summaryrefslogtreecommitdiff
path: root/arch/csky
diff options
context:
space:
mode:
authorGuo Ren <guoren@linux.alibaba.com>2021-01-11 15:16:28 +0300
committerGuo Ren <guoren@linux.alibaba.com>2021-01-12 06:08:25 +0300
commit5e144c42ee683a771b96239f76d44243a4632094 (patch)
treededfeaf41a4346e8e1eb85d8137ad81cea7769f1 /arch/csky
parentf1f61c971aa639f37eb2ddd917a5e3effc3fdcd3 (diff)
downloadlinux-5e144c42ee683a771b96239f76d44243a4632094.tar.xz
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>
Diffstat (limited to 'arch/csky')
-rw-r--r--arch/csky/include/asm/pgtable.h16
1 files changed, 9 insertions, 7 deletions
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 2485db84dba8..429d96f66620 100644
--- 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