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From: Andrew Morton <akpm@linux-foundation.org>
To: akpm@linux-foundation.org, ambrosehua@gmail.com,
	chenhc@lemote.com, christophe.leroy@csgroup.eu,
	gaojuxin@loongson.cn, huangpei@loongson.cn,
	jiaxun.yang@flygoat.com, linux-mm@kvack.org,
	lixuefeng@loongson.cn, maobibo@loongson.cn,
	mm-commits@vger.kernel.org, npiggin@gmail.com,
	paulburton@kernel.org, torvalds@linux-foundation.org,
	tsbogend@alpha.franken.de, yangtiezhu@loongson.cn,
	zhangfx@lemote.com
Subject: [patch 118/118] MIPS: make userspace mapping young by default
Date: Thu, 25 Feb 2021 17:22:49 -0800
Message-ID: <20210226012249.-qWuoqPYr%akpm@linux-foundation.org> (raw)
In-Reply-To: <20210225171452.713967e96554bb6a53e44a19@linux-foundation.org>

From: Huang Pei <huangpei@loongson.cn>
Subject: MIPS: make userspace mapping young by default

MIPS page fault path(except huge page) takes 3 exceptions (1 TLB Miss + 2
TLB Invalid), butthe second TLB Invalid exception is just triggered by
__update_tlb from do_page_fault writing tlb without _PAGE_VALID set.  With
this patch, user space mapping prot is made young by default (with both
_PAGE_VALID and _PAGE_YOUNG set), and it only take 1 TLB Miss + 1 TLB
Invalid exception

Remove pte_sw_mkyoung without polluting MM code and make page fault delay
of MIPS on par with other architecture

Link: https://lkml.kernel.org/r/20210204013942.8398-1-huangpei@loongson.cn
Signed-off-by: Huang Pei <huangpei@loongson.cn>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: <huangpei@loongson.cn>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: <ambrosehua@gmail.com>
Cc: Bibo Mao <maobibo@loongson.cn>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Li Xuefeng <lixuefeng@loongson.cn>
Cc: Yang Tiezhu <yangtiezhu@loongson.cn>
Cc: Gao Juxin <gaojuxin@loongson.cn>
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Huacai Chen <chenhc@lemote.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/mips/mm/cache.c    |   30 ++++++++++++++++--------------
 include/linux/pgtable.h |    8 --------
 mm/memory.c             |    4 ----
 3 files changed, 16 insertions(+), 26 deletions(-)

--- a/arch/mips/mm/cache.c~mips-make-userspace-mapping-young-by-default
+++ a/arch/mips/mm/cache.c
@@ -157,29 +157,31 @@ unsigned long _page_cachable_default;
 EXPORT_SYMBOL(_page_cachable_default);
 
 #define PM(p)	__pgprot(_page_cachable_default | (p))
+#define PVA(p)	PM(_PAGE_VALID | _PAGE_ACCESSED | (p))
 
 static inline void setup_protection_map(void)
 {
 	protection_map[0]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-	protection_map[1]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
-	protection_map[2]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-	protection_map[3]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
-	protection_map[4]  = PM(_PAGE_PRESENT);
-	protection_map[5]  = PM(_PAGE_PRESENT);
-	protection_map[6]  = PM(_PAGE_PRESENT);
-	protection_map[7]  = PM(_PAGE_PRESENT);
+	protection_map[1]  = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC);
+	protection_map[2]  = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
+	protection_map[3]  = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC);
+	protection_map[4]  = PVA(_PAGE_PRESENT);
+	protection_map[5]  = PVA(_PAGE_PRESENT);
+	protection_map[6]  = PVA(_PAGE_PRESENT);
+	protection_map[7]  = PVA(_PAGE_PRESENT);
 
 	protection_map[8]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_NO_READ);
-	protection_map[9]  = PM(_PAGE_PRESENT | _PAGE_NO_EXEC);
-	protection_map[10] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
+	protection_map[9]  = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC);
+	protection_map[10] = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE |
 				_PAGE_NO_READ);
-	protection_map[11] = PM(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
-	protection_map[12] = PM(_PAGE_PRESENT);
-	protection_map[13] = PM(_PAGE_PRESENT);
-	protection_map[14] = PM(_PAGE_PRESENT | _PAGE_WRITE);
-	protection_map[15] = PM(_PAGE_PRESENT | _PAGE_WRITE);
+	protection_map[11] = PVA(_PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE);
+	protection_map[12] = PVA(_PAGE_PRESENT);
+	protection_map[13] = PVA(_PAGE_PRESENT);
+	protection_map[14] = PVA(_PAGE_PRESENT);
+	protection_map[15] = PVA(_PAGE_PRESENT);
 }
 
+#undef _PVA
 #undef PM
 
 void cpu_cache_init(void)
--- a/include/linux/pgtable.h~mips-make-userspace-mapping-young-by-default
+++ a/include/linux/pgtable.h
@@ -432,14 +432,6 @@ static inline void ptep_set_wrprotect(st
  * To be differentiate with macro pte_mkyoung, this macro is used on platforms
  * where software maintains page access bit.
  */
-#ifndef pte_sw_mkyoung
-static inline pte_t pte_sw_mkyoung(pte_t pte)
-{
-	return pte;
-}
-#define pte_sw_mkyoung	pte_sw_mkyoung
-#endif
-
 #ifndef pte_savedwrite
 #define pte_savedwrite pte_write
 #endif
--- a/mm/memory.c~mips-make-userspace-mapping-young-by-default
+++ a/mm/memory.c
@@ -2902,7 +2902,6 @@ static vm_fault_t wp_page_copy(struct vm
 		}
 		flush_cache_page(vma, vmf->address, pte_pfn(vmf->orig_pte));
 		entry = mk_pte(new_page, vma->vm_page_prot);
-		entry = pte_sw_mkyoung(entry);
 		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
 
 		/*
@@ -3560,7 +3559,6 @@ static vm_fault_t do_anonymous_page(stru
 	__SetPageUptodate(page);
 
 	entry = mk_pte(page, vma->vm_page_prot);
-	entry = pte_sw_mkyoung(entry);
 	if (vma->vm_flags & VM_WRITE)
 		entry = pte_mkwrite(pte_mkdirty(entry));
 
@@ -3745,8 +3743,6 @@ void do_set_pte(struct vm_fault *vmf, st
 
 	if (prefault && arch_wants_old_prefaulted_pte())
 		entry = pte_mkold(entry);
-	else
-		entry = pte_sw_mkyoung(entry);
 
 	if (write)
 		entry = maybe_mkwrite(pte_mkdirty(entry), vma);
_


  parent reply index

Thread overview: 123+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26  1:14 incoming Andrew Morton
2021-02-26  1:15 ` [patch 001/118] mm: make pagecache tagged lookups return only head pages Andrew Morton
2021-02-26  1:15 ` [patch 002/118] mm/shmem: use pagevec_lookup in shmem_unlock_mapping Andrew Morton
2021-02-26  1:15 ` [patch 003/118] mm/swap: optimise get_shadow_from_swap_cache Andrew Morton
2021-02-26  1:15 ` [patch 004/118] mm: add FGP_ENTRY Andrew Morton
2021-02-26  1:15 ` [patch 005/118] mm/filemap: rename find_get_entry to mapping_get_entry Andrew Morton
2021-02-26  1:15 ` [patch 006/118] mm/filemap: add helper for finding pages Andrew Morton
2021-02-26  1:15 ` [patch 007/118] mm/filemap: add mapping_seek_hole_data Andrew Morton
2021-02-26  1:15 ` [patch 008/118] iomap: use mapping_seek_hole_data Andrew Morton
2021-02-26  1:15 ` [patch 009/118] mm: add and use find_lock_entries Andrew Morton
2021-02-26  1:16 ` [patch 010/118] mm: add an 'end' parameter to find_get_entries Andrew Morton
2021-02-26  1:16 ` [patch 011/118] mm: add an 'end' parameter to pagevec_lookup_entries Andrew Morton
2021-02-26  1:16 ` [patch 012/118] mm: remove nr_entries parameter from pagevec_lookup_entries Andrew Morton
2021-02-26  1:16 ` [patch 013/118] mm: pass pvec directly to find_get_entries Andrew Morton
2021-02-26  1:16 ` [patch 014/118] mm: remove pagevec_lookup_entries Andrew Morton
2021-02-26  1:16 ` [patch 015/118] mm,thp,shmem: limit shmem THP alloc gfp_mask Andrew Morton
2021-02-26  1:16 ` [patch 016/118] mm,thp,shm: limit gfp mask to no more than specified Andrew Morton
2021-02-26  1:16 ` [patch 017/118] mm,thp,shmem: make khugepaged obey tmpfs mount flags Andrew Morton
2021-02-26  1:16 ` [patch 018/118] mm,shmem,thp: limit shmem THP allocations to requested zones Andrew Morton
2021-02-26  1:16 ` [patch 019/118] mm: cma: allocate cma areas bottom-up Andrew Morton
2021-02-26  1:16 ` [patch 020/118] mm/cma: expose all pages to the buddy if activation of an area fails Andrew Morton
2021-02-26  1:16 ` [patch 021/118] mm/page_alloc: count CMA pages per zone and print them in /proc/zoneinfo Andrew Morton
2021-02-26  1:16 ` [patch 022/118] mm: cma: print region name on failure Andrew Morton
2021-02-26  1:16 ` [patch 023/118] mm: vmstat: fix NOHZ wakeups for node stat changes Andrew Morton
2021-02-26  1:16 ` [patch 024/118] mm: vmstat: add some comments on internal storage of byte items Andrew Morton
2021-02-26  1:16 ` [patch 025/118] mm/vmstat.c: erase latency in vmstat_shepherd Andrew Morton
2021-02-26  1:16 ` [patch 026/118] mm: move pfn_to_online_page() out of line Andrew Morton
2021-02-26  1:17 ` [patch 027/118] mm: teach pfn_to_online_page() to consider subsection validity Andrew Morton
2021-02-26  1:17 ` [patch 028/118] mm: teach pfn_to_online_page() about ZONE_DEVICE section collisions Andrew Morton
2021-02-26  1:17 ` [patch 029/118] mm: fix memory_failure() handling of dax-namespace metadata Andrew Morton
2021-02-26  1:17 ` [patch 030/118] mm/memory_hotplug: rename all existing 'memhp' into 'mhp' Andrew Morton
2021-02-26  1:17 ` [patch 031/118] mm/memory_hotplug: MEMHP_MERGE_RESOURCE -> MHP_MERGE_RESOURCE Andrew Morton
2021-02-26  1:17 ` [patch 032/118] mm/memory_hotplug: use helper function zone_end_pfn() to get end_pfn Andrew Morton
2021-02-26  1:17 ` [patch 033/118] drivers/base/memory: don't store phys_device in memory blocks Andrew Morton
2021-02-26  1:17 ` [patch 034/118] Documentation: sysfs/memory: clarify some memory block device properties Andrew Morton
2021-02-26  1:17 ` [patch 035/118] mm/memory_hotplug: prevalidate the address range being added with platform Andrew Morton
2021-02-26  1:17 ` [patch 036/118] arm64/mm: define arch_get_mappable_range() Andrew Morton
2021-02-26  1:17 ` [patch 037/118] s390/mm: " Andrew Morton
2021-02-26  1:17 ` [patch 038/118] virtio-mem: check against mhp_get_pluggable_range() which memory we can hotplug Andrew Morton
2021-02-26  1:17 ` [patch 039/118] mm/mlock: stop counting mlocked pages when none vma is found Andrew Morton
2021-02-26  1:17 ` [patch 040/118] mm/rmap: correct some obsolete comments of anon_vma Andrew Morton
2021-02-26  1:17 ` [patch 041/118] mm/rmap: remove unneeded semicolon in page_not_mapped() Andrew Morton
2021-02-26  1:17 ` [patch 042/118] mm/rmap: fix obsolete comment in __page_check_anon_rmap() Andrew Morton
2021-02-26  1:18 ` [patch 043/118] mm/rmap: use page_not_mapped in try_to_unmap() Andrew Morton
2021-02-26  1:18 ` [patch 044/118] mm/rmap: correct obsolete comment of page_get_anon_vma() Andrew Morton
2021-02-26  1:18 ` [patch 045/118] mm/rmap: fix potential pte_unmap on an not mapped pte Andrew Morton
2021-02-26  1:18 ` [patch 046/118] mm: zswap: clean up confusing comment Andrew Morton
2021-02-26  1:18 ` [patch 047/118] mm/zswap: add the flag can_sleep_mapped Andrew Morton
2021-02-26  1:18 ` [patch 048/118] mm: set the sleep_mapped to true for zbud and z3fold Andrew Morton
2021-02-26  1:18 ` [patch 049/118] mm/zsmalloc.c: convert to use kmem_cache_zalloc in cache_alloc_zspage() Andrew Morton
2021-02-26  1:18 ` [patch 050/118] zsmalloc: account the number of compacted pages correctly Andrew Morton
2021-02-26  1:18 ` [patch 051/118] mm/zsmalloc.c: use page_private() to access page->private Andrew Morton
2021-02-26  1:18 ` [patch 052/118] mm: page-flags.h: Typo fix (It -> If) Andrew Morton
2021-02-26  1:18 ` [patch 053/118] mm/dmapool: use might_alloc() Andrew Morton
2021-02-26  1:18 ` [patch 054/118] mm/backing-dev.c: " Andrew Morton
2021-02-26  1:18 ` [patch 055/118] mm/early_ioremap.c: use __func__ instead of function name Andrew Morton
2021-02-26  1:18 ` [patch 056/118] mm: add Kernel Electric-Fence infrastructure Andrew Morton
2021-02-26  1:18 ` [patch 057/118] x86, kfence: enable KFENCE for x86 Andrew Morton
2021-02-26  1:19 ` [patch 058/118] arm64, kfence: enable KFENCE for ARM64 Andrew Morton
2021-02-26  1:19 ` [patch 059/118] kfence: use pt_regs to generate stack trace on faults Andrew Morton
2021-02-26  1:19 ` [patch 060/118] mm, kfence: insert KFENCE hooks for SLAB Andrew Morton
2021-02-26  1:19 ` [patch 061/118] mm, kfence: insert KFENCE hooks for SLUB Andrew Morton
2021-02-26  1:19 ` [patch 062/118] kfence, kasan: make KFENCE compatible with KASAN Andrew Morton
2021-02-26  1:19 ` [patch 063/118] kfence, Documentation: add KFENCE documentation Andrew Morton
2021-02-26  1:19 ` [patch 064/118] kfence: add test suite Andrew Morton
2021-02-26  1:19 ` [patch 065/118] MAINTAINERS: add entry for KFENCE Andrew Morton
2021-02-26  1:19 ` [patch 066/118] kfence: report sensitive information based on no_hash_pointers Andrew Morton
2021-02-26  1:19 ` [patch 067/118] tracing: add error_report_end trace point Andrew Morton
2021-02-26 14:03   ` Steven Rostedt
2021-02-26  1:19 ` [patch 068/118] kfence: use error_report_end tracepoint Andrew Morton
2021-02-26  1:19 ` [patch 069/118] kasan: " Andrew Morton
2021-02-26  1:19 ` [patch 070/118] kasan, mm: don't save alloc stacks twice Andrew Morton
2021-02-26  1:19 ` [patch 071/118] kasan, mm: optimize kmalloc poisoning Andrew Morton
2021-02-26  1:20 ` [patch 072/118] kasan: optimize large " Andrew Morton
2021-02-26  1:20 ` [patch 073/118] kasan: clean up setting free info in kasan_slab_free Andrew Morton
2021-02-26  1:20 ` [patch 074/118] kasan: unify large kfree checks Andrew Morton
2021-02-26  1:20 ` [patch 075/118] kasan: rework krealloc tests Andrew Morton
2021-02-26  1:20 ` [patch 076/118] kasan, mm: fail krealloc on freed objects Andrew Morton
2021-02-26  1:20 ` [patch 077/118] kasan, mm: optimize krealloc poisoning Andrew Morton
2021-02-26  1:20 ` [patch 078/118] kasan: ensure poisoning size alignment Andrew Morton
2021-02-26  1:20 ` [patch 079/118] arm64: kasan: simplify and inline MTE functions Andrew Morton
2021-02-26  1:20 ` [patch 080/118] kasan: inline HW_TAGS helper functions Andrew Morton
2021-02-26  1:20 ` [patch 081/118] kasan: clarify that only first bug is reported in HW_TAGS Andrew Morton
2021-02-26  1:20 ` [patch 082/118] alpha: remove CONFIG_EXPERIMENTAL from defconfigs Andrew Morton
2021-02-26  1:20 ` [patch 083/118] proc/wchan: use printk format instead of lookup_symbol_name() Andrew Morton
2021-02-26  1:20 ` [patch 084/118] proc: use kvzalloc for our kernel buffer Andrew Morton
2021-02-26  1:20 ` [patch 085/118] sysctl.c: fix underflow value setting risk in vm_table Andrew Morton
2021-02-26  1:20 ` [patch 086/118] include/linux: remove repeated words Andrew Morton
2021-02-26  1:21 ` [patch 087/118] treewide: Miguel has moved Andrew Morton
2021-02-26  1:21 ` [patch 088/118] groups: use flexible-array member in struct group_info Andrew Morton
2021-02-26  1:21 ` [patch 089/118] groups: simplify struct group_info allocation Andrew Morton
2021-02-26  1:21 ` [patch 090/118] kernel: delete repeated words in comments Andrew Morton
2021-02-26  1:21 ` [patch 091/118] MAINTAINERS: add uapi directories to API/ABI section Andrew Morton
2021-02-27 19:18   ` Michael Kerrisk (man-pages)
2021-02-26  1:21 ` [patch 092/118] lib/genalloc.c: change return type to unsigned long for bitmap_set_ll Andrew Morton
2021-02-26  1:21 ` [patch 093/118] string.h: move fortified functions definitions in a dedicated header Andrew Morton
2021-02-26  1:21 ` [patch 094/118] lib: stackdepot: add support to configure STACK_HASH_SIZE Andrew Morton
2021-02-26  1:21 ` [patch 095/118] lib: stackdepot: add support to disable stack depot Andrew Morton
2021-02-26  1:21 ` [patch 096/118] lib: stackdepot: fix ignoring return value warning Andrew Morton
2021-02-26  1:21 ` [patch 097/118] lib/cmdline: remove an unneeded local variable in next_arg() Andrew Morton
2021-02-26  1:21 ` [patch 098/118] include/linux/bitops.h: spelling s/synomyn/synonym/ Andrew Morton
2021-02-26  1:21 ` [patch 099/118] checkpatch: improve blank line after declaration test Andrew Morton
2021-02-26  1:21 ` [patch 100/118] checkpatch: ignore warning designated initializers using NR_CPUS Andrew Morton
2021-02-26  1:21 ` [patch 101/118] checkpatch: trivial style fixes Andrew Morton
2021-02-26  1:21 ` [patch 102/118] checkpatch: prefer ftrace over function entry/exit printks Andrew Morton
2021-02-26  1:21 ` [patch 103/118] checkpatch: improve TYPECAST_INT_CONSTANT test message Andrew Morton
2021-02-26  1:21 ` [patch 104/118] checkpatch: add warning for avoiding .L prefix symbols in assembly files Andrew Morton
2021-02-26  1:22 ` [patch 105/118] checkpatch: add kmalloc_array_node to unnecessary OOM message check Andrew Morton
2021-02-26  1:22 ` [patch 106/118] checkpatch: don't warn about colon termination in linker scripts Andrew Morton
2021-02-26  1:22 ` [patch 107/118] checkpatch: do not apply "initialise globals to 0" check to BPF progs Andrew Morton
2021-02-26  1:22 ` [patch 108/118] init/version.c: remove Version_<LINUX_VERSION_CODE> symbol Andrew Morton
2021-02-26  1:22 ` [patch 109/118] init: clean up early_param_on_off() macro Andrew Morton
2021-02-26  1:22 ` [patch 110/118] init/Kconfig: fix a typo in CC_VERSION_TEXT help text Andrew Morton
2021-02-26  1:22 ` [patch 111/118] fs/coredump: use kmap_local_page() Andrew Morton
2021-02-26  1:22 ` [patch 112/118] seq_file: document how per-entry resources are managed Andrew Morton
2021-02-26  1:22 ` [patch 113/118] x86: fix seq_file iteration for pat/memtype.c Andrew Morton
2021-02-26  1:22 ` [patch 114/118] scripts/gdb: fix list_for_each Andrew Morton
2021-02-26  1:22 ` [patch 115/118] kgdb: fix to kill breakpoints on initmem after boot Andrew Morton
2021-02-26  1:22 ` [patch 116/118] ubsan: remove overflow checks Andrew Morton
2021-02-26  1:22 ` [patch 117/118] initramfs: panic with memory information Andrew Morton
2021-02-26  1:22 ` Andrew Morton [this message]
2021-02-26 17:55 ` incoming Linus Torvalds
2021-02-26 19:16   ` incoming Andrew Morton

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