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Add binary stats capability text which is missing during merge of the binary stats patch. Signed-off-by: Jing Zhang --- Documentation/virt/kvm/api.rst | 36 +++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 3b6e3b1628b4..948d33c26704 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -5171,6 +5171,9 @@ by a string of size ``name_size``. #define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT) #define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT) #define KVM_STATS_TYPE_PEAK (0x2 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_LINEAR_HIST (0x3 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_LOG_HIST (0x4 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_LOG_HIST #define KVM_STATS_UNIT_SHIFT 4 #define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT) @@ -5178,11 +5181,13 @@ by a string of size ``name_size``. #define KVM_STATS_UNIT_BYTES (0x1 << KVM_STATS_UNIT_SHIFT) #define KVM_STATS_UNIT_SECONDS (0x2 << KVM_STATS_UNIT_SHIFT) #define KVM_STATS_UNIT_CYCLES (0x3 << KVM_STATS_UNIT_SHIFT) + #define KVM_STATS_UNIT_MAX KVM_STATS_UNIT_CYCLES #define KVM_STATS_BASE_SHIFT 8 #define KVM_STATS_BASE_MASK (0xF << KVM_STATS_BASE_SHIFT) #define KVM_STATS_BASE_POW10 (0x0 << KVM_STATS_BASE_SHIFT) #define KVM_STATS_BASE_POW2 (0x1 << KVM_STATS_BASE_SHIFT) + #define KVM_STATS_BASE_MAX KVM_STATS_BASE_POW2 struct kvm_stats_desc { __u32 flags; @@ -5214,6 +5219,22 @@ Bits 0-3 of ``flags`` encode the type: represents a peak value for a measurement, for example the maximum number of items in a hash table bucket, the longest time waited and so on. The corresponding ``size`` field for this type is always 1. + * ``KVM_STATS_TYPE_LINEAR_HIST`` + The statistics data is in the form of 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 times the statistics data is in + the bucket's range. + * ``KVM_STATS_TYPE_LOG_HIST`` + The statistics data is in the form of logarithmic histogram. The number of + buckets is specified by the ``size`` field. The base of logarithm is + specified by the ``hist_param`` field. The range of the Nth bucket (1 < N < + ``size``) is [pow(``hist_param``, N-2), pow(``hist_param``, N-1)). The range + of the first bucket is [0, 1), while the range of the last bucket is + [pow(``hist_param``, ``size``-2), +INF). The bucket value indicates how many + times the statistics data is in the bucket's range. Bits 4-7 of ``flags`` encode the unit: * ``KVM_STATS_UNIT_NONE`` @@ -5246,9 +5267,10 @@ unsigned 64bit data. The ``offset`` field is the offset from the start of Data Block to the start of the corresponding statistics data. -The ``unused`` field is reserved for future support for other types of -statistics data, like log/linear histogram. Its value is always 0 for the types -defined above. +The ``hist_param`` field is used as a parameter for histogram statistics data. +For linear histogram statistics data, it indicates the size of a bucket. For +logarithmic histogram statistics data, it indicates the base of the logarithm. +Only base of 2 is supported fo logarithmic histogram. The ``name`` field is the name string of the statistics data. The name string starts at the end of ``struct kvm_stats_desc``. The maximum length including @@ -7182,3 +7204,11 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace the hypercalls whose corresponding bit is in the argument, and return ENOSYS for the others. + +8.35 KVM_CAP_STATS_BINARY_FD +---------------------------- + +:Architectures: all + +This capability indicates the feature that userspace can get a file descriptor +for every VM and VCPU to read statistics data in binary format. -- 2.32.0.93.g670b81a890-goog From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jing Zhang Date: Tue, 06 Jul 2021 18:03:48 +0000 Subject: [PATCH v1 2/4] KVM: stats: Update doc for histogram statistics Message-Id: <20210706180350.2838127-3-jingzhangos@google.com> List-Id: References: <20210706180350.2838127-1-jingzhangos@google.com> In-Reply-To: <20210706180350.2838127-1-jingzhangos@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: KVM , KVMPPC , Paolo Bonzini , Sean Christopherson , Jim Mattson , Peter Shier , Oliver Upton , David Rientjes , David Matlack Cc: Jing Zhang Add documentations for linear and logarithmic histogram statistics. Add binary stats capability text which is missing during merge of the binary stats patch. Signed-off-by: Jing Zhang --- Documentation/virt/kvm/api.rst | 36 +++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index 3b6e3b1628b4..948d33c26704 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -5171,6 +5171,9 @@ by a string of size ``name_size``. #define KVM_STATS_TYPE_CUMULATIVE (0x0 << KVM_STATS_TYPE_SHIFT) #define KVM_STATS_TYPE_INSTANT (0x1 << KVM_STATS_TYPE_SHIFT) #define KVM_STATS_TYPE_PEAK (0x2 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_LINEAR_HIST (0x3 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_LOG_HIST (0x4 << KVM_STATS_TYPE_SHIFT) + #define KVM_STATS_TYPE_MAX KVM_STATS_TYPE_LOG_HIST #define KVM_STATS_UNIT_SHIFT 4 #define KVM_STATS_UNIT_MASK (0xF << KVM_STATS_UNIT_SHIFT) @@ -5178,11 +5181,13 @@ by a string of size ``name_size``. #define KVM_STATS_UNIT_BYTES (0x1 << KVM_STATS_UNIT_SHIFT) #define KVM_STATS_UNIT_SECONDS (0x2 << KVM_STATS_UNIT_SHIFT) #define KVM_STATS_UNIT_CYCLES (0x3 << KVM_STATS_UNIT_SHIFT) + #define KVM_STATS_UNIT_MAX KVM_STATS_UNIT_CYCLES #define KVM_STATS_BASE_SHIFT 8 #define KVM_STATS_BASE_MASK (0xF << KVM_STATS_BASE_SHIFT) #define KVM_STATS_BASE_POW10 (0x0 << KVM_STATS_BASE_SHIFT) #define KVM_STATS_BASE_POW2 (0x1 << KVM_STATS_BASE_SHIFT) + #define KVM_STATS_BASE_MAX KVM_STATS_BASE_POW2 struct kvm_stats_desc { __u32 flags; @@ -5214,6 +5219,22 @@ Bits 0-3 of ``flags`` encode the type: represents a peak value for a measurement, for example the maximum number of items in a hash table bucket, the longest time waited and so on. The corresponding ``size`` field for this type is always 1. + * ``KVM_STATS_TYPE_LINEAR_HIST`` + The statistics data is in the form of 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 times the statistics data is in + the bucket's range. + * ``KVM_STATS_TYPE_LOG_HIST`` + The statistics data is in the form of logarithmic histogram. The number of + buckets is specified by the ``size`` field. The base of logarithm is + specified by the ``hist_param`` field. The range of the Nth bucket (1 < N < + ``size``) is [pow(``hist_param``, N-2), pow(``hist_param``, N-1)). The range + of the first bucket is [0, 1), while the range of the last bucket is + [pow(``hist_param``, ``size``-2), +INF). The bucket value indicates how many + times the statistics data is in the bucket's range. Bits 4-7 of ``flags`` encode the unit: * ``KVM_STATS_UNIT_NONE`` @@ -5246,9 +5267,10 @@ unsigned 64bit data. The ``offset`` field is the offset from the start of Data Block to the start of the corresponding statistics data. -The ``unused`` field is reserved for future support for other types of -statistics data, like log/linear histogram. Its value is always 0 for the types -defined above. +The ``hist_param`` field is used as a parameter for histogram statistics data. +For linear histogram statistics data, it indicates the size of a bucket. For +logarithmic histogram statistics data, it indicates the base of the logarithm. +Only base of 2 is supported fo logarithmic histogram. The ``name`` field is the name string of the statistics data. The name string starts at the end of ``struct kvm_stats_desc``. The maximum length including @@ -7182,3 +7204,11 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace the hypercalls whose corresponding bit is in the argument, and return ENOSYS for the others. + +8.35 KVM_CAP_STATS_BINARY_FD +---------------------------- + +:Architectures: all + +This capability indicates the feature that userspace can get a file descriptor +for every VM and VCPU to read statistics data in binary format. -- 2.32.0.93.g670b81a890-goog