mm/damon/vaddr: separate commonly usable functions

This moves functions in the default virtual address spaces monitoring
primitives that commonly usable from other address spaces like physical
address space into a header file.  Those will be reused by the physical
address space monitoring primitives which will be implemented by the
following commit.

[sj@kernel.org: include 'highmem.h' to fix a build failure]
Link: https://lkml.kernel.org/r/20211014110848.5204-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20211012205711.29216-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rienjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leonard Foerster <foersleo@amazon.de>
Cc: Marco Elver <elver@google.com>
Cc: Markus Boehme <markubo@amazon.de>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/damon/Makefile b/mm/damon/Makefile
index fed4be3..99b1bfe 100644 (file)
--- a/mm/damon/Makefile
+++ b/mm/damon/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_DAMON)            := core.o
-obj-$(CONFIG_DAMON_VADDR)      += vaddr.o
+obj-$(CONFIG_DAMON_VADDR)      += prmtv-common.o vaddr.o
 obj-$(CONFIG_DAMON_DBGFS)      += dbgfs.o

diff --git a/mm/damon/prmtv-common.c b/mm/damon/prmtv-common.c
new file mode 100644 (file)
index 0000000..7e62ee5
--- /dev/null
+++ b/mm/damon/prmtv-common.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Common Primitives for Data Access Monitoring
+ *
+ * Author: SeongJae Park <sj@kernel.org>
+ */
+
+#include <linux/mmu_notifier.h>
+#include <linux/page_idle.h>
+#include <linux/pagemap.h>
+#include <linux/rmap.h>
+
+#include "prmtv-common.h"
+
+/*
+ * Get an online page for a pfn if it's in the LRU list.  Otherwise, returns
+ * NULL.
+ *
+ * The body of this function is stolen from the 'page_idle_get_page()'.  We
+ * steal rather than reuse it because the code is quite simple.
+ */
+struct page *damon_get_page(unsigned long pfn)
+{
+       struct page *page = pfn_to_online_page(pfn);
+
+       if (!page || !PageLRU(page) || !get_page_unless_zero(page))
+               return NULL;
+
+       if (unlikely(!PageLRU(page))) {
+               put_page(page);
+               page = NULL;
+       }
+       return page;
+}
+
+void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr)
+{
+       bool referenced = false;
+       struct page *page = damon_get_page(pte_pfn(*pte));
+
+       if (!page)
+               return;
+
+       if (pte_young(*pte)) {
+               referenced = true;
+               *pte = pte_mkold(*pte);
+       }
+
+#ifdef CONFIG_MMU_NOTIFIER
+       if (mmu_notifier_clear_young(mm, addr, addr + PAGE_SIZE))
+               referenced = true;
+#endif /* CONFIG_MMU_NOTIFIER */
+
+       if (referenced)
+               set_page_young(page);
+
+       set_page_idle(page);
+       put_page(page);
+}
+
+void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr)
+{
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+       bool referenced = false;
+       struct page *page = damon_get_page(pmd_pfn(*pmd));
+
+       if (!page)
+               return;
+
+       if (pmd_young(*pmd)) {
+               referenced = true;
+               *pmd = pmd_mkold(*pmd);
+       }
+
+#ifdef CONFIG_MMU_NOTIFIER
+       if (mmu_notifier_clear_young(mm, addr,
+                               addr + ((1UL) << HPAGE_PMD_SHIFT)))
+               referenced = true;
+#endif /* CONFIG_MMU_NOTIFIER */
+
+       if (referenced)
+               set_page_young(page);
+
+       set_page_idle(page);
+       put_page(page);
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+}

diff --git a/mm/damon/prmtv-common.h b/mm/damon/prmtv-common.h
new file mode 100644 (file)
index 0000000..7093d19
--- /dev/null
+++ b/mm/damon/prmtv-common.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Common Primitives for Data Access Monitoring
+ *
+ * Author: SeongJae Park <sj@kernel.org>
+ */
+
+#include <linux/damon.h>
+#include <linux/random.h>
+
+/* Get a random number in [l, r) */
+#define damon_rand(l, r) (l + prandom_u32_max(r - l))
+
+struct page *damon_get_page(unsigned long pfn);
+
+void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm, unsigned long addr);
+void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr);

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 953c145..f0aef35 100644 (file)
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -8,25 +8,19 @@
 #define pr_fmt(fmt) "damon-va: " fmt
 
 #include <asm-generic/mman-common.h>
-#include <linux/damon.h>
+#include <linux/highmem.h>
 #include <linux/hugetlb.h>
-#include <linux/mm.h>
 #include <linux/mmu_notifier.h>
-#include <linux/highmem.h>
 #include <linux/page_idle.h>
 #include <linux/pagewalk.h>
-#include <linux/random.h>
-#include <linux/sched/mm.h>
-#include <linux/slab.h>
+
+#include "prmtv-common.h"
 
 #ifdef CONFIG_DAMON_VADDR_KUNIT_TEST
 #undef DAMON_MIN_REGION
 #define DAMON_MIN_REGION 1
 #endif
 
-/* Get a random number in [l, r) */
-#define damon_rand(l, r) (l + prandom_u32_max(r - l))
-
 /*
  * 't->id' should be the pointer to the relevant 'struct pid' having reference
  * count.  Caller must put the returned task, unless it is NULL.
@@ -373,82 +367,6 @@ void damon_va_update(struct damon_ctx *ctx)
        }
 }
 
-/*
- * Get an online page for a pfn if it's in the LRU list.  Otherwise, returns
- * NULL.
- *
- * The body of this function is stolen from the 'page_idle_get_page()'.  We
- * steal rather than reuse it because the code is quite simple.
- */
-static struct page *damon_get_page(unsigned long pfn)
-{
-       struct page *page = pfn_to_online_page(pfn);
-
-       if (!page || !PageLRU(page) || !get_page_unless_zero(page))
-               return NULL;
-
-       if (unlikely(!PageLRU(page))) {
-               put_page(page);
-               page = NULL;
-       }
-       return page;
-}
-
-static void damon_ptep_mkold(pte_t *pte, struct mm_struct *mm,
-                            unsigned long addr)
-{
-       bool referenced = false;
-       struct page *page = damon_get_page(pte_pfn(*pte));
-
-       if (!page)
-               return;
-
-       if (pte_young(*pte)) {
-               referenced = true;
-               *pte = pte_mkold(*pte);
-       }
-
-#ifdef CONFIG_MMU_NOTIFIER
-       if (mmu_notifier_clear_young(mm, addr, addr + PAGE_SIZE))
-               referenced = true;
-#endif /* CONFIG_MMU_NOTIFIER */
-
-       if (referenced)
-               set_page_young(page);
-
-       set_page_idle(page);
-       put_page(page);
-}
-
-static void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm,
-                            unsigned long addr)
-{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-       bool referenced = false;
-       struct page *page = damon_get_page(pmd_pfn(*pmd));
-
-       if (!page)
-               return;
-
-       if (pmd_young(*pmd)) {
-               referenced = true;
-               *pmd = pmd_mkold(*pmd);
-       }
-
-#ifdef CONFIG_MMU_NOTIFIER
-       if (mmu_notifier_clear_young(mm, addr,
-                               addr + ((1UL) << HPAGE_PMD_SHIFT)))
-               referenced = true;
-#endif /* CONFIG_MMU_NOTIFIER */
-
-       if (referenced)
-               set_page_young(page);
-
-       set_page_idle(page);
-       put_page(page);
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-}
-
 static int damon_mkold_pmd_entry(pmd_t *pmd, unsigned long addr,
                unsigned long next, struct mm_walk *walk)
 {