This patch set is to enable histograms and (partially) TUI mode in perf
kvm tool.

Patch set v1 [1] gives brief introduction for the change and this series
has a minor update for the patch 13 'perf kvm: Add TUI mode for stat
report' to avoid building failure when the system doesn't support
HAVE_SLANG_SUPPORT.

We can use below commands for testing this series:

In a terminal, you could launch a virtual machine with qemu command; in
below case, I downloaded a Ubuntu (or Debian) iso file and used it as
the file system image:

  $ qemu-system-x86_64 -M pc -enable-kvm -cpu host -m 4096 -hda ubuntu-22.04-desktop-amd64.iso

Then in another terminal, I can use below command to capture KVM trace
data and report the result:

  # cd linux/tools/perf
  # ./perf kvm stat record
  # ./perf kvm stat report          => Output in TUI mode
  # ./perf kvm stat report --stdio  => Output in stdio mode

Changes from v1:
* Updated the patch 13 'perf kvm: Add TUI mode for stat report' to avoid
  building failure if no support HAVE_SLANG_SUPPORT.

[1] https://lore.kernel.org/lkml/20230226042053.1492409-1-leo.yan@linaro.org/


Leo Yan (14):
  perf kvm: Refactor overall statistics
  perf kvm: Add pointer to 'perf_kvm_stat' in kvm event
  perf kvm: Move up metrics helpers
  perf kvm: Use subtraction for comparison metrics
  perf kvm: Introduce histograms data structures
  perf kvm: Pass argument 'sample' to kvm_alloc_init_event()
  perf kvm: Parse address location for samples
  perf kvm: Add dimensions for KVM event statistics
  perf kvm: Use histograms list to replace cached list
  perf kvm: Polish sorting key
  perf kvm: Support printing attributions for dimensions
  perf kvm: Add dimensions for percentages
  perf kvm: Add TUI mode for stat report
  perf kvm: Update documentation to reflect new changes

 tools/perf/Documentation/perf-kvm.txt |   9 +-
 tools/perf/builtin-kvm.c              | 856 +++++++++++++++++++++-----
 tools/perf/util/kvm-stat.h            |  26 +-
 3 files changed, 716 insertions(+), 175 deletions(-)

-- 
2.34.1