Mel Gorman
29c7787075
mm: use paravirt friendly ops for NUMA hinting ptes ...
David Vrabel identified a regression when using automatic NUMA balancing
under Xen whereby page table entries were getting corrupted due to the
use of native PTE operations. Quoting him
Xen PV guest page tables require that their entries use machine
addresses if the preset bit (_PAGE_PRESENT) is set, and (for
successful migration) non-present PTEs must use pseudo-physical
addresses. This is because on migration MFNs in present PTEs are
translated to PFNs (canonicalised) so they may be translated back
to the new MFN in the destination domain (uncanonicalised).
pte_mknonnuma(), pmd_mknonnuma(), pte_mknuma() and pmd_mknuma()
set and clear the _PAGE_PRESENT bit using pte_set_flags(),
pte_clear_flags(), etc.
In a Xen PV guest, these functions must translate MFNs to PFNs
when clearing _PAGE_PRESENT and translate PFNs to MFNs when setting
_PAGE_PRESENT.
His suggested fix converted p[te|md]_[set|clear]_flags to using
paravirt-friendly ops but this is overkill. He suggested an alternative
of using p[te|md]_modify in the NUMA page table operations but this is
does more work than necessary and would require looking up a VMA for
protections.
This patch modifies the NUMA page table operations to use paravirt
friendly operations to set/clear the flags of interest. Unfortunately
this will take a performance hit when updating the PTEs on
CONFIG_PARAVIRT but I do not see a way around it that does not break
Xen.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Tested-by: David Vrabel <david.vrabel@citrix.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Anvin <hpa@zytor.com>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Steven Noonan <steven@uplinklabs.net>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-18 16:40:09 -07:00
bitops: Fix signedness of compile-time hweight implementations
2014-02-09 13:39:26 +01:00
asm-generic: move cmpxchg*_local defs to cmpxchg.h
2013-03-13 06:11:05 +01:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
audit: Modify a set of system calls in audit class definitions
2014-01-17 17:01:46 -05:00
arch: Introduce smp_load_acquire(), smp_store_release()
2014-01-12 10:37:17 +01:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
bug: Make BUG() always stop the machine
2014-04-07 16:36:10 -07:00
asm-generic headers: Allow yet more arch overrides in checksum.h
2013-02-11 20:00:33 +05:30
asm-generic: Add default clkdev.h
2012-10-03 21:33:53 +02:00
LLVMLinux: Remove warning about returning an uninitialized variable
2014-04-09 13:44:35 -07:00
asm-generic: move cmpxchg*_local defs to cmpxchg.h
2013-03-13 06:11:05 +01:00
cputime: Generic on-demand virtual cputime accounting
2013-01-27 19:23:27 +01:00
cputime: Bring cputime -> nsecs conversion
2014-03-13 15:56:44 +01:00
cputime: Bring cputime -> nsecs conversion
2014-03-13 15:56:44 +01:00
common: dma-mapping: add support for generic dma_mmap_* calls
2012-07-30 12:25:46 +02:00
asm-generic/dma-mapping-broken.h: Provide dma_alloc_attrs()/dma_free_attrs()
2012-12-25 20:14:54 +01:00
common: dma-mapping: introduce dma_get_sgtable() function
2012-07-30 12:25:46 +02:00
mm: create generic early_ioremap() support
2014-04-07 16:36:15 -07:00
Split arch_align_stack() out from asm-generic/system.h
2012-03-28 18:30:03 +01:00
add generic fixmap.h
2014-01-23 16:36:54 -08:00
bitops: Add missing parentheses to new get_order macro
2012-02-24 10:39:27 -08:00
gpio: make gpiod_direction_output take a logical value
2014-02-07 09:47:02 +01:00
lib: hash: follow-up fixups for arch hash
2013-12-19 00:14:53 -05:00
mm: Fix generic hugetlb pte check return type.
2013-10-02 20:02:35 -04:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
asm-generic: architecture independent readq/writeq for 32bit environment
2012-02-21 16:47:28 -08:00
asm-generic: architecture independent readq/writeq for 32bit environment
2012-02-21 16:47:28 -08:00
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
Kconfig: rename HAS_IOPORT to HAS_IOPORT_MAP
2014-04-07 16:36:11 -07:00
UAPI: Set up uapi/asm/Kbuild.asm
2012-10-02 18:01:56 +01:00
asm-generic: remove km_type definitions
2012-07-24 15:27:30 +08:00
KVM: add kvm_para_available to asm-generic/kvm_para.h
2013-06-05 13:21:29 +03:00
locking/mcs: Allow architecture specific asm files to be used for contended case
2014-02-09 21:18:52 +01:00
__page_to_pfn: Fix typo in comment
2013-10-14 15:28:29 +02:00
asm-generic/mmu.h: Add support for FDPIC
2012-12-09 23:14:14 +01:00
Make most arch asm/module.h files use asm-generic/module.h
2012-09-28 14:31:03 +09:30
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
arch: Make __mutex_fastpath_lock_retval return whether fastpath succeeded or not
2013-06-26 12:10:55 +02:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
include: remove __dev* attributes.
2013-01-03 15:57:16 -08:00
PCI: work around Stratus ftServer broken PCIe hierarchy
2012-04-30 15:21:02 -06:00
PCI: collapse pcibios_resource_to_bus
2012-02-23 20:19:04 -07:00
[PARISC] fix compile break caused by iomap: make IOPORT/PCI mapping functions conditional
2012-02-27 09:43:30 -06:00
percpu: add raw_cpu_ops
2014-04-07 16:36:13 -07:00
mm: use paravirt friendly ops for NUMA hinting ptes
2014-04-18 16:40:09 -07:00
sched: Remove PREEMPT_NEED_RESCHED from generic code
2013-12-11 15:52:32 +01:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
asm-generic: rwsem: de-PPCify rwsem.h
2014-03-14 18:02:08 +00:00
vmlinux.lds: add comments for global variables and clean up useless declarations
2013-07-03 16:07:34 -07:00
constify copy_siginfo_to_user{,32}()
2013-11-09 00:16:29 -05:00
unify default ptrace_signal_deliver
2012-11-29 00:01:23 -05:00
crypto: create generic version of ablk_helper
2013-09-24 06:02:24 +10:00
ARM: 7430/1: sizes.h: move from asm-generic to <linux/sizes.h>
2012-06-28 17:14:34 +01:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
Split the switch_to() wrapper out of asm-generic/system.h
2012-03-28 18:30:03 +01:00
syscall_get_arch: remove useless function arguments
2014-03-20 10:11:59 -04:00
burying unused conditionals
2013-02-14 09:21:15 -05:00
UAPI: (Scripted) Disintegrate include/asm-generic
2012-10-04 18:20:15 +01:00
Fix TLB gather virtual address range invalidation corner cases
2013-08-16 08:52:46 -07:00
BUG: headers with BUG/BUG_ON etc. need linux/bug.h
2012-03-04 17:54:34 -05:00
tracing,x86: Add a TSC trace_clock
2012-11-13 15:48:27 -05:00
asm-generic: uaccess: Spelling s/a ny/any/
2014-01-02 10:45:23 +01:00
We get rid of the general module prefix confusion with a binary config option,
2013-05-05 10:58:06 -07:00
ARM: SoC specific changes
2014-04-05 14:19:54 -07:00
include/asm-generic/vtime.h: avoid zero-length file
2013-09-30 14:31:02 -07:00
word-at-a-time: provide generic big-endian zero_bytemask implementation
2013-12-12 10:39:01 -08:00
asm-generic: xor: mark static functions as __maybe_unused
2012-10-03 21:21:06 +02:00
29c7787075