* [PATCH 2/2] powerpc/mm/book3s/radix: Add mapping statistics
2018-07-18 8:01 [PATCH 1/2] powerpc/mm/book3s/radix: Drop the unnecessary retry when creating linear mapping Aneesh Kumar K.V
@ 2018-07-18 8:01 ` Aneesh Kumar K.V
0 siblings, 0 replies; 2+ messages in thread
From: Aneesh Kumar K.V @ 2018-07-18 8:01 UTC (permalink / raw)
To: npiggin, benh, paulus, mpe; +Cc: linuxppc-dev, Aneesh Kumar K.V
Add statistics that show how memory is mapped within the kernel linear mapping.
This is similar to commit 37cd944c8d8f ("s390/pgtable: add mapping statistics")
We don't do this with Hash translation mode. Hash uses one size (mmu_linear_psize)
to map the kernel linear mapping and we print the linear psize during boot as
below.
"Page orders: linear mapping = 24, virtual = 16, io = 16, vmemmap = 24"
A sample output looks like:
DirectMap4k: 0 kB
DirectMap64k: 18432 kB
DirectMap2M: 1030144 kB
DirectMap1G: 11534336 kB
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
---
arch/powerpc/include/asm/book3s/64/pgalloc.h | 13 ++++++++++++
arch/powerpc/include/asm/book3s/64/radix.h | 3 +++
arch/powerpc/mm/pgtable-book3s64.c | 22 ++++++++++++++++++++
arch/powerpc/mm/pgtable-radix.c | 13 +++++++-----
4 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
index 01ee40f11f3a..1d2d69ae1bd2 100644
--- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
+++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
@@ -208,4 +208,17 @@ static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
#define check_pgt_cache() do { } while (0)
+extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
+static inline void update_page_count(unsigned long mapping_shift, long count)
+{
+ int level;
+
+ if (IS_ENABLED(CONFIG_PROC_FS)) {
+ level = shift_to_mmu_psize(mapping_shift);
+ if (level < 0)
+ return;
+ atomic_long_add(count, &direct_pages_count[level]);
+ }
+}
+
#endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */
diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
index 3ab3f7aef022..56a6e3f5f7c1 100644
--- a/arch/powerpc/include/asm/book3s/64/radix.h
+++ b/arch/powerpc/include/asm/book3s/64/radix.h
@@ -30,6 +30,9 @@
#define RADIX_PUD_BAD_BITS 0x60000000000000e0UL
#define RADIX_PGD_BAD_BITS 0x60000000000000e0UL
+#define RADIX_PMD_SHIFT (PAGE_SHIFT + RADIX_PTE_INDEX_SIZE)
+#define RADIX_PUD_SHIFT (RADIX_PMD_SHIFT + RADIX_PMD_INDEX_SIZE)
+#define RADIX_PGD_SHIFT (RADIX_PUD_SHIFT + RADIX_PUD_INDEX_SIZE)
/*
* Size of EA range mapped by our pagetables.
*/
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
index 4afbfbb64bfd..5d2328ef7958 100644
--- a/arch/powerpc/mm/pgtable-book3s64.c
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -450,3 +450,25 @@ void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int index)
return pgtable_free(table, index);
}
#endif
+
+#ifdef CONFIG_PROC_FS
+atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
+
+void arch_report_meminfo(struct seq_file *m)
+{
+ /*
+ * Hash maps the memory with one size mmu_linear_psize.
+ * So don't bother to print these on hash
+ */
+ if (!radix_enabled())
+ return;
+ seq_printf(m, "DirectMap4k: %8lu kB\n",
+ atomic_long_read(&direct_pages_count[MMU_PAGE_4K]) << 2);
+ seq_printf(m, "DirectMap64k: %8lu kB\n",
+ atomic_long_read(&direct_pages_count[MMU_PAGE_64K]) << 6);
+ seq_printf(m, "DirectMap2M: %8lu kB\n",
+ atomic_long_read(&direct_pages_count[MMU_PAGE_2M]) << 11);
+ seq_printf(m, "DirectMap1G: %8lu kB\n",
+ atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20);
+}
+#endif /* CONFIG_PROC_FS */
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index d9819e573103..5c5ca58e7d1f 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -259,6 +259,7 @@ static int __meminit create_physical_mapping(unsigned long start,
unsigned long end,
int nid)
{
+ int mapping_shift;
unsigned long vaddr, addr, mapping_size = 0;
pgprot_t prot;
#ifdef CONFIG_STRICT_KERNEL_RWX
@@ -277,18 +278,19 @@ static int __meminit create_physical_mapping(unsigned long start,
if (IS_ALIGNED(addr, PUD_SIZE) && gap >= PUD_SIZE &&
mmu_psize_defs[MMU_PAGE_1G].shift)
- mapping_size = PUD_SIZE;
+ mapping_shift = RADIX_PUD_SHIFT;
else if (IS_ALIGNED(addr, PMD_SIZE) && gap >= PMD_SIZE &&
mmu_psize_defs[MMU_PAGE_2M].shift)
- mapping_size = PMD_SIZE;
+ mapping_shift = RADIX_PMD_SHIFT;
else
- mapping_size = PAGE_SIZE;
+ mapping_shift = PAGE_SHIFT;
- if (split_text_mapping && (mapping_size != PAGE_SIZE) &&
+ if (split_text_mapping && (mapping_shift != PAGE_SHIFT) &&
(addr <= __pa_symbol(__init_begin)) &&
(addr + mapping_size) >= __pa_symbol(_stext))
- mapping_size = PAGE_SIZE;
+ mapping_shift = PAGE_SHIFT;
+ mapping_size = (1UL << mapping_shift);
if (mapping_size != previous_size) {
print_mapping(start, addr, previous_size);
start = addr;
@@ -305,6 +307,7 @@ static int __meminit create_physical_mapping(unsigned long start,
rc = __map_kernel_page(vaddr, addr, prot, mapping_size, nid, start, end);
if (rc)
return rc;
+ update_page_count(mapping_shift, 1);
}
print_mapping(start, addr, mapping_size);
--
2.17.1
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