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a364c014a2
The write-track is used externally only by the gpu/drm/i915 driver. Currently, it is always enabled, if a kernel has been compiled with this driver. Enabling the write-track mechanism adds a two-byte overhead per page across all memory slots. It isn't significant for regular VMs. However in gVisor, where the entire process virtual address space is mapped into the VM, even with a 39-bit address space, the overhead amounts to 256MB. Rework the write-tracking mechanism to enable it on-demand in kvm_page_track_register_notifier. Here is Sean's comment about the locking scheme: The only potential hiccup would be if taking slots_arch_lock would deadlock, but it should be impossible for slots_arch_lock to be taken in any other path that involves VFIO and/or KVMGT *and* can be coincident. Except for kvm_arch_destroy_vm() (which deletes KVM's internal memslots), slots_arch_lock is taken only through KVM ioctls(), and the caller of kvm_page_track_register_notifier() *must* hold a reference to the VM. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Sean Christopherson <seanjc@google.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Co-developed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Andrei Vagin <avagin@google.com> Link: https://lore.kernel.org/r/20240213192340.2023366-1-avagin@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.