[PATCH v6 01/23] mm: Introduce PTE_MARKER swap entry

Peter Xu
2021-11-15T07:56:05Z

This patch introduces a new swap entry type called PTE_MARKER. It can be
installed for any pte that maps a file-backed memory when the pte is
temporarily zapped, so as to maintain per-pte information.

The information that kept in the pte is called a "marker". Here we define the
marker as "unsigned long" just to match pgoff_t, however it will only work if
it still fits in swp_offset(), which is e.g. currently 58 bits on x86_64.

A new config CONFIG_PTE_MARKER is introduced too; it's by default off. A bunch
of helpers are defined altogether to service the rest of the pte marker code.

Signed-off-by: Peter Xu <peterx@redhat.com>
---
include/asm-generic/hugetlb.h | 9 ++++
include/linux/swap.h | 15 ++++++-
include/linux/swapops.h | 78 +++++++++++++++++++++++++++++++++++
mm/Kconfig | 7 ++++
4 files changed, 108 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/hugetlb.h b/include/asm-generic/hugetlb.h
index 8e1e6244a89d..f39cad20ffc6 100644
--- a/include/asm-generic/hugetlb.h
+++ b/include/asm-generic/hugetlb.h
@@ -2,6 +2,9 @@
#ifndef _ASM_GENERIC_HUGETLB_H
#define _ASM_GENERIC_HUGETLB_H

+#include <linux/swap.h>
+#include <linux/swapops.h>
+
static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot)
{
return mk_pte(page, pgprot);
@@ -80,6 +83,12 @@ static inline int huge_pte_none(pte_t pte)
}
#endif

+/* Please refer to comments above pte_none_mostly() for the usage */
+static inline int huge_pte_none_mostly(pte_t pte)
+{
+ return huge_pte_none(pte) || is_pte_marker(pte);
+}
+
#ifndef __HAVE_ARCH_HUGE_PTE_WRPROTECT
static inline pte_t huge_pte_wrprotect(pte_t pte)
{
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d1ea44b31f19..cc9adcfd666f 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -55,6 +55,19 @@ static inline int current_is_kswapd(void)
* actions on faults.
*/

+/*
+ * PTE markers are used to persist information onto PTEs that are mapped with
+ * file-backed memories. As its name "PTE" hints, it should only be applied to
+ * the leaves of pgtables.
+ */
+#ifdef CONFIG_PTE_MARKER
+#define SWP_PTE_MARKER_NUM 1
+#define SWP_PTE_MARKER (MAX_SWAPFILES + SWP_HWPOISON_NUM + \
+ SWP_MIGRATION_NUM + SWP_DEVICE_NUM)
+#else
+#define SWP_PTE_MARKER_NUM 0
+#endif
+
/*
* Unaddressable device memory support. See include/linux/hmm.h and
* Documentation/vm/hmm.rst. Short description is we need struct pages for
@@ -100,7 +113,7 @@ static inline int current_is_kswapd(void)

#define MAX_SWAPFILES \
((1 << MAX_SWAPFILES_SHIFT) - SWP_DEVICE_NUM - \
- SWP_MIGRATION_NUM - SWP_HWPOISON_NUM)
+ SWP_MIGRATION_NUM - SWP_HWPOISON_NUM - SWP_PTE_MARKER_NUM)

/*
* Magic header for a swap area. The first part of the union is
diff --git a/include/linux/swapops.h b/include/linux/swapops.h
index d356ab4047f7..5103d2a4ae38 100644
--- a/include/linux/swapops.h
+++ b/include/linux/swapops.h
@@ -247,6 +247,84 @@ static inline int is_writable_migration_entry(swp_entry_t entry)

#endif

+typedef unsigned long pte_marker;
+
+#define PTE_MARKER_MASK (0)
+
+#ifdef CONFIG_PTE_MARKER
+
+static inline swp_entry_t make_pte_marker_entry(pte_marker marker)
+{
+ return swp_entry(SWP_PTE_MARKER, marker);
+}
+
+static inline bool is_pte_marker_entry(swp_entry_t entry)
+{
+ return swp_type(entry) == SWP_PTE_MARKER;
+}
+
+static inline pte_marker pte_marker_get(swp_entry_t entry)
+{
+ return swp_offset(entry) & PTE_MARKER_MASK;
+}
+
+static inline bool is_pte_marker(pte_t pte)
+{
+ return is_swap_pte(pte) && is_pte_marker_entry(pte_to_swp_entry(pte));
+}
+
+#else /* CONFIG_PTE_MARKER */
+
+static inline swp_entry_t make_pte_marker_entry(pte_marker marker)
+{
+ /* This should never be called if !CONFIG_PTE_MARKER */
+ WARN_ON_ONCE(1);
+ return swp_entry(0, 0);
+}
+
+static inline bool is_pte_marker_entry(swp_entry_t entry)
+{
+ return false;
+}
+
+static inline pte_marker pte_marker_get(swp_entry_t entry)
+{
+ return 0;
+}
+
+static inline bool is_pte_marker(pte_t pte)
+{
+ return false;
+}
+
+#endif /* CONFIG_PTE_MARKER */
+
+static inline pte_t make_pte_marker(pte_marker marker)
+{
+ return swp_entry_to_pte(make_pte_marker_entry(marker));
+}
+
+/*
+ * This is a special version to check pte_none() just to cover the case when
+ * the pte is a pte marker. It existed because in many cases the pte marker
+ * should be seen as a none pte; it's just that we have stored some information
+ * onto the none pte so it becomes not-none any more.
+ *
+ * It should be used when the pte is file-backed, ram-based and backing
+ * userspace pages, like shmem. It is not needed upon pgtables that do not
+ * support pte markers at all. For example, it's not needed on anonymous
+ * memory, kernel-only memory (including when the system is during-boot),
+ * non-ram based generic file-system. It's fine to be used even there, but the
+ * extra pte marker check will be pure overhead.
+ *
+ * For systems configured with !CONFIG_PTE_MARKER this will be automatically
+ * optimized to pte_none().
+ */
+static inline int pte_none_mostly(pte_t pte)
+{
+ return pte_none(pte) || is_pte_marker(pte);
+}
+
static inline struct page *pfn_swap_entry_to_page(swp_entry_t entry)
{
struct page *p = pfn_to_page(swp_offset(entry));
diff --git a/mm/Kconfig b/mm/Kconfig
index 068ce591a13a..66f23c6c2032 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -897,6 +897,13 @@ config IO_MAPPING
config SECRETMEM
def_bool ARCH_HAS_SET_DIRECT_MAP && !EMBEDDED

+config PTE_MARKER
+ def_bool n
+ bool "Marker PTEs support"
+
+ help
+ Allows to create marker PTEs for file-backed memory.
+
source "mm/damon/Kconfig"

endmenu
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2.32.0