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SubjectRe: [PATCH -v3 0/7] x86: Use BRK to pre mapping page table to make xen happy
On Sat, Nov 3, 2012 at 2:37 PM, H. Peter Anvin <> wrote:
> I am travelling at the moment... I hope to be able to look at it Sunday.
>>can you put for-x86-mm-test to tip for more testing?
>>or you want to rebase the whole patchset?


please check branch that is rebased on top of 3.7-rc4.

Stefano, Konrad,
please check them with xen parts, and give your acked-by or
Reviewed-by accordingly.



From 1b66ccf15ff4bd0200567e8d70446a8763f96ee7 Mon Sep 17 00:00:00 2001
From: Yinghai Lu <>
Date: Mon, 5 Nov 2012 11:54:12 -0800
Subject: [PATCH v6 00/42] x86, mm: map ram from top-down with BRK and memblock.

rebase patchset together tip/x86/mm2 on top of linus v3.7-rc4

so this one include patchset : x86, mm: init_memory_mapping cleanup
in tip/x86/mm2
Current kernel init memory mapping between [0, TOML) and [4G, TOMH)
Some AMD systems have mem hole between 4G and TOMH, around 1T.
According to HPA, we should only mapping ram range.
1. Seperate calculate_table_space_size and find_early_page_table out with
2. For all ranges, will allocate page table one time
3. init mapping for ram range one by one.

pre mapping page table patcheset includes:
1. use brk to mapping first PMD_SIZE range under end of ram.
2. top down to initialize page table range by range.
3. get rid of calculate_page_table, and find_early_page_table.
4. remove early_ioremap in page table accessing.
5. remove workaround in xen to mark page RO.

v2: changes, update xen interface about pagetable_reserve, so not
use pgt_buf_* in xen code directly.
v3: use range top-down to initialize page table, so will not use
calculating/find early table anymore.
also reorder the patches sequence.
v4: add mapping_mark_page_ro to fix xen, also move pgt_buf_* to init.c
and merge alloc_low_page(), and for 32bit need to add alloc_low_pages
to fix 32bit kmap setting.
v5: remove mark_page_ro workaround and add another 5 cleanup patches.
v6: rebase on v3.7-rc4 and add 4 cleanup patches.

could be found at:

1b66ccf: mm: Kill NO_BOOTMEM version free_all_bootmem_node()
0332736: sparc, mm: Remove calling of free_all_bootmem_node()
0f88d27: x86, mm: kill numa_64.h
10c4c68: x86, mm: kill numa_free_all_bootmem()
0187d6e: x86, mm: Let "memmap=" take more entries one time
2c20fd0: x86, mm: Use clamp_t() in init_range_memory_mapping
770db30: x86, mm: Move after_bootmem to mm_internel.h
d9bd282: x86, mm: Unifying after_bootmem for 32bit and 64bit
003d654: x86, mm: use limit_pfn for end pfn
29f27b8: x86, mm: use pfn instead of pos in split_mem_range
8edaab8: x86, mm: use PFN_DOWN in split_mem_range()
e652c73: x86, mm: use round_up/down in split_mem_range()
5fd1391: x86, mm: Add check before clear pte above max_low_pfn on 32bit
f4fd136: x86, mm: Move function declaration into mm_internal.h
ea421df: x86, mm: change low/hignmem_pfn_init to static on 32bit
867525b: x86, mm: Move init_gbpages() out of setup.c
97fb23a: x86, mm: Move back pgt_buf_* to mm/init.c
ba55b2f: x86, mm: only call early_ioremap_page_table_range_init() once
bb6d2d9: x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages
6bc7e9f: x86, mm: Add alloc_low_pages(num)
d90df25: x86, mm, Xen: Remove mapping_pagetable_reserve()
f6699d2: x86, mm: Move min_pfn_mapped back to mm/init.c
675697b: x86, mm: Merge alloc_low_page between 64bit and 32bit
a14a382: x86, mm: Remove parameter in alloc_low_page for 64bit
a0d7a52: x86, mm: Remove early_memremap workaround for page table
accessing on 64bit
384a79d: x86, mm: setup page table in top-down
16252f2: x86, mm: Break down init_all_memory_mapping
255a0bf: x86, mm: Don't clear page table if range is ram
4bc70c5: x86, mm: Use big page size for small memory range
dc62aa8: x86, mm: Align start address to correct big page size
18f374c: x86: Only direct map addresses that are marked as E820_RAM
150387c: x86: Fixup code testing if a pfn is direct mapped
45cb049: x86: if kernel .text .data .bss are not marked as E820_RAM,
complain and fix
8d0b8bd: x86, mm: Set memblock initial limit to 1M
6c712cf: x86, mm: Separate out calculate_table_space_size()
33b0520: x86, mm: Find early page table buffer together
a95ff4b: x86, mm: Change find_early_table_space() paramters
ea564f8: x86, mm: Revert back good_end setting for 64bit
912c686: x86, mm: Move init_memory_mapping calling out of setup.c
47cfa63: x86, mm: Move down find_early_table_space()
060ed6c: x86, mm: Split out split_mem_range from init_memory_mapping
2ad38b5: x86, mm: Add global page_size_mask and probe one time only

arch/sparc/mm/init_64.c | 24 +-
arch/x86/include/asm/init.h | 21 +--
arch/x86/include/asm/numa.h | 2 -
arch/x86/include/asm/numa_64.h | 6 -
arch/x86/include/asm/page_types.h | 2 +
arch/x86/include/asm/pgtable.h | 2 +
arch/x86/include/asm/pgtable_types.h | 1 -
arch/x86/include/asm/x86_init.h | 12 -
arch/x86/kernel/acpi/boot.c | 1 -
arch/x86/kernel/cpu/amd.c | 9 +-
arch/x86/kernel/cpu/intel.c | 1 -
arch/x86/kernel/e820.c | 16 ++-
arch/x86/kernel/setup.c | 70 ++----
arch/x86/kernel/x86_init.c | 4 -
arch/x86/mm/init.c | 445 ++++++++++++++++++++++------------
arch/x86/mm/init_32.c | 106 +++++---
arch/x86/mm/init_64.c | 140 ++++-------
arch/x86/mm/mm_internal.h | 19 ++
arch/x86/mm/numa_64.c | 13 -
arch/x86/platform/efi/efi.c | 7 +-
arch/x86/xen/mmu.c | 28 ---
include/linux/mm.h | 1 -
mm/nobootmem.c | 14 -
23 files changed, 480 insertions(+), 464 deletions(-)
delete mode 100644 arch/x86/include/asm/numa_64.h
create mode 100644 arch/x86/mm/mm_internal.h


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