1. 20 Dec, 2013 8 commits
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm · 46dd0835
      Linus Torvalds authored
      Pull KVM fixes from Paolo Bonzini:
       "The PPC folks had a large amount of changes queued for 3.13, and now
        they are fixing the bugs"
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
        KVM: PPC: Book3S HV: Don't drop low-order page address bits
        powerpc: book3s: kvm: Don't abuse host r2 in exit path
        powerpc/kvm/booke: Fix build break due to stack frame size warning
        KVM: PPC: Book3S: PR: Enable interrupts earlier
        KVM: PPC: Book3S: PR: Make svcpu -> vcpu store preempt savvy
        KVM: PPC: Book3S: PR: Export kvmppc_copy_to|from_svcpu
        KVM: PPC: Book3S: PR: Don't clobber our exit handler id
        powerpc: kvm: fix rare but potential deadlock scene
        KVM: PPC: Book3S HV: Take SRCU read lock around kvm_read_guest() call
        KVM: PPC: Book3S HV: Make tbacct_lock irq-safe
        KVM: PPC: Book3S HV: Refine barriers in guest entry/exit
        KVM: PPC: Book3S HV: Fix physical address calculations
      46dd0835
    • Kirill A. Shutemov's avatar
      mm: do not allocate page->ptl dynamically, if spinlock_t fits to long · 597d795a
      Kirill A. Shutemov authored
      In struct page we have enough space to fit long-size page->ptl there,
      but we use dynamically-allocated page->ptl if size(spinlock_t) is larger
      than sizeof(int).
      
      It hurts 64-bit architectures with CONFIG_GENERIC_LOCKBREAK, where
      sizeof(spinlock_t) == 8, but it easily fits into struct page.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarHugh Dickins <hughd@google.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      597d795a
    • Johannes Weiner's avatar
      mm: page_alloc: revert NUMA aspect of fair allocation policy · fff4068c
      Johannes Weiner authored
      Commit 81c0a2bb ("mm: page_alloc: fair zone allocator policy") meant
      to bring aging fairness among zones in system, but it was overzealous
      and badly regressed basic workloads on NUMA systems.
      
      Due to the way kswapd and page allocator interacts, we still want to
      make sure that all zones in any given node are used equally for all
      allocations to maximize memory utilization and prevent thrashing on the
      highest zone in the node.
      
      While the same principle applies to NUMA nodes - memory utilization is
      obviously improved by spreading allocations throughout all nodes -
      remote references can be costly and so many workloads prefer locality
      over memory utilization.  The original change assumed that
      zone_reclaim_mode would be a good enough predictor for that, but it
      turned out to be as indicative as a coin flip.
      
      Revert the NUMA aspect of the fairness until we can find a proper way to
      make it configurable and agree on a sane default.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
      Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
      Cc: <stable@kernel.org> # 3.12
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      fff4068c
    • Mel Gorman's avatar
      Revert "mm: page_alloc: exclude unreclaimable allocations from zone fairness policy" · 8798cee2
      Mel Gorman authored
      This reverts commit 73f038b8.  The NUMA behaviour of this patch is
      less than ideal.  An alternative approch is to interleave allocations
      only within local zones which is implemented in the next patch.
      
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8798cee2
    • Kirill A. Shutemov's avatar
      mm: Fix NULL pointer dereference in madvise(MADV_WILLNEED) support · ee53664b
      Kirill A. Shutemov authored
      Sasha Levin found a NULL pointer dereference that is due to a missing
      page table lock, which in turn is due to the pmd entry in question being
      a transparent huge-table entry.
      
      The code - introduced in commit 1998cc04 ("mm: make
      madvise(MADV_WILLNEED) support swap file prefetch") - correctly checks
      for this situation using pmd_none_or_trans_huge_or_clear_bad(), but it
      turns out that that function doesn't work correctly.
      
      pmd_none_or_trans_huge_or_clear_bad() expected that pmd_bad() would
      trigger if the transparent hugepage bit was set, but it doesn't do that
      if pmd_numa() is also set. Note that the NUMA bit only gets set on real
      NUMA machines, so people trying to reproduce this on most normal
      development systems would never actually trigger this.
      
      Fix it by removing the very subtle (and subtly incorrect) expectation,
      and instead just checking pmd_trans_huge() explicitly.
      Reported-by: default avatarSasha Levin <sasha.levin@oracle.com>
      Acked-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      [ Additionally remove the now stale test for pmd_trans_huge() inside the
        pmd_bad() case - Linus ]
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      ee53664b
    • Paolo Bonzini's avatar
      Merge tag 'signed-for-3.13' of git://github.com/agraf/linux-2.6 into kvm-master · 5e6d26cf
      Paolo Bonzini authored
      Patch queue for 3.13 - 2013-12-18
      
      This fixes some grave issues we've only found after 3.13-rc1:
      
        - Make the modularized HV/PR book3s kvm work well as modules
        - Fix some race conditions
        - Fix compilation with certain compilers (booke)
        - Fix THP for book3s_hv
        - Fix preemption for book3s_pr
      
      Alexander Graf (4):
            KVM: PPC: Book3S: PR: Don't clobber our exit handler id
            KVM: PPC: Book3S: PR: Export kvmppc_copy_to|from_svcpu
            KVM: PPC: Book3S: PR: Make svcpu -> vcpu store preempt savvy
            KVM: PPC: Book3S: PR: Enable interrupts earlier
      
      Aneesh Kumar K.V (1):
            powerpc: book3s: kvm: Don't abuse host r2 in exit path
      
      Paul Mackerras (5):
            KVM: PPC: Book3S HV: Fix physical address calculations
            KVM: PPC: Book3S HV: Refine barriers in guest entry/exit
            KVM: PPC: Book3S HV: Make tbacct_lock irq-safe
            KVM: PPC: Book3S HV: Take SRCU read lock around kvm_read_guest() call
            KVM: PPC: Book3S HV: Don't drop low-order page address bits
      
      Scott Wood (1):
            powerpc/kvm/booke: Fix build break due to stack frame size warning
      
      pingfan liu (1):
            powerpc: kvm: fix rare but potential deadlock scene
      5e6d26cf
    • Linus Torvalds's avatar
      Merge tag 'stable/for-linus-3.13-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip · 4203d0eb
      Linus Torvalds authored
      Pull Xen bugfixes from Konrad Rzeszutek Wilk:
       - Fix balloon driver for auto-translate guests (PVHVM, ARM) to not use
         scratch pages.
       - Fix block API header for ARM32 and ARM64 to have proper layout
       - On ARM when mapping guests, stick on PTE_SPECIAL
       - When using SWIOTLB under ARM, don't call swiotlb functions twice
       - When unmapping guests memory and if we fail, don't return pages which
         failed to be unmapped.
       - Grant driver was using the wrong address on ARM.
      
      * tag 'stable/for-linus-3.13-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
        xen/balloon: Seperate the auto-translate logic properly (v2)
        xen/block: Correctly define structures in public headers on ARM32 and ARM64
        arm: xen: foreign mapping PTEs are special.
        xen/arm64: do not call the swiotlb functions twice
        xen: privcmd: do not return pages which we have failed to unmap
        XEN: Grant table address, xen_hvm_resume_frames, is a phys_addr not a pfn
      4203d0eb
    • Linus Torvalds's avatar
      Merge tag 'trace-fixes-v3.13-rc2' of... · 5263f0a8
      Linus Torvalds authored
      Merge tag 'trace-fixes-v3.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
      
      Pull ftrace fix from Steven Rostedt:
       "This fixes a long standing bug in the ftrace profiler.  The problem is
        that the profiler only initializes the online CPUs, and not possible
        CPUs.  This causes issues if the user takes CPUs online or offline
        while the profiler is running.
      
        If we online a CPU after starting the profiler, we lose all the trace
        information on the CPU going online.
      
        If we offline a CPU after running a test and start a new test, it will
        not clear the old data from that CPU.
      
        This bug causes incorrect data to be reported to the user if they
        online or offline CPUs during the profiling"
      
      * tag 'trace-fixes-v3.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        ftrace: Initialize the ftrace profiler for each possible cpu
      5263f0a8
  2. 19 Dec, 2013 32 commits