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Tony Luck fc6daaf931 mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute ... Some high end Intel Xeon systems report uncorrectable memory errors as a recoverable machine check. Linux has included code for some time to process these and just signal the affected processes (or even recover completely if the error was in a read only page that can be replaced by reading from disk). But we have no recovery path for errors encountered during kernel code execution. Except for some very specific cases were are unlikely to ever be able to recover. Enter memory mirroring. Actually 3rd generation of memory mirroing. Gen1: All memory is mirrored Pro: No s/w enabling - h/w just gets good data from other side of the mirror Con: Halves effective memory capacity available to OS/applications Gen2: Partial memory mirror - just mirror memory begind some memory controllers Pro: Keep more of the capacity Con: Nightmare to enable. Have to choose between allocating from mirrored memory for safety vs. NUMA local memory for performance Gen3: Address range partial memory mirror - some mirror on each memory controller Pro: Can tune the amount of mirror and keep NUMA performance Con: I have to write memory management code to implement The current plan is just to use mirrored memory for kernel allocations. This has been broken into two phases: 1) This patch series - find the mirrored memory, use it for boot time allocations 2) Wade into mm/page_alloc.c and define a ZONE_MIRROR to pick up the unused mirrored memory from mm/memblock.c and only give it out to select kernel allocations (this is still being scoped because page_alloc.c is scary). This patch (of 3): Add extra "flags" to memblock to allow selection of memory based on attribute. No functional changes Signed-off-by: Tony Luck <tony.luck@intel.com> Cc: Xishi Qiu <qiuxishi@huawei.com> Cc: Hanjun Guo <guohanjun@huawei.com> Cc: Xiexiuqi <xiexiuqi@huawei.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		10 years ago
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kmemcheck	x86: Replace __get_cpu_var uses	11 years ago
Makefile	mm: move memtest under mm	10 years ago
amdtopology.c	x86/mm/numa: Simplify some bit mangling	12 years ago
dump_pagetables.c	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	10 years ago
extable.c	…
fault.c	mm/fault, arch: Use pagefault_disable() to check for disabled pagefaults in the handler	10 years ago
gup.c	mm: convert p[te|md]_numa users to p[te|md]_protnone_numa	10 years ago
highmem_32.c	sched/preempt, mm/kmap: Explicitly disable/enable preemption in kmap_atomic_*	10 years ago
hugetlbpage.c	mm/hugetlb: pmd_huge() returns true for non-present hugepage	10 years ago
init.c	x86/mm/pat: Emulate PAT when it is disabled	10 years ago
init_32.c	mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute	10 years ago
init_64.c	x86/mm: Use early_param_on_off() for direct_gbpages	10 years ago
iomap_32.c	Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	10 years ago
ioremap.c	Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	10 years ago
kasan_init_64.c	kasan: enable instrumentation of global variables	10 years ago
kmmio.c	x86: Delete non-required instances of include <linux/init.h>	11 years ago
mm_internal.h	x86: Enable PAT to use cache mode translation tables	10 years ago
mmap.c	mm: expose arch_mmap_rnd when available	10 years ago
mmio-mod.c	x86: delete __cpuinit usage from all x86 files	12 years ago
mpx.c	x86/mpx: Allow 32-bit binaries on 64-bit kernels again	10 years ago
numa.c	x86/mm/numa: Fix kernel stack corruption in numa_init()->numa_clear_kernel_node_hotplug()	10 years ago
numa_32.c	x86: Fix the initialization of physnode_map	11 years ago
numa_64.c	…
numa_emulation.c	x86: delete __cpuinit usage from all x86 files	12 years ago
numa_internal.h	x86-32, mm: Rip out x86_32 NUMA remapping code	12 years ago
pageattr-test.c	x86/mm: Decouple <linux/vmalloc.h> from <asm/io.h>	10 years ago
pageattr.c	x86/mm/pat: Add set_memory_wt() for Write-Through type	10 years ago
pat.c	x86/mm/pat: Extend set_page_memtype() to support Write-Through type	10 years ago
pat_internal.h	x86/mm/pat: Convert to pr_*() usage	10 years ago
pat_rbtree.c	x86/mm/pat: Convert to pr_*() usage	10 years ago
pf_in.c	…
pf_in.h	…
pgtable.c	x86/mm/mtrr: Enhance MTRR checks in kernel mapping helpers	10 years ago
pgtable_32.c	x86: Remove set_pmd_pfn	11 years ago
physaddr.c	x86, mm: Make DEBUG_VIRTUAL work earlier in boot	12 years ago
physaddr.h	…
setup_nx.c	x86: delete __cpuinit usage from all x86 files	12 years ago
srat.c	x86/mm: Avoid duplicated pxm_to_node() calls	11 years ago
testmmiotrace.c	…
tlb.c	x86: Store a per-cpu shadow copy of CR4	10 years ago