From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 2 Sep 2021 02:09:02 +0000 (+1000)
Subject: Merge remote-tracking branch 'kvm/next'
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9c22d282f51f151c72d6dfa144d056f774607a66;p=users%2Fjedix%2Flinux-maple.git

Merge remote-tracking branch 'kvm/next'
---

9c22d282f51f151c72d6dfa144d056f774607a66
diff --cc Documentation/virt/kvm/api.rst
index c6212c2d5fe3,4ea1bb28297b..a6729c8cf063
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@@ -5235,9 -5240,8 +5241,9 @@@ by this descriptor. Its endianness is C
  The following flags are supported:
  
  Bits 0-3 of ``flags`` encode the type:
 +
    * ``KVM_STATS_TYPE_CUMULATIVE``
-     The statistics data is cumulative. The value of data can only be increased.
+     The statistics reports a cumulative count. The value of data can only be increased.
      Most of the counters used in KVM are of this type.
      The corresponding ``size`` field for this type is always 1.
      All cumulative statistics data are read/write.
@@@ -5248,13 -5252,26 +5254,27 @@@
      All instant statistics are read only.
      The corresponding ``size`` field for this type is always 1.
    * ``KVM_STATS_TYPE_PEAK``
-     The statistics data is peak. The value of data can only be increased, and
-     represents a peak value for a measurement, for example the maximum number
+     The statistics data reports a peak value, for example the maximum number
      of items in a hash table bucket, the longest time waited and so on.
+     The value of data can only be increased.
      The corresponding ``size`` field for this type is always 1.
+   * ``KVM_STATS_TYPE_LINEAR_HIST``
+     The statistic is reported as a linear histogram. The number of
+     buckets is specified by the ``size`` field. The size of buckets is specified
+     by the ``hist_param`` field. The range of the Nth bucket (1 <= N < ``size``)
+     is [``hist_param``*(N-1), ``hist_param``*N), while the range of the last
+     bucket is [``hist_param``*(``size``-1), +INF). (+INF means positive infinity
+     value.) The bucket value indicates how many samples fell in the bucket's range.
+   * ``KVM_STATS_TYPE_LOG_HIST``
+     The statistic is reported as a logarithmic histogram. The number of
+     buckets is specified by the ``size`` field. The range of the first bucket is
+     [0, 1), while the range of the last bucket is [pow(2, ``size``-2), +INF).
+     Otherwise, The Nth bucket (1 < N < ``size``) covers
+     [pow(2, N-2), pow(2, N-1)). The bucket value indicates how many samples fell
+     in the bucket's range.
  
  Bits 4-7 of ``flags`` encode the unit:
 +
    * ``KVM_STATS_UNIT_NONE``
      There is no unit for the value of statistics data. This usually means that
      the value is a simple counter of an event.