csky: Fixup _PAGE_ACCESSED for default pgprot

When the system memory is exhausted, linux will trigger kswapd to
shrink memory page cache. We found the csky's .text file mapping
pages would be reclaimed earlier than arm's elf. Because csky
doesn't give _PAGE_ACCESSED for default pgprot and in zap_pte_range

if (pte_young(ptent) &&
    likely(!(vma->vm_flags & VM_SEQ_READ)))
        mark_page_accessed(page);

mark_page_accessed will put the pages into active lru list.

[    3.652722] delete busybox page from inactive file list
Call Trace:
[<9012a376>] dump_stack+0xe/0x24
[<9012a370>] dump_stack+0x8/0x24
[<9005b780>] activate_page+0x2b4/0x2d4
[<90132502>] vsnprintf+0x2c6/0x374
[<9005b880>] mark_page_accessed+0xe0/0x150
[<9006903e>] unmap_page_range+0x166/0x33c
[<90021844>] get_signal+0x98/0x3b4
[<90069232>] unmap_single_vma+0x1e/0x24
[<90069462>] unmap_vmas+0x26/0x40
[<9006d3d8>] exit_mmap+0x60/0xbc
[<9006a140>] handle_mm_fault+0x700/0xcec
[<900426b2>] ktime_get_with_offset+0x86/0x130
[<90017566>] mmput+0x2e/0x90
[<9001a30a>] do_exit+0x13e/0x6f0
[<90015448>] page_fault_end+0x14/0x74
[<9001b4bc>] SyS_exit_group+0x0/0xc
[<9001b47c>] do_group_exit+0x2c/0x6c
[<9001b4c8>] __wake_up_parent+0x0/0x20
[<9001399e>] csky_systemcall+0x6e/0x72

csky will throw the pages at first and keep them in active lru
list later after real accessed, but arm would keep them in active
lru list at the beginning.

The following are statistics of different architecture styles:

Default _PAGE_ACCESSED: alpha, arm, arm64, ia64, m68k, microblaze,
			openrisc, powerpc, riscv, sh, um, x86,
			xtensa
Not def _PAGE_ACCESSED: arc, c6x, h8300, hexgon, mips, s390, nds32,
			nios2, parisc, sparc

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Co-developed-by: Xu Kai <xukai@nationalchip.com>
Signed-off-by: Xu Kai <xukai@nationalchip.com>

diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 2485db84dba873d522031ed2000bd84758f4f181..429d96f6662035973e10060285603c25a400eaa1 100644 (file)
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -63,18 +63,20 @@
  * read. Also, write permissions imply read permissions. This is the closest
  * we can get by reasonable means..
  */
-#define PAGE_NONE      __pgprot(_PAGE_PRESENT | _CACHE_CACHED)
-#define PAGE_SHARED    __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+#define _PAGE_BASE     (_PAGE_PRESENT | _PAGE_ACCESSED)
+
+#define PAGE_NONE      __pgprot(_PAGE_BASE | _CACHE_CACHED)
+#define PAGE_SHARED    __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
                                _CACHE_CACHED)
-#define PAGE_COPY      __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
-#define PAGE_READONLY  __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED)
-#define PAGE_KERNEL    __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
+#define PAGE_COPY      __pgprot(_PAGE_BASE | _PAGE_READ | _CACHE_CACHED)
+#define PAGE_READONLY  __pgprot(_PAGE_BASE | _PAGE_READ | _CACHE_CACHED)
+#define PAGE_KERNEL    __pgprot(_PAGE_BASE | __READABLE | __WRITEABLE | \
                                _PAGE_GLOBAL | _CACHE_CACHED)
-#define PAGE_USERIO    __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
+#define PAGE_USERIO    __pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE | \
                                _CACHE_CACHED)
 
 #define _PAGE_IOREMAP \
-       (_PAGE_PRESENT | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
+       (_PAGE_BASE | __READABLE | __WRITEABLE | _PAGE_GLOBAL | \
         _CACHE_UNCACHED | _PAGE_SO)
 
 #define __P000 PAGE_NONE