Re: [PATCH v4 0/4] KVM statistics data fd-based binary interface

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 10/05/21 20:57, Jing Zhang wrote:
Hi Paolo,

On Thu, Apr 29, 2021 at 3:37 PM Jing Zhang <jingzhangos@xxxxxxxxxx> wrote:

This patchset provides a file descriptor for every VM and VCPU to read
KVM statistics data in binary format.
It is meant to provide a lightweight, flexible, scalable and efficient
lock-free solution for user space telemetry applications to pull the
statistics data periodically for large scale systems. The pulling
frequency could be as high as a few times per second.
In this patchset, every statistics data are treated to have some
attributes as below:
   * architecture dependent or common
   * VM statistics data or VCPU statistics data
   * type: cumulative, instantaneous,
   * unit: none for simple counter, nanosecond, microsecond,
     millisecond, second, Byte, KiByte, MiByte, GiByte. Clock Cycles
Since no lock/synchronization is used, the consistency between all
the statistics data is not guaranteed. That means not all statistics
data are read out at the exact same time, since the statistics date
are still being updated by KVM subsystems while they are read out.

---

* v3 -> v4
   - Rebase to kvm/queue, commit 9f242010c3b4 ("KVM: avoid "deadlock"
     between install_new_memslots and MMU notifier")
   - Use C-stype comments in the whole patch
   - Fix wrong count for x86 VCPU stats descriptors
   - Fix KVM stats data size counting and validity check in selftest

* v2 -> v3
   - Rebase to kvm/queue, commit edf408f5257b ("KVM: avoid "deadlock"
     between install_new_memslots and MMU notifier")
   - Resolve some nitpicks about format

* v1 -> v2
   - Use ARRAY_SIZE to count the number of stats descriptors
   - Fix missing `size` field initialization in macro STATS_DESC

[1] https://lore.kernel.org/kvm/20210402224359.2297157-1-jingzhangos@xxxxxxxxxx
[2] https://lore.kernel.org/kvm/20210415151741.1607806-1-jingzhangos@xxxxxxxxxx
[3] https://lore.kernel.org/kvm/20210423181727.596466-1-jingzhangos@xxxxxxxxxx

---

Jing Zhang (4):
   KVM: stats: Separate common stats from architecture specific ones
   KVM: stats: Add fd-based API to read binary stats data
   KVM: stats: Add documentation for statistics data binary interface
   KVM: selftests: Add selftest for KVM statistics data binary interface

  Documentation/virt/kvm/api.rst                | 171 ++++++++
  arch/arm64/include/asm/kvm_host.h             |   9 +-
  arch/arm64/kvm/guest.c                        |  42 +-
  arch/mips/include/asm/kvm_host.h              |   9 +-
  arch/mips/kvm/mips.c                          |  67 ++-
  arch/powerpc/include/asm/kvm_host.h           |   9 +-
  arch/powerpc/kvm/book3s.c                     |  68 +++-
  arch/powerpc/kvm/book3s_hv.c                  |  12 +-
  arch/powerpc/kvm/book3s_pr.c                  |   2 +-
  arch/powerpc/kvm/book3s_pr_papr.c             |   2 +-
  arch/powerpc/kvm/booke.c                      |  63 ++-
  arch/s390/include/asm/kvm_host.h              |   9 +-
  arch/s390/kvm/kvm-s390.c                      | 133 +++++-
  arch/x86/include/asm/kvm_host.h               |   9 +-
  arch/x86/kvm/x86.c                            |  71 +++-
  include/linux/kvm_host.h                      | 132 +++++-
  include/linux/kvm_types.h                     |  12 +
  include/uapi/linux/kvm.h                      |  50 +++
  tools/testing/selftests/kvm/.gitignore        |   1 +
  tools/testing/selftests/kvm/Makefile          |   3 +
  .../testing/selftests/kvm/include/kvm_util.h  |   3 +
  .../selftests/kvm/kvm_bin_form_stats.c        | 380 ++++++++++++++++++
  tools/testing/selftests/kvm/lib/kvm_util.c    |  11 +
  virt/kvm/kvm_main.c                           | 237 ++++++++++-
  24 files changed, 1415 insertions(+), 90 deletions(-)
  create mode 100644 tools/testing/selftests/kvm/kvm_bin_form_stats.c


base-commit: 9f242010c3b46e63bc62f08fff42cef992d3801b
--
2.31.1.527.g47e6f16901-goog


Do I need to send another version for this?

No, the merge window has just finished and I wanted to flush the dozens of bugfix patches that I had. I'll get to it shortly.

Paolo




[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux