[PATCH] arm64: calculate the various pages number to show
From: zhongjiang
Date: Wed Nov 25 2015 - 08:48:35 EST
This patch add the interface to show the number of 4KB or 64KB page,
aims to statistics the number of different types of pages.
Signed-off-by: zhongjiang <zhongjiang@xxxxxxxxxx>
---
arch/arm64/include/asm/pgtable-types.h | 24 ++++++++++++++++++++++++
arch/arm64/mm/mmu.c | 28 ++++++++++++++++++++++++++++
arch/arm64/mm/pageattr.c | 31 +++++++++++++++++++++++++++++++
3 files changed, 83 insertions(+), 0 deletions(-)
diff --git a/arch/arm64/include/asm/pgtable-types.h b/arch/arm64/include/asm/pgtable-types.h
index 2b1bd7e..aa52546 100644
--- a/arch/arm64/include/asm/pgtable-types.h
+++ b/arch/arm64/include/asm/pgtable-types.h
@@ -86,6 +86,30 @@ typedef pteval_t pgprot_t;
#endif /* STRICT_MM_TYPECHECKS */
+struct seq_file;
+extern void arch_report_meminfo(struct seq_file *m);
+
+enum pg_level {
+ PG_LEVEL_NONE,
+#ifdef CONFIG_ARM64_4K_PAGES
+ PG_LEVEL_4K,
+ PG_LEVEL_2M,
+ PG_LEVEL_1G,
+#else
+ PG_LEVEL_64K,
+ PG_LEVEL_512M,
+#endif
+ PG_LEVEL_NUM
+};
+
+#ifdef CONFIG_PROC_FS
+extern void update_page_count(int level, unsigned long pages);
+extern void split_page_count(int level);
+#else
+static inline void update_page_count(int level, unsigned long pages) {}
+static inline void split_page_count(int level) {}
+#endif
+
#if CONFIG_PGTABLE_LEVELS == 2
#include <asm-generic/pgtable-nopmd.h>
#elif CONFIG_PGTABLE_LEVELS == 3
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 0a7bee7..f9772d0 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -30,6 +30,7 @@
#include <linux/stop_machine.h>
#include <linux/bootmem.h>
+#include <asm/pgtable-types.h>
#include <asm/cputype.h>
#include <asm/fixmap.h>
#include <asm/sections.h>
@@ -85,6 +86,11 @@ void split_pmd(pmd_t *pmd, pte_t *pte)
set_pte(pte, pfn_pte(pfn, prot));
pfn++;
} while (pte++, i++, i < PTRS_PER_PTE);
+#ifdef CONFIG_ARM64_4K_PAGES
+ split_page_count(PG_LEVEL_2M);
+#else
+ split_page_count(PG_LEVEL_512M);
+#endif
}
static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
@@ -93,6 +99,7 @@ static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
void *(*alloc)(unsigned long size))
{
pte_t *pte;
+ unsigned long i = 0;
if (pmd_none(*pmd) || pmd_sect(*pmd)) {
pte = alloc(PTRS_PER_PTE * sizeof(pte_t));
@@ -107,7 +114,13 @@ static void alloc_init_pte(pmd_t *pmd, unsigned long addr,
do {
set_pte(pte, pfn_pte(pfn, prot));
pfn++;
+ i++;
} while (pte++, addr += PAGE_SIZE, addr != end);
+#ifdef CONFIG_ARM64_4K_PAGES
+ update_page_count(PG_LEVEL_4K, i);
+#else
+ update_page_count(PG_LEVEL_64K, i);
+#endif
}
void split_pud(pud_t *old_pud, pmd_t *pmd)
@@ -120,6 +133,9 @@ void split_pud(pud_t *old_pud, pmd_t *pmd)
set_pmd(pmd, __pmd(addr | prot));
addr += PMD_SIZE;
} while (pmd++, i++, i < PTRS_PER_PMD);
+#ifdef CONFIG_ARM64_4K_PAGES
+ split_page_count(PG_LEVEL_1G);
+#endif
}
static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud,
@@ -129,6 +145,7 @@ static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud,
{
pmd_t *pmd;
unsigned long next;
+ unsigned long i = 0;
/*
* Check for initial section mappings in the pgd/pud and remove them.
@@ -159,6 +176,7 @@ static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud,
* Check for previous table entries created during
* boot (__create_page_tables) and flush them.
*/
+ i++;
if (!pmd_none(old_pmd)) {
flush_tlb_all();
if (pmd_table(old_pmd)) {
@@ -173,6 +191,11 @@ static void alloc_init_pmd(struct mm_struct *mm, pud_t *pud,
}
phys += next - addr;
} while (pmd++, addr = next, addr != end);
+#ifdef CONFIG_ARM64_4K_PAGES
+ update_page_count(PG_LEVEL_2M, i);
+#else
+ update_page_count(PG_LEVEL_512M, i);
+#endif
}
static inline bool use_1G_block(unsigned long addr, unsigned long next,
@@ -194,6 +217,7 @@ static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd,
{
pud_t *pud;
unsigned long next;
+ unsigned long i = 0;
if (pgd_none(*pgd)) {
pud = alloc(PTRS_PER_PUD * sizeof(pud_t));
@@ -220,6 +244,7 @@ static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd,
*
* Look up the old pmd table and free it.
*/
+ i++;
if (!pud_none(old_pud)) {
flush_tlb_all();
if (pud_table(old_pud)) {
@@ -233,6 +258,9 @@ static void alloc_init_pud(struct mm_struct *mm, pgd_t *pgd,
}
phys += next - addr;
} while (pud++, addr = next, addr != end);
+#ifdef CONFIG_ARM64_4K_PAGES
+ update_page_count(PG_LEVEL_1G, i);
+#endif
}
/*
diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c
index 7a5ff11..c1888b9 100644
--- a/arch/arm64/mm/pageattr.c
+++ b/arch/arm64/mm/pageattr.c
@@ -15,12 +15,43 @@
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/seq_file.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include "mm.h"
+static unsigned long direct_pages_count[PG_LEVEL_NUM];
+
+void update_page_count(int level, unsigned long pages)
+{
+ direct_pages_count[level] += pages;
+}
+
+void split_page_count(int level)
+{
+ direct_pages_count[level]--;
+ direct_pages_count[level-1] += PTRS_PER_PTE;
+}
+
+void arch_report_meminfo(struct seq_file *m)
+{
+#ifdef CONFIG_ARM64_4K_PAGES
+ seq_printf(m, "DirectMap4k: %8lu kB\n",
+ direct_pages_count[PG_LEVEL_4K] << 2);
+ seq_printf(m, "DirectMap2M: %8lu kB\n",
+ direct_pages_count[PG_LEVEL_2M] << 11);
+ seq_printf(m, "DirectMap1G: %8lu kB\n",
+ direct_pages_count[PG_LEVEL_1G] << 20);
+#else
+ seq_printf(m, "DirectMap64k: %8lu kB\n",
+ direct_pages_count[PG_LEVEL_64K] << 6);
+ seq_printf(m, "DirectMap512M: %8lu kB\n",
+ direct_pages_count[PG_LEVEL_512M] << 19);
+#endif
+}
+
static int update_pte_range(struct mm_struct *mm, pmd_t *pmd,
unsigned long addr, unsigned long end,
pgprot_t clear, pgprot_t set)
--
1.7.7
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