   ` Linus Torvalds
2020-12-26 21:07                                           ` Linus Torvalds
2020-12-26 21:41                                           ` Matthew Wilcox
2020-12-09 16:39 ` [PATCH 2/2] arm64: mm: Implement arch_wants_old_faultaround_pte() Will Deacon
2020-12-09 18:35   ` Catalin Marinas
2020-12-09 18:46     ` Will Deacon

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Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git